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Transmission's RPC specification

This document describes a protocol for interacting with Transmission sessions remotely.

1.1 Terminology

The JSON terminology in RFC 4627 is used. RPC requests and responses are formatted in JSON.

1.2 Tools

If transmission-remote is called with a --debug argument, its RPC traffic to the Transmission server will be dumped to the terminal. This can be useful when you want to compare requests in your application to another for reference.

If transmission-qt is run with an environment variable TR_RPC_VERBOSE set, it too will dump the RPC requests and responses to the terminal for inspection.

Lastly, using the browser's developer tools in the Transmission web client is always an option.

1.3 Libraries of ready-made wrappers

Some people outside of the Transmission project have written libraries that wrap this RPC API. These aren't supported by the Transmission project, but are listed here in the hope that they may be useful:

Language	Link
C#	https://www.nuget.org/packages/Transmission.API.RPC
Go	https://github.com/hekmon/transmissionrpc
Python	https://github.com/Trim21/transmission-rpc
Rust	https://crates.io/crates/transmission-rpc

2 Message format

Messages are formatted as objects. There are two types: requests (described in section 2.1) and responses (described in section 2.2).

All text must be UTF-8 encoded.

2.1 Requests

Requests support three keys:

A required method string telling the name of the method to invoke
An optional arguments object of key/value pairs. The keys allowed are defined by the method.
An optional tag number used by clients to track responses. If provided by a request, the response MUST include the same tag.

{
   "arguments": {
     "fields": [
       "version"
     ]
   },
   "method": "session-get",
   "tag": 912313
}

2.2 Responses

Responses to a request will include:

A required result string whose value MUST be success on success, or an error string on failure.
An optional arguments object of key/value pairs. Its keys contents are defined by the method and arguments of the original request.
An optional tag number as described in 2.1.

{
   "arguments": {
      "version": "2.93 (3c5870d4f5)"
   },
   "result": "success",
   "tag": 912313
}

2.3 Transport mechanism

HTTP POSTing a JSON-encoded request is the preferred way of communicating with a Transmission RPC server. The current Transmission implementation has the default URL as http://host:9091/transmission/rpc. Clients may use this as a default, but should allow the URL to be reconfigured, since the port and path may be changed to allow mapping and/or multiple daemons to run on a single server.

2.3.1 CSRF protection

Most Transmission RPC servers require a X-Transmission-Session-Id header to be sent with requests, to prevent CSRF attacks.

When your request has the wrong id -- such as when you send your first request, or when the server expires the CSRF token -- the Transmission RPC server will return an HTTP 409 error with the right X-Transmission-Session-Id in its own headers.

So, the correct way to handle a 409 response is to update your X-Transmission-Session-Id and to resend the previous request.

2.3.2 DNS rebinding protection

Additional check is being made on each RPC request to make sure that the client sending the request does so using one of the allowed hostnames by which RPC server is meant to be available.

If host whitelisting is enabled (which is true by default), Transmission inspects the Host: HTTP header value (with port stripped, if any) and matches it to one of the whitelisted names. Regardless of host whitelist content, localhost and localhost. domain names as well as all the IP addresses are always implicitly allowed.

For more information on configuration, see settings.json documentation for rpc-host-whitelist-enabled and rpc-host-whitelist keys.

2.3.3 Authentication

Enabling authentication is an optional security feature that can be enabled on Transmission RPC servers. Authentication occurs by method of HTTP Basic Access Authentication.

If authentication is enabled, Transmission inspects the Authorization: HTTP header value to validate the credentials of the request. The value of this HTTP header is expected to be Basic <b64 credentials>, where is equal to a base64 encoded string of the username and password (respectively), separated by a colon.

3 Torrent requests

3.1 Torrent action requests

Method name	libtransmission function	Description
`torrent-start`	tr_torrentStart	start torrent
`torrent-start-now`	tr_torrentStartNow	start torrent disregarding queue position
`torrent-stop`	tr_torrentStop	stop torrent
`torrent-verify`	tr_torrentVerify	verify torrent
`torrent-reannounce`	tr_torrentManualUpdate	re-announce to trackers now

Request arguments: ids, which specifies which torrents to use. All torrents are used if the ids argument is omitted.

ids should be one of the following:

an integer referring to a torrent id
a list of torrent id numbers, SHA1 hash strings, or both
a string, recently-active, for recently-active torrents

Response arguments: none

3.2 Torrent mutator: `torrent-set`

Method name: torrent-set

Request arguments:

Key	Value Type	Value Description
`bandwidthPriority`	number	this torrent's bandwidth tr_priority_t
`downloadLimit`	number	maximum download speed (KBps)
`downloadLimited`	boolean	true if `downloadLimit` is honored
`files-unwanted`	array	indices of file(s) to not download
`files-wanted`	array	indices of file(s) to download
`group`	string	The name of this torrent's bandwidth group
`honorsSessionLimits`	boolean	true if session upload limits are honored
`ids`	array	torrent list, as described in 3.1
`labels`	array	array of string labels
`location`	string	new location of the torrent's content
`peer-limit`	number	maximum number of peers
`priority-high`	array	indices of high-priority file(s)
`priority-low`	array	indices of low-priority file(s)
`priority-normal`	array	indices of normal-priority file(s)
`queuePosition`	number	position of this torrent in its queue [0...n)
`seedIdleLimit`	number	torrent-level number of minutes of seeding inactivity
`seedIdleMode`	number	which seeding inactivity to use. See tr_idlelimit
`seedRatioLimit`	double	torrent-level seeding ratio
`seedRatioMode`	number	which ratio to use. See tr_ratiolimit
`sequentialDownload`	boolean	download torrent pieces sequentially
`trackerAdd`	array	DEPRECATED use trackerList instead
`trackerList`	string	string of announce URLs, one per line, and a blank line between tiers.
`trackerRemove`	array	DEPRECATED use trackerList instead
`trackerReplace`	array	DEPRECATED use trackerList instead
`uploadLimit`	number	maximum upload speed (KBps)
`uploadLimited`	boolean	true if `uploadLimit` is honored

Just as an empty ids value is shorthand for "all ids", using an empty array for files-wanted, files-unwanted, priority-high, priority-low, or priority-normal is shorthand for saying "all files".

Response arguments: none

3.3 Torrent accessor: `torrent-get`

Method name: torrent-get.

Request arguments:

An optional ids array as described in 3.1.
A required fields array of keys. (see list below)
An optional format string specifying how to format the torrents response field. Allowed values are objects (default) and table. (see "Response arguments" below)

Response arguments:

A torrents array.

If the format request was objects (default), torrents will be an array of objects, each of which contains the key/value pairs matching the request's fields arg. This was the only format before Transmission 3 and has some obvious programmer conveniences, such as parsing directly into Javascript objects.

If the format was table, then torrents will be an array of arrays. The first row holds the keys and each remaining row holds a torrent's values for those keys. This format is more efficient in terms of JSON generation and JSON parsing.
If the request's ids field was recently-active, a removed array of torrent-id numbers of recently-removed torrents.

Note: For more information on what these fields mean, see the comments in libtransmission/transmission.h. The 'source' column here corresponds to the data structure there.

Key	Value Type	transmission.h source
`activityDate`	number	tr_stat
`addedDate`	number	tr_stat
`availability`	array (see below)	tr_torrentAvailability()
`bandwidthPriority`	number	tr_priority_t
`comment`	string	tr_torrent_view
`corruptEver`	number	tr_stat
`creator`	string	tr_torrent_view
`dateCreated`	number	tr_torrent_view
`desiredAvailable`	number	tr_stat
`doneDate`	number	tr_stat
`downloadDir`	string	tr_torrent
`downloadedEver`	number	tr_stat
`downloadLimit`	number	tr_torrent
`downloadLimited`	boolean	tr_torrent
`editDate`	number	tr_stat
`error`	number	tr_stat
`errorString`	string	tr_stat
`eta`	number	tr_stat
`etaIdle`	number	tr_stat
`file-count`	number	tr_info
`files`	array (see below)	n/a
`fileStats`	array (see below)	n/a
`group`	string	n/a
`hashString`	string	tr_torrent_view
`haveUnchecked`	number	tr_stat
`haveValid`	number	tr_stat
`honorsSessionLimits`	boolean	tr_torrent
`id`	number	tr_torrent
`isFinished`	boolean	tr_stat
`isPrivate`	boolean	tr_torrent
`isStalled`	boolean	tr_stat
`labels`	array of strings	tr_torrent
`leftUntilDone`	number	tr_stat
`magnetLink`	string	n/a
`manualAnnounceTime`	number	tr_stat
`maxConnectedPeers`	number	tr_torrent
`metadataPercentComplete`	double	tr_stat
`name`	string	tr_torrent_view
`peer-limit`	number	tr_torrent
`peers`	array (see below)	n/a
`peersConnected`	number	tr_stat
`peersFrom`	object (see below)	n/a
`peersGettingFromUs`	number	tr_stat
`peersSendingToUs`	number	tr_stat
`percentComplete`	double	tr_stat
`percentDone`	double	tr_stat
`pieces`	string (see below)	tr_torrent
`pieceCount`	number	tr_torrent_view
`pieceSize`	number	tr_torrent_view
`priorities`	array (see below)	n/a
`primary-mime-type`	string	tr_torrent
`queuePosition`	number	tr_stat
`rateDownload` (B/s)	number	tr_stat
`rateUpload` (B/s)	number	tr_stat
`recheckProgress`	double	tr_stat
`secondsDownloading`	number	tr_stat
`secondsSeeding`	number	tr_stat
`seedIdleLimit`	number	tr_torrent
`seedIdleMode`	number	tr_inactivelimit
`seedRatioLimit`	double	tr_torrent
`seedRatioMode`	number	tr_ratiolimit
`sequentialDownload`	boolean	tr_torrent
`sizeWhenDone`	number	tr_stat
`startDate`	number	tr_stat
`status`	number (see below)	tr_stat
`trackers`	array (see below)	n/a
`trackerList`	string	string of announce URLs, one per line, with a blank line between tiers
`trackerStats`	array (see below)	n/a
`totalSize`	number	tr_torrent_view
`torrentFile`	string	tr_info
`uploadedEver`	number	tr_stat
`uploadLimit`	number	tr_torrent
`uploadLimited`	boolean	tr_torrent
`uploadRatio`	double	tr_stat
`wanted`	array (see below)	n/a
`webseeds`	array of strings	tr_tracker_view
`webseedsSendingToUs`	number	tr_stat

availability: An array of pieceCount numbers representing the number of connected peers that have each piece, or -1 if we already have the piece ourselves.

files: array of objects, each containing:

Key	Value Type	transmission.h source
`bytesCompleted`	number	tr_file_view
`length`	number	tr_file_view
`name`	string	tr_file_view
`beginPiece`	number	tr_file_view
`endPiece`	number	tr_file_view

fileStats: a file's non-constant properties. An array of tr_info.filecount objects, each containing:

Key	Value Type	transmission.h source
`bytesCompleted`	number	tr_file_view
`wanted`	boolean	tr_file_view (Note: Not to be confused with `torrent-get.wanted`, which is an array of 0/1 instead of boolean)
`priority`	number	tr_file_view

peers: an array of objects, each containing:

Key	Value Type	transmission.h source
`address`	string	tr_peer_stat
`clientName`	string	tr_peer_stat
`clientIsChoked`	boolean	tr_peer_stat
`clientIsInterested`	boolean	tr_peer_stat
`flagStr`	string	tr_peer_stat
`isDownloadingFrom`	boolean	tr_peer_stat
`isEncrypted`	boolean	tr_peer_stat
`isIncoming`	boolean	tr_peer_stat
`isUploadingTo`	boolean	tr_peer_stat
`isUTP`	boolean	tr_peer_stat
`peerIsChoked`	boolean	tr_peer_stat
`peerIsInterested`	boolean	tr_peer_stat
`port`	number	tr_peer_stat
`progress`	double	tr_peer_stat
`rateToClient` (B/s)	number	tr_peer_stat
`rateToPeer` (B/s)	number	tr_peer_stat

peersFrom: an object containing:

Key	Value Type	transmission.h source
`fromCache`	number	tr_stat
`fromDht`	number	tr_stat
`fromIncoming`	number	tr_stat
`fromLpd`	number	tr_stat
`fromLtep`	number	tr_stat
`fromPex`	number	tr_stat
`fromTracker`	number	tr_stat

pieces: A bitfield holding pieceCount flags which are set to 'true' if we have the piece matching that position. JSON doesn't allow raw binary data, so this is a base64-encoded string. (Source: tr_torrent)

priorities: An array of tr_torrentFileCount() numbers. Each is the tr_priority_t mode for the corresponding file.

status: A number between 0 and 6, where:

Value	Meaning
0	Torrent is stopped
1	Torrent is queued to verify local data
2	Torrent is verifying local data
3	Torrent is queued to download
4	Torrent is downloading
5	Torrent is queued to seed
6	Torrent is seeding

trackers: array of objects, each containing:

Key	Value Type	transmission.h source
`announce`	string	tr_tracker_view
`id`	number	tr_tracker_view
`scrape`	string	tr_tracker_view
`sitename`	string	tr_tracker_view
`tier`	number	tr_tracker_view

trackerStats: array of objects, each containing:

Key	Value Type	transmission.h source
`announce`	string	tr_tracker_view
`announceState`	number	tr_tracker_view
`downloadCount`	number	tr_tracker_view
`hasAnnounced`	boolean	tr_tracker_view
`hasScraped`	boolean	tr_tracker_view
`host`	string	tr_tracker_view
`id`	number	tr_tracker_view
`isBackup`	boolean	tr_tracker_view
`lastAnnouncePeerCount`	number	tr_tracker_view
`lastAnnounceResult`	string	tr_tracker_view
`lastAnnounceStartTime`	number	tr_tracker_view
`lastAnnounceSucceeded`	boolean	tr_tracker_view
`lastAnnounceTime`	number	tr_tracker_view
`lastAnnounceTimedOut`	boolean	tr_tracker_view
`lastScrapeResult`	string	tr_tracker_view
`lastScrapeStartTime`	number	tr_tracker_view
`lastScrapeSucceeded`	boolean	tr_tracker_view
`lastScrapeTime`	number	tr_tracker_view
`lastScrapeTimedOut`	boolean	tr_tracker_view
`leecherCount`	number	tr_tracker_view
`nextAnnounceTime`	number	tr_tracker_view
`nextScrapeTime`	number	tr_tracker_view
`scrape`	string	tr_tracker_view
`scrapeState`	number	tr_tracker_view
`seederCount`	number	tr_tracker_view
`sitename`	string	tr_tracker_view
`tier`	number	tr_tracker_view

wanted: An array of tr_torrentFileCount() 0/1, 1 (true) if the corresponding file is to be downloaded. (Source: tr_file_view)

Note: For backwards compatibility, in 4.x.x, wanted is serialized as an array of 0 or 1 that should be treated as booleans. This will be fixed in 5.0.0 to return an array of booleans.

Example:

Say we want to get the name and total size of torrents #7 and #10.

Request:

{
   "arguments": {
       "fields": [ "id", "name", "totalSize" ],
       "ids": [ 7, 10 ]
   },
   "method": "torrent-get",
   "tag": 39693
}

Response:

{
   "arguments": {
      "torrents": [
         {
             "id": 10,
             "name": "Fedora x86_64 DVD",
             "totalSize": 34983493932
         },
         {
             "id": 7,
             "name": "Ubuntu x86_64 DVD",
             "totalSize": 9923890123
         }
      ]
   },
   "result": "success",
   "tag": 39693
}

3.4 Adding a torrent

Method name: torrent-add

Request arguments:

Key	Value Type	Description
`cookies`	string	pointer to a string of one or more cookies.
`download-dir`	string	path to download the torrent to
`filename`	string	filename or URL of the .torrent file
`labels`	array	array of string labels
`metainfo`	string	base64-encoded .torrent content
`paused`	boolean	if true, don't start the torrent
`peer-limit`	number	maximum number of peers
`bandwidthPriority`	number	torrent's bandwidth tr_priority_t
`files-wanted`	array	indices of file(s) to download
`files-unwanted`	array	indices of file(s) to not download
`priority-high`	array	indices of high-priority file(s)
`priority-low`	array	indices of low-priority file(s)
`priority-normal`	array	indices of normal-priority file(s)

Either filename or metainfo must be included. All other arguments are optional.

The format of the cookies should be NAME=CONTENTS, where NAME is the cookie name and CONTENTS is what the cookie should contain. Set multiple cookies like this: name1=content1; name2=content2; etc. See libcurl documentation for more information.

Response arguments:

On success, a torrent-added object in the form of one of 3.3's torrent objects with the fields for id, name, and hashString.
When attempting to add a duplicate torrent, a torrent-duplicate object in the same form is returned, but the response's result value is still success.

3.5 Removing a torrent

Method name: torrent-remove

Key	Value Type	Description
`ids`	array	torrent list, as described in 3.1
`delete-local-data`	boolean	delete local data. (default: false)

Response arguments: none

3.6 Moving a torrent

Method name: torrent-set-location

Request arguments:

Key	Value Type	Description
`ids`	array	torrent list, as described in 3.1
`location`	string	the new torrent location
`move`	boolean	if true, move from previous location. otherwise, search "location" for files (default: false)

Response arguments: none

3.7 Renaming a torrent's path

Method name: torrent-rename-path

For more information on the use of this function, see the transmission.h documentation of tr_torrentRenamePath(). In particular, note that if this call succeeds you'll want to update the torrent's files and name field with torrent-get.

Request arguments:

Key	Value Type	Description
`ids`	array	the torrent list, as described in 3.1 (must only be 1 torrent)
`path`	string	the path to the file or folder that will be renamed
`name`	string	the file or folder's new name

Response arguments: path, name, and id, holding the torrent ID integer

4 Session requests

4.1 Session arguments

Key	Value Type	Description
`alt-speed-down`	number	max global download speed (KBps)
`alt-speed-enabled`	boolean	true means use the alt speeds
`alt-speed-time-begin`	number	when to turn on alt speeds (units: minutes after midnight)
`alt-speed-time-day`	number	what day(s) to turn on alt speeds (look at tr_sched_day)
`alt-speed-time-enabled`	boolean	true means the scheduled on/off times are used
`alt-speed-time-end`	number	when to turn off alt speeds (units: same)
`alt-speed-up`	number	max global upload speed (KBps)
`blocklist-enabled`	boolean	true means enabled
`blocklist-size`	number	number of rules in the blocklist
`blocklist-url`	string	location of the blocklist to use for `blocklist-update`
`cache-size-mb`	number	maximum size of the disk cache (MB)
`config-dir`	string	location of transmission's configuration directory
`default-trackers`	string	announce URLs, one per line, and a blank line between tiers.
`dht-enabled`	boolean	true means allow DHT in public torrents
`download-dir`	string	default path to download torrents
`download-dir-free-space`	number	DEPRECATED Use the `free-space` method instead.
`download-queue-enabled`	boolean	if true, limit how many torrents can be downloaded at once
`download-queue-size`	number	max number of torrents to download at once (see download-queue-enabled)
`encryption`	string	`required`, `preferred`, `tolerated`
`idle-seeding-limit-enabled`	boolean	true if the seeding inactivity limit is honored by default
`idle-seeding-limit`	number	torrents we're seeding will be stopped if they're idle for this long
`incomplete-dir-enabled`	boolean	true means keep torrents in incomplete-dir until done
`incomplete-dir`	string	path for incomplete torrents, when enabled
`lpd-enabled`	boolean	true means allow Local Peer Discovery in public torrents
`peer-limit-global`	number	maximum global number of peers
`peer-limit-per-torrent`	number	maximum global number of peers
`peer-port-random-on-start`	boolean	true means pick a random peer port on launch
`peer-port`	number	port number
`pex-enabled`	boolean	true means allow PEX in public torrents
`port-forwarding-enabled`	boolean	true means ask upstream router to forward the configured peer port to transmission using UPnP or NAT-PMP
`queue-stalled-enabled`	boolean	whether or not to consider idle torrents as stalled
`queue-stalled-minutes`	number	torrents that are idle for N minuets aren't counted toward seed-queue-size or download-queue-size
`rename-partial-files`	boolean	true means append `.part` to incomplete files
`reqq`	number	the number of outstanding block requests a peer is allowed to queue in the client
`rpc-version-minimum`	number	the minimum RPC API version supported
`rpc-version-semver`	string	the current RPC API version in a semver-compatible string
`rpc-version`	number	the current RPC API version
`script-torrent-added-enabled`	boolean	whether or not to call the `added` script
`script-torrent-added-filename`	string	filename of the script to run
`script-torrent-done-enabled`	boolean	whether or not to call the `done` script
`script-torrent-done-filename`	string	filename of the script to run
`script-torrent-done-seeding-enabled`	boolean	whether or not to call the `seeding-done` script
`script-torrent-done-seeding-filename`	string	filename of the script to run
`seed-queue-enabled`	boolean	if true, limit how many torrents can be uploaded at once
`seed-queue-size`	number	max number of torrents to uploaded at once (see seed-queue-enabled)
`seedRatioLimit`	double	the default seed ratio for torrents to use
`seedRatioLimited`	boolean	true if seedRatioLimit is honored by default
`session-id`	string	the current `X-Transmission-Session-Id` value
`speed-limit-down-enabled`	boolean	true means enabled
`speed-limit-down`	number	max global download speed (KBps)
`speed-limit-up-enabled`	boolean	true means enabled
`speed-limit-up`	number	max global upload speed (KBps)
`start-added-torrents`	boolean	true means added torrents will be started right away
`trash-original-torrent-files`	boolean	true means the .torrent file of added torrents will be deleted
`units`	object	see below
`utp-enabled`	boolean	true means allow UTP
`version`	string	long version string `$version ($revision)`

units: an object containing:

Key	Value Type	transmission.h source
`speed-units`	array	4 strings: KB/s, MB/s, GB/s, TB/s
`speed-bytes`	number	number of bytes in a KB (1000 for kB; 1024 for KiB)
`size-units`	array	4 strings: KB/s, MB/s, GB/s, TB/s
`size-bytes`	number	number of bytes in a KB (1000 for kB; 1024 for KiB)
`memory-units`	array	4 strings: KB/s, MB/s, GB/s, TB/s
`memory-bytes`	number	number of bytes in a KB (1000 for kB; 1024 for KiB)

rpc-version indicates the RPC interface version supported by the RPC server. It is incremented when a new version of Transmission changes the RPC interface.

rpc-version-minimum indicates the oldest API supported by the RPC server. It is changes when a new version of Transmission changes the RPC interface in a way that is not backwards compatible. There are no plans for this to be common behavior.

4.1.1 Mutators

Method name: session-set

Request arguments: the mutable properties from 4.1's arguments, i.e. all of them except:

blocklist-size
config-dir
rpc-version-minimum,
rpc-version-semver
rpc-version
session-id
units
version

Response arguments: none

4.1.2 Accessors

Method name: session-get

Request arguments: an optional fields array of keys (see 4.1)

Response arguments: key/value pairs matching the request's fields argument if present, or all supported fields (see 4.1) otherwise.

4.2 Session statistics

Method name: session-stats

Request arguments: none

Response arguments:

Key	Value Type	Description
`activeTorrentCount`	number
`downloadSpeed`	number
`pausedTorrentCount`	number
`torrentCount`	number
`uploadSpeed`	number
`cumulative-stats`	stats object (see below)
`current-stats`	stats object (see below)

A stats object contains:

Key	Value Type	transmission.h source
`uploadedBytes`	number	tr_session_stats
`downloadedBytes`	number	tr_session_stats
`filesAdded`	number	tr_session_stats
`sessionCount`	number	tr_session_stats
`secondsActive`	number	tr_session_stats

4.3 Blocklist

Method name: blocklist-update

Request arguments: none

Response arguments: a number blocklist-size

4.4 Port checking

This method tests to see if your incoming peer port is accessible from the outside world.

Method name: port-test

Request arguments: an optional argument ipProtocol. ipProtocol is a string specifying the IP protocol version to be used for the port test. Set to ipv4 to check IPv4, or set to ipv6 to check IPv6. For backwards compatibility, it is allowed to omit this argument to get the behaviour before Transmission 4.1.0, which is to check whichever IP protocol the OS happened to use to connect to our port test service, frankly not very useful.

Response arguments:

Key	Value Type	Description
`port-is-open`	boolean	true if port is open, false if port is closed
`ipProtocol`	string	`ipv4` if the test was carried out on IPv4, `ipv6` if the test was carried out on IPv6, unset if it cannot be determined

4.5 Session shutdown

This method tells the transmission session to shut down.

Method name: session-close

Request arguments: none

Response arguments: none

4.6 Queue movement requests

Method name	transmission.h source
`queue-move-top`	tr_torrentQueueMoveTop()
`queue-move-up`	tr_torrentQueueMoveUp()
`queue-move-down`	tr_torrentQueueMoveDown()
`queue-move-bottom`	tr_torrentQueueMoveBottom()

Request arguments:

Key	Value Type	Description
`ids`	array	torrent list, as described in 3.1.

Response arguments: none

4.7 Free space

This method tests how much free space is available in a client-specified folder.

Method name: free-space

Request arguments:

Key	Value type	Description
`path`	string	the directory to query

Response arguments:

Key	Value type	Description
`path`	string	same as the Request argument
`size-bytes`	number	the size, in bytes, of the free space in that directory
`total_size`	number	the total capacity, in bytes, of that directory

4.8 Bandwidth groups

4.8.1 Bandwidth group mutator: `group-set`

Method name: group-set

Request parameters:

Key	Value type	Description
`honorsSessionLimits`	boolean	true if session upload limits are honored
`name`	string	Bandwidth group name
`speed-limit-down-enabled`	boolean	true means enabled
`speed-limit-down`	number	max global download speed (KBps)
`speed-limit-up-enabled`	boolean	true means enabled
`speed-limit-up`	number	max global upload speed (KBps)

Response arguments: none

4.8.2 Bandwidth group accessor: `group-get`

Method name: group-get

Request arguments: An optional argument group. group is either a string naming the bandwidth group, or a list of such strings. If group is omitted, all bandwidth groups are used.

Response arguments:

Key	Value type	Description
`group`	array	A list of bandwidth group description objects

A bandwidth group description object has:

Key	Value type	Description
`honorsSessionLimits`	boolean	true if session upload limits are honored
`name`	string	Bandwidth group name
`speed-limit-down-enabled`	boolean	true means enabled
`speed-limit-down`	number	max global download speed (KBps)
`speed-limit-up-enabled`	boolean	true means enabled
`speed-limit-up`	number	max global upload speed (KBps)

5 Protocol versions

This section lists the changes that have been made to the RPC protocol.

There are two ways to check for API compatibility. Since most developers know semver, session-get's rpc-version-semver is the recommended way. That value is a semver-compatible string of the RPC protocol version number.

Since Transmission predates the semver 1.0 spec, the previous scheme was for the RPC version to be a whole number and to increment it whenever a change was made. That is session-get's rpc-version. rpc-version-minimum lists the oldest version that is compatible with the current version; i.e. an app coded to use rpc-version-minimum would still work on a Transmission release running rpc-version.

Breaking changes are denoted with a 💣 emoji.

Transmission 1.30 (rpc-version-semver 1.0.0, rpc-version: 1)

Initial revision.

Transmission 1.40 (rpc-version-semver 1.1.0, rpc-version: 2)

Method	Description
`torrent-get`	new `port` to `peers`

Transmission 1.41 (rpc-version-semver 1.2.0, rpc-version: 3)

Method	Description
`session-get`	new arg `version`
`torrent-get`	new arg `downloaders`
`torrent-remove`	new method

Transmission 1.50 (rpc-version-semver 1.3.0, rpc-version: 4)

Method	Description
`session-get`	new arg `rpc-version-minimum`
`session-get`	new arg `rpc-version`
`session-stats`	added `cumulative-stats`
`session-stats`	added `current-stats`
`torrent-get`	new arg `downloadDir`

Transmission 1.60 (rpc-version-semver 2.0.0, rpc-version: 5)

Method	Description
`session-get`	💣 renamed `peer-limit` to `peer-limit-global`
`session-get`	💣 renamed `pex-allowed` to `pex-enabled`
`session-get`	💣 renamed `port` to `peer-port`
`torrent-get`	💣 removed arg `downloadLimitMode`
`torrent-get`	💣 removed arg `uploadLimitMode`
`torrent-set`	💣 renamed `speed-limit-down-enabled` to `downloadLimited`
`torrent-set`	💣 renamed `speed-limit-down` to `downloadLimit`
`torrent-set`	💣 renamed `speed-limit-up-enabled` to `uploadLimited`
`torrent-set`	💣 renamed `speed-limit-up` to `uploadLimit`
`blocklist-update`	new method
`port-test`	new method
`session-get`	new arg `alt-speed-begin`
`session-get`	new arg `alt-speed-down`
`session-get`	new arg `alt-speed-enabled`
`session-get`	new arg `alt-speed-end`
`session-get`	new arg `alt-speed-time-enabled`
`session-get`	new arg `alt-speed-up`
`session-get`	new arg `blocklist-enabled`
`session-get`	new arg `blocklist-size`
`session-get`	new arg `peer-limit-per-torrent`
`session-get`	new arg `seedRatioLimit`
`session-get`	new arg `seedRatioLimited`
`torrent-add`	new arg `files-unwanted`
`torrent-add`	new arg `files-wanted`
`torrent-add`	new arg `priority-high`
`torrent-add`	new arg `priority-low`
`torrent-add`	new arg `priority-normal`
`torrent-get`	new arg `bandwidthPriority`
`torrent-get`	new arg `fileStats`
`torrent-get`	new arg `honorsSessionLimits`
`torrent-get`	new arg `percentDone`
`torrent-get`	new arg `pieces`
`torrent-get`	new arg `seedRatioLimit`
`torrent-get`	new arg `seedRatioMode`
`torrent-get`	new arg `torrentFile`
`torrent-get`	new ids option `recently-active`
`torrent-reannounce`	new method
`torrent-set`	new arg `bandwidthPriority`
`torrent-set`	new arg `honorsSessionLimits`
`torrent-set`	new arg `seedRatioLimit`
`torrent-set`	new arg `seedRatioLimited`

Transmission 1.70 (rpc-version-semver 2.1.0, rpc-version: 6)

Method	Description
`method torrent-set-location`	new method

Transmission 1.80 (rpc-version-semver 3.0.0, rpc-version: 7)

Method	Description
`torrent-get`	💣 removed arg `announceResponse` (use `trackerStats instead`)
`torrent-get`	💣 removed arg `announceURL` (use `trackerStats instead`)
`torrent-get`	💣 removed arg `downloaders` (use `trackerStats instead`)
`torrent-get`	💣 removed arg `lastAnnounceTime` (use `trackerStats instead`)
`torrent-get`	💣 removed arg `lastScrapeTime` (use `trackerStats instead`)
`torrent-get`	💣 removed arg `leechers` (use `trackerStats instead`)
`torrent-get`	💣 removed arg `nextAnnounceTime` (use `trackerStats instead`)
`torrent-get`	💣 removed arg `nextScrapeTime` (use `trackerStats instead`)
`torrent-get`	💣 removed arg `scrapeResponse` (use `trackerStats instead`)
`torrent-get`	💣 removed arg `scrapeURL` (use `trackerStats instead`)
`torrent-get`	💣 removed arg `seeders` (use `trackerStats instead`)
`torrent-get`	💣 removed arg `swarmSpeed`
`torrent-get`	💣 removed arg `timesCompleted` (use `trackerStats instead`)
`session-set`	new arg `incomplete-dir-enabled`
`session-set`	new arg `incomplete-dir`
`torrent-get`	new arg `magnetLink`
`torrent-get`	new arg `metadataPercentComplete`
`torrent-get`	new arg `trackerStats`

Transmission 1.90 (rpc-version-semver 3.1.0, rpc-version: 8)

Method	Description
`session-set`	new arg `rename-partial-files`
`session-get`	new arg `rename-partial-files`
`session-get`	new arg `config-dir`
`torrent-add`	new arg `bandwidthPriority`
`torrent-get`	new trackerStats arg `lastAnnounceTimedOut`

Transmission 1.92 (rpc-version-semver 3.2.0, rpc-version: 8)

Note: rpc-version was not bumped in this release due to an oversight.

Method	Description
`torrent-get`	new trackerStats arg `lastScrapeTimedOut`

Transmission 2.00 (rpc-version-semver 3.3.0, rpc-version: 9)

Method	Description
`session-set`	new arg `start-added-torrents`
`session-set`	new arg `trash-original-torrent-files`
`session-get`	new arg `start-added-torrents`
`session-get`	new arg `trash-original-torrent-files`
`torrent-get`	new arg `isFinished`

Transmission 2.10 (rpc-version-semver 3.4.0, rpc-version: 10)

Method	Description
`session-get`	new arg `cache-size-mb`
`session-get`	new arg `units`
`session-set`	new arg `idle-seeding-limit-enabled`
`session-set`	new arg `idle-seeding-limit`
`torrent-set`	new arg `seedIdleLimit`
`torrent-set`	new arg `seedIdleMode`
`torrent-set`	new arg `trackerAdd`
`torrent-set`	new arg `trackerRemove`
`torrent-set`	new arg `trackerReplace`

Transmission 2.12 (rpc-version-semver 3.5.0, rpc-version: 11)

Method	Description
`session-get`	new arg `blocklist-url`
`session-set`	new arg `blocklist-url`

Transmission 2.20 (rpc-version-semver 3.6.0, rpc-version: 12)

Method	Description
`session-get`	new arg `download-dir-free-space`
`session-close`	new method

Transmission 2.30 (rpc-version-semver 4.0.0, rpc-version: 13)

Method	Description
`torrent-get`	💣 removed arg `peersKnown`
`session-get`	new arg `isUTP` to the `peers` list
`torrent-add`	new arg `cookies`

Transmission 2.40 (rpc-version-semver 5.0.0, rpc-version: 14)

Method	Description
`torrent-get`	💣 values of `status` field changed
`queue-move-bottom`	new method
`queue-move-down`	new method
`queue-move-top`	new method
`session-set`	new arg `download-queue-enabled`
`session-set`	new arg `download-queue-size`
`session-set`	new arg `queue-stalled-enabled`
`session-set`	new arg `queue-stalled-minutes`
`session-set`	new arg `seed-queue-enabled`
`session-set`	new arg `seed-queue-size`
`torrent-get`	new arg `fromLpd` in peersFrom
`torrent-get`	new arg `isStalled`
`torrent-get`	new arg `queuePosition`
`torrent-set`	new arg `queuePosition`
`torrent-start-now`	new method

Transmission 2.80 (rpc-version-semver 5.1.0, rpc-version: 15)

Method	Description
`torrent-get`	new arg `etaIdle`
`torrent-rename-path`	new method
`free-space`	new method
`torrent-add`	new return arg `torrent-duplicate`

Transmission 3.00 (rpc-version-semver 5.2.0, rpc-version: 16)

Method	Description
`session-get`	new request arg `fields`
`session-get`	new arg `session-id`
`torrent-get`	new arg `labels`
`torrent-set`	new arg `labels`
`torrent-get`	new arg `editDate`
`torrent-get`	new request arg `format`

Transmission 4.0.0 (rpc-version-semver 5.3.0, rpc-version: 17)

Method	Description
`/upload`	⚠️ undocumented `/upload` endpoint removed
`session-get`	⚠️ DEPRECATED `download-dir-free-space`. Use `free-space` instead.
`free-space`	new return arg `total_size`
`session-get`	new arg `default-trackers`
`session-get`	new arg `rpc-version-semver`
`session-get`	new arg `script-torrent-added-enabled`
`session-get`	new arg `script-torrent-added-filename`
`session-get`	new arg `script-torrent-done-seeding-enabled`
`session-get`	new arg `script-torrent-done-seeding-filename`
`torrent-add`	new arg `labels`
`torrent-get`	new arg `availability`
`torrent-get`	new arg `file-count`
`torrent-get`	new arg `group`
`torrent-get`	new arg `percentComplete`
`torrent-get`	new arg `primary-mime-type`
`torrent-get`	new arg `tracker.sitename`
`torrent-get`	new arg `trackerStats.sitename`
`torrent-get`	new arg `trackerList`
`torrent-set`	new arg `group`
`torrent-set`	new arg `trackerList`
`torrent-set`	⚠️ DEPRECATED `trackerAdd`. Use `trackerList` instead.
`torrent-set`	⚠️ DEPRECATED `trackerRemove`. Use `trackerList` instead.
`torrent-set`	⚠️ DEPRECATED `trackerReplace`. Use `trackerList` instead.
`group-set`	new method
`group-get`	new method
`torrent-get`	⚠️ old arg `wanted` was implemented as an array of `0` or `1` in Transmission 3.00 and older, despite being documented as an array of booleans. Transmission 4.0.0 and 4.0.1 "fixed" this by returning an array of booleans; but in practical terms, this change caused an unannounced breaking change for any 3rd party code that expected `0` or `1`. For this reason, 4.0.2 restored the 3.00 behavior and updated this spec to match the code.

Transmission 4.1.0 (rpc-version-semver 5.4.0, rpc-version: 18)

Method	Description
`torrent-get`	new arg `sequentialDownload`
`torrent-set`	new arg `sequentialDownload`
`torrent-get`	new arg `files.beginPiece`
`torrent-get`	new arg `files.endPiece`
`port-test`	new arg `ipProtocol`

41 KiB Raw Blame History

Transmission's RPC specification

1.1 Terminology

1.2 Tools

1.3 Libraries of ready-made wrappers

2 Message format

2.1 Requests

2.2 Responses

2.3 Transport mechanism

2.3.1 CSRF protection

2.3.2 DNS rebinding protection

2.3.3 Authentication

3 Torrent requests

3.1 Torrent action requests

3.2 Torrent mutator: torrent-set

3.3 Torrent accessor: torrent-get

3.4 Adding a torrent

3.5 Removing a torrent

3.6 Moving a torrent

3.7 Renaming a torrent's path

4 Session requests

4.1 Session arguments

4.1.1 Mutators

4.1.2 Accessors

4.2 Session statistics

4.3 Blocklist

4.4 Port checking

4.5 Session shutdown

4.6 Queue movement requests

4.7 Free space

4.8 Bandwidth groups

4.8.1 Bandwidth group mutator: group-set

4.8.2 Bandwidth group accessor: group-get

5 Protocol versions

41 KiB

Raw Blame History

3.2 Torrent mutator: `torrent-set`

3.3 Torrent accessor: `torrent-get`

4.8.1 Bandwidth group mutator: `group-set`

4.8.2 Bandwidth group accessor: `group-get`