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[README] JSON API Endpoint reference documentation

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# forked-daapd API Endpoint Reference
Available API endpoints:
* [Player](#player): control playback, volume, shuffle/repeat modes
* [Outputs / Speakers](#outputs--speakers): list available outputs and enable/disable outputs
* [Server info](#server-info): get server information
* [Push notifications](#push-notifications): receive push notifications
## Player
| Method | Endpoint | Description |
| --------- | ------------------------------------------------ | ------------------------------------ |
| GET | [/api/player](#get-player-status) | Get player status |
| PUT | [/api/player/play, /api/player/pause, /api/player/stop](#control-playback) | Start, pause or stop playback |
| PUT | [/api/player/next, /api/player/prev](#skip-tracks) | Skip forward or backward |
| PUT | [/api/player/shuffle](#set-shuffle-mode) | Set shuffle mode |
| PUT | [/api/player/consume](#set-consume-mode) | Set consume mode |
| PUT | [/api/player/repeat](#set-repeat-mode) | Set repeat mode |
| PUT | [/api/player/volume](#set-volume) | Set master volume or volume for a specific output |
### Get player status
**Endpoint**
```
GET /api/player
```
**Response**
| Key | Type | Value |
| ----------------- | -------- | ----------------------------------------- |
| state | string | `play`, `pause` or `stop` |
| repeat | string | `off`, `all` or `single` |
| consume | boolean | `true` if consume mode is enabled |
| shuffle | boolean | `true` if shuffle mode is enabled |
| volume | integer | Master volume in percent (0 - 100) |
| item_id | integer | The current playing queue item `id` |
| item_length_ms | integer | Total length in milliseconds of the current queue item |
| item_progress_ms | integer | Progress into the current queue item in milliseconds |
**Example**
```
curl -X GET "http://localhost:3689/api/player"
```
```
{
"state": "pause",
"repeat": "off",
"consume": false,
"shuffle": false,
"volume": 50,
"item_id": 269,
"item_length_ms": 278093,
"item_progress_ms": 3674
}
```
### Control playback
Start or resume, pause, stop playback.
**Endpoint**
```
PUT /api/player/play
```
```
PUT /api/player/pause
```
```
PUT /api/player/stop
```
**Response**
On success returns the HTTP `204 No Content` success status response code.
**Example**
```
curl -X PUT "http://localhost:3689/api/player/play"
```
```
curl -X PUT "http://localhost:3689/api/player/pause"
```
```
curl -X PUT "http://localhost:3689/api/player/stop"
```
### Skip tracks
Skip forward or backward
**Endpoint**
```
PUT /api/player/next
```
```
PUT /api/player/prev
```
**Response**
On success returns the HTTP `204 No Content` success status response code.
**Example**
```
curl -X PUT "http://localhost:3689/api/player/next"
```
```
curl -X PUT "http://localhost:3689/api/player/prev"
```
### Set shuffle mode
Enable or disable shuffle mode
**Endpoint**
```
PUT /api/player/shuffle
```
**Query parameters**
| Parameter | Value |
| --------------- | ----------------------------------------------------------- |
| state | The new shuffle state, should be either `true` or `false` |
**Response**
On success returns the HTTP `204 No Content` success status response code.
**Example**
```
curl -X PUT "http://localhost:3689/api/player/shuffle?state=true"
```
### Set consume mode
Enable or disable consume mode
**Endpoint**
```
PUT /api/player/consume
```
**Query parameters**
| Parameter | Value |
| --------------- | ----------------------------------------------------------- |
| state | The new consume state, should be either `true` or `false` |
**Response**
On success returns the HTTP `204 No Content` success status response code.
**Example**
```
curl -X PUT "http://localhost:3689/api/player/consume?state=true"
```
### Set repeat mode
Change repeat mode
**Endpoint**
```
PUT /api/player/repeat
```
**Query parameters**
| Parameter | Value |
| --------------- | ----------------------------------------------------------- |
| state | The new repeat mode, should be either `off`, `all` or `single` |
**Response**
On success returns the HTTP `204 No Content` success status response code.
**Example**
```
curl -X PUT "http://localhost:3689/api/player/repeat?state=all"
```
### Set volume
Change master volume or volume of a specific output.
**Endpoint**
```
PUT /api/player/volume
```
**Query parameters**
| Parameter | Value |
| --------------- | ----------------------------------------------------------- |
| volume | The new volume (0 - 100) |
| output_id | *(Optional)* If an output id is given, only the volume of this output will be changed. If parameter is omited, the master volume will be changed. |
**Response**
On success returns the HTTP `204 No Content` success status response code.
**Example**
```
curl -X PUT "http://localhost:3689/api/player/volume?volume=50"
```
```
curl -X PUT "http://localhost:3689/api/player/volume?volume=50&output_id=0"
```
## Outputs / Speakers
| Method | Endpoint | Description |
| --------- | ------------------------------------------------ | ------------------------------------ |
| GET | [/api/outputs](#get-a-list-of-available-outputs) | Get a list of available outputs |
| PUT | [/api/outputs/set](#set-enabled-outputs) | Set enabled outputs |
| GET | [/api/outputs/{id}](#get-an-output) | Get an output |
| PUT | [/api/outputs/{id}](#change-an-output) | Change an output (enable/disable or volume) |
### Get a list of available outputs
**Endpoint**
```
GET /api/outputs
```
**Response**
| Key | Type | Value |
| --------------- | -------- | ----------------------------------------- |
| outputs | array | Array of `output` objects |
**`output` object**
| Key | Type | Value |
| --------------- | -------- | ----------------------------------------- |
| id | string | Output id |
| name | string | Output name |
| type | string | Type of the output: `AirPlay`, `Chromecast`, `ALSA`, `Pulseaudio`, `fifo` |
| selected | boolean | `true` if output is enabled |
| has_password | boolean | `true` if output is password protected |
| requires_auth | boolean | `true` if output requires authentication |
| needs_auth_key | boolean | `true` if output requires an authorization key (device verification) |
| volume | integer | Volume in percent (0 - 100) |
**Example**
```
curl -X GET "http://localhost:3689/api/outputs"
```
```
{
"outputs": [
{
"id": "123456789012345",
"name": "kitchen",
"type": "AirPlay",
"selected": true,
"has_password": false,
"requires_auth": false,
"needs_auth_key": false,
"volume": 0
},
{
"id": "0",
"name": "Computer",
"type": "ALSA",
"selected": true,
"has_password": false,
"requires_auth": false,
"needs_auth_key": false,
"volume": 19
},
{
"id": "100",
"name": "daapd-fifo",
"type": "fifo",
"selected": false,
"has_password": false,
"requires_auth": false,
"needs_auth_key": false,
"volume": 0
}
]
}
```
### Set enabled outputs
Set the enabled outputs by passing an array of output ids. forked-daapd enables all outputs
with the given ids and disables the remaining outputs.
**Endpoint**
```
PUT /api/outputs/set
```
**Body parameters**
| Parameter | Type | Value |
| --------------- | -------- | -------------------- |
| outputs | array | Array of output ids |
**Response**
On success returns the HTTP `204 No Content` success status response code.
**Example**
```
curl -X PUT "http://localhost:3689/api/outputs/set" --data "{\"outputs\":[\"198018693182577\",\"0\"]}"
```
### Get an output
Get an output
**Endpoint**
```
GET /api/outputs/{id}
```
**Path parameters**
| Parameter | Value |
| --------------- | -------------------- |
| id | Output id |
**Response**
On success returns the HTTP `200 OK` success status response code. With the response body holding the **`output` object**.
**Example**
```
curl -X GET "http://localhost:3689/api/outputs/0"
```
```
{
"id": "0",
"name": "Computer",
"type": "ALSA",
"selected": true,
"has_password": false,
"requires_auth": false,
"needs_auth_key": false,
"volume": 3
}
```
### Change an output
Enable or disable an output and change its volume.
**Endpoint**
```
PUT /api/outputs/{id}
```
**Path parameters**
| Parameter | Value |
| --------------- | -------------------- |
| id | Output id |
**Body parameters**
| Parameter | Type | Value |
| --------------- | --------- | -------------------- |
| selected | boolean | *(Optional)* `true` to enable and `false` to disable the output |
| volume | integer | *(Optional)* Volume in percent (0 - 100) |
**Response**
On success returns the HTTP `204 No Content` success status response code.
**Example**
```
curl -X PUT "http://localhost:3689/api/outputs/0" --data "{\"selected\":true, \"volume\": 50}"
```
## Server info
| Method | Endpoint | Description |
| --------- | ------------------------------------------------ | ------------------------------------ |
| GET | [/api/config](#config) | Get configuration information |
### Config
**Endpoint**
```
GET /api/config
```
**Response**
| Key | Type | Value |
| --------------- | -------- | ----------------------------------------- |
| version | string | forked-daapd server version |
| websocket_port | integer | Port number for the [websocket](#push-notifications) (or `0` if websocket is disabled) |
| buildoptions | array | Array of strings indicating which features are supported by the forked-daapd server |
**Example**
```
curl -X GET "http://localhost:3689/api/config"
```
```
{
"websocket_port": 3688,
"version": "25.0",
"buildoptions": [
"ffmpeg",
"iTunes XML",
"Spotify",
"LastFM",
"MPD",
"Device verification",
"Websockets",
"ALSA"
]
}
```
## Push notifications
If forked-daapd was built with websocket support, forked-daapd exposes a websocket at `localhost:3688` to inform clients of changes (e. g. player state or library updates).
The port depends on the forked-daapd configuration and can be read using the [`/api/config`](#config) endpoint.
After connecting to the websocket, the client should send a message containing the event types it is interested in. After that forked-daapd
will send a message each time one of the events occurred.
**Message**
| Key | Type | Value |
| --------------- | -------- | ----------------------------------------- |
| notify | array | Array of event types |
**Event types**
| Type | Description |
| --------------- | ----------------------------------------- |
| update | Library update started or finished |
| outputs | An output was enabled or disabled |
| player | Player state changes |
| options | Playback option changes (shuffle, repeat, consume mode) |
| volume | Volume changes |
| queue | Queue changes |
**Example**
```
curl --include \
--no-buffer \
--header "Connection: Upgrade" \
--header "Upgrade: websocket" \
--header "Host: localhost:3688" \
--header "Origin: http://localhost:3688" \
--header "Sec-WebSocket-Key: SGVsbG8sIHdvcmxkIQ==" \
--header "Sec-WebSocket-Version: 13" \
--header "Sec-WebSocket-Protocol: notify" \
http://localhost:3688/ \
--data "{ \"notify\": [ \"player\" ] }"
```
```
{
"notify": [
"player"
]
}
```