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API

Most API methods are supported over both the Websocket and HTTP transports. File Transfer and "/access" requests are only available over HTTP. The Websocket is required to receive printer generated events such as gcode responses. For information on how to set up the Websocket, please see the Appendix at the end of this document.

Note that all HTTP responses are returned as a json encoded object in the form of:

{result: <response data>}

The command matches the original command request, the result is the return value generated from the request.

Websocket requests are returned in JSON-RPC format: {jsonrpc: "2.0", "result": <response data>, id: <request id>}

HTML requests will recieve a 500 status code on error, accompanied by the specific error message.

Websocket requests that result in an error will receive a properly formatted JSON-RPC response: {jsonrpc: "2.0", "error": {code: <code>, message: <msg>}, id: <request_id>} Note that under some circumstances it may not be possible for the server to return a request ID, such as an improperly formatted json request.

The test\client folder includes a basic test interface with example usage for most of the requests below. It also includes a basic JSON-RPC implementation that uses promises to return responses and errors (see json-rcp.js).

Printer Administration

Get Klippy host information:

HTTP command:
GET /printer/info
Websocket command:
{jsonrpc: "2.0", method: "printer.info", id: <request id>}

Returns:
An object containing the build version, cpu info, Klippy's current state.

{
  state: "<klippy state>",
  state_message: "<current state message>",
  hostname: "<hostname>",
  software_version: "<version>",
  cpu_info: "<cpu_info>",
  klipper_path: "<moonraker use only>",
  python_path: "<moonraker use only>",
  log_file: "<moonraker use only>",
  config_file: "<moonraker use only>",
}

Emergency Stop

HTTP command:
POST /printer/emergency_stop
Websocket command:
{jsonrpc: "2.0", method: "printer.emergency_stop", id: <request id>}
Returns:
ok

Restart the host

HTTP command:
POST /printer/restart
Websocket command:
{jsonrpc: "2.0", method: "printer.restart", id: <request id>}
Returns:
ok

Restart the firmware (restarts the host and all connected MCUs)

HTTP command:
POST /printer/firmware_restart
Websocket command:
{jsonrpc: "2.0", method: "printer.firmware_restart", id: <request id>}
Returns:
ok

Printer Status

Request available printer objects and their attributes:

HTTP command:
GET /printer/objects/list
Websocket command:
{jsonrpc: "2.0", method: "printer.objects.list", id: <request id>}
Returns:
An a list of "printer objects" that are currently available for query or subscription. This list will be passed in an "objects" parameter.
```
{ objects: ["gcode", "toolhead", "bed_mesh", "configfile",....]}
```

Query the a status for an object, or group of objects:

HTTP command:
GET /printer/objects/query?gcode

The above will fetch a status update for all gcode attributes. The query string can contain multiple items, and specify individual attributes:

?gcode=gcode_position,busy&toolhead&extruder=target
Websocket command:
{jsonrpc: "2.0", method: "printer.objects.query", params: {objects: {gcode: [], toolhead: ["position", "status"]}}, id: <request id>}

Note that an empty array will fetch all available attributes for its key.

Returns:
An object where the top level items are "eventtime" and "status". The "status" item contains data about the requested update.

{
  eventtime: <klippy time of update>,
  status: {
    gcode: {
      busy: true,
      gcode_position: [0, 0, 0 ,0],
      ...},
    toolhead: {
      position: [0, 0, 0, 0],
      status: "Ready",
      ...},
    ...}
  }

HTTP command:
POST /printer/objects/subscribe?gcode=gcode_position,bus&extruder=target
Websocket command:
{jsonrpc: "2.0", method: "printer.objects.subscribe", params: {objects: {gcode: [], toolhead: ["position", "status"]}}, id: <request id>}
Returns:
Status data for all currently subscribed objects, with the format matching that of the /printer/objects/query:
```
{
  eventtime: <klippy time of update>,
  status: {
    gcode: {
      busy: true,
      gcode_position: [0, 0, 0 ,0],
      ...},
    toolhead: {
      position: [0, 0, 0, 0],
      status: "Ready",
      ...},
    ...}
  }
```
Note that Moonraker's current behavior is maintain a superset of all client subscriptions, thus you may received data for objects that you did not request. This behavior is subject to change in the future (where each client receives only the subscriptions it requested).

Future updates for subscribed objects are sent asynchronously over the websocket. See the notify_status_update notification for details.

Query Endstops

HTTP command:
GET /printer/query_endstops/status
Websocket command:
{jsonrpc: "2.0", method: "printer.query_endstops.status", id: <request id>}
Returns:
An object containing the current endstop state, with each attribute in the format of endstop:<state>, where "state" can be "open" or "TRIGGERED", for example:

  {x: "TRIGGERED",
   y: "open",
   z: "open"}

Fetch stored temperature data

HTTP command:
GET /server/temperature_store
Websocket command: {jsonrpc: "2.0", method: "server.temperature_store", id: <request id>}
Returns:
An object where the keys are the available temperature sensor names, and with the value being an array of stored temperatures. The array is updated every 1 second by default, containing a total of 1200 values (20 minutes). The array is organized from oldest temperature to most recent (left to right). Note that when the host starts each array is initialized to 0s.

Gcode Controls

Run a gcode:

HTTP command:
POST /printer/gcode/script?script=<gc>

For example,
POST /printer/gcode/script?script=RESPOND MSG=Hello
Will echo "Hello" to the terminal.
Websocket command:
{jsonrpc: "2.0", method: "printer.gcode.script", params: {script: <gc>}, id: <request id>}
Returns:
An acknowledgement that the gcode has completed execution:

ok

Get GCode Help

HTTP command:
GET /printer/gcode/help
Websocket command:
{jsonrpc: "2.0", method: "printer.gcode.help", params: {script: <gc>}, id: <request id>}
Returns:
An object where they keys are gcode handlers and values are the associated help strings. Note that help strings are not available for basic gcode handlers such as G1, G28, etc.

Print Management

Print a file

HTTP command:
POST /printer/print/start?filename=<file name>
Websocket command:
{jsonrpc: "2.0", method: "printer.print.start", params: {filename: <file name>, id:<request id>}
Returns:
ok on success

Pause a print

HTTP command:
POST /printer/print/pause
Websocket command:
{jsonrpc: "2.0", method: "printer.print.pause", id: <request id>}
Returns:
ok

Resume a print

HTTP command:
POST /printer/print/resume
Websocket command:
{jsonrpc: "2.0", method: "printer.print.resume", id: <request id>}
Returns:
ok

Cancel a print

HTTP command:
POST /printer/print/cancel
Websocket command:
{jsonrpc: "2.0", method: "printer.print.cancel", id: <request id>}
Returns:
ok

Machine Commands

Shutdown the Operating System

HTTP command:
POST /machine/shutdown
Websocket command:
{jsonrpc: "2.0", method: "machine.shutdown", id: <request id>}
Returns:
No return value as the server will shut down upon execution

Reboot the Operating System

HTTP command:
POST /machine/reboot
Websocket command:
{jsonrpc: "2.0", method: "machine.reboot", id: <request id>}
Returns:
No return value as the server will shut down upon execution

File Operations

Most file operations are available over both APIs, however file upload, file download, and file delete are currently only available via HTTP APIs.

Moonraker organizes different local directories into "roots". For example, gcodes are located at http:\\host\server\files\gcodes\*, otherwise known as the "gcodes" root. The following roots are available:

gcodes
config
config_examples (read-only)

Write operations (upload, delete, make directory, remove directory) are only available on the gcodes and config roots. Note that the config root is only available if the "config_path" option has been set in Moonraker's configuration.

List Available Files

Walks through a directory and fetches all files. All file names include a path relative to the specified "root". Note that if the query st

HTTP command:
GET /server/files/list?root=gcodes

If the query string is omitted then the command will return the "gcodes" file list by default.
Websocket command:
{jsonrpc: "2.0", method: "server.files.list", params: {root: "gcodes"} , id: <request id>}

If params are are omitted then the command will return the "gcodes" file list.
Returns:
A list of objects containing file data in the following format:

[
  {filename: "file name",
   size: <file size>,
   modified: "last modified date",
   ...]

Get GCode Metadata

Get file metadata for a specified gcode file. If the file is located in a subdirectory, then the file name should include the path relative to the "gcodes" root. For example, if the file is located at:
http://host/server/files/gcodes/my_sub_dir/my_print.gcode Then the filename should be my_sub_dir/my_print.gcode.

HTTP command:
GET /server/files/metadata?filename=<filename>
Websocket command:
{jsonrpc: "2.0", method: "server.files.metadata", params: {filename: "filename"} , id: <request id>}
Returns:
Metadata for the requested file if it exists. If any fields failed parsing they will be omitted. The metadata will always include the file name, modified time, and size.

  {
    filename: "file name",
    size: <file size>,
    modified: "last modified date",
    slicer: "Slicer Name",
    first_layer_height: <in mm>,
    layer_height: <in mm>,
    object_height: <in mm>,
    estimated_time: <time in seconds>,
    filament_total: <in mm>,
    thumbnails: [
      {
        width: <in pixels>,
        height: <in pixels>,
        size: <length of string>,
        data: <base64 string>
      }, ...
    ]
  }

Get directory information

Returns a list of files and subdirectories given a supplied path. Unlike /server/files/list, this command does not walk through subdirectories.

HTTP command:
GET /server/files/directory?path=gcodes/my_subdir

If the query string is omitted then the command will return the "gcodes" file list by default.
Websocket command:
{jsonrpc: "2.0", method: "server.files.get_directory", params: {path: "gcodes/my_subdir"} , id: <request id>}

If the "params" are omitted then the command will return the "gcodes" file list by default.
Returns:
An object containing file and subdirectory information in the following format:

  {
    files: [
      {
        filename: "file name",
        size: <file size>,
        modified: "last modified date"
      }, ...
    ],
    dirs: [
      {
        dirname: "directory name",
        modified: "last modified date"
      }
    ]
  }

Make new directory

Creates a new directory at the specified path.

HTTP command:
POST /server/files/directory?path=gcodes/my_new_dir
Websocket command:
{jsonrpc: "2.0", method: "server.files.post_directory", params: {path: "gcodes/my_new_dir"}, id: <request id>}

Returns:
ok if successful

Delete directory

Deletes a directory at the specified path.

HTTP command:
DELETE /server/files/directory?path=gcodes/my_subdir
Websocket command:
{jsonrpc: "2.0", method: "server.files.delete_directory", params: {path: "gcodes/my_subdir"} , id: <request id>}

If the specified directory contains files then the delete request will fail, however it is possible to "force" deletion of the directory and all files in it with and additional argument in the query string:
DELETE /server/files/directory?path=gcodes/my_subdir&force=true

OR to the JSON-RPC params:
{jsonrpc: "2.0", method: "get_directory", params: {path: "gcodes/my_subdir", force: True}, id: <request id>}

Note that a forced deletion will still check in with Klippy to be sure that a file in the requested directory is not loaded by the virtual_sdcard.
Returns:
ok if successful

Move a file or directory

Moves a file or directory from one location to another. Note that the following conditions must be met for a move successful move:

The source must exist
The source and destinations must have the same "root" directory
The user (typically "Pi") must have the appropriate file permissions
Neither the source nor destination can be loaded by the virtual_sdcard. If the source or destination is a directory, it cannot contain a file loaded by the virtual_sdcard.

When specifying the source and dest, the "root" directory should be prefixed. Currently the only supported roots are "gcodes/" and "config/".

This API may also be used to rename a file or directory. Be aware that an attempt to rename a directory to a directory that already exists will result in moving the source directory to the destination directory.

HTTP command:
POST /server/files/move?source=gcodes/my_file.gcode &dest=gcodes/subdir/my_file.gcode
Websocket command:
{jsonrpc: "2.0", method: "server.files.move", params: {source: "gcodes/my_file.gcode", dest: "gcodes/subdir/my_file.gcode"}, id: <request id>}

Copy a file or directory

Copies a file or directory from one location to another. A successful copy has the pre-requesites as a move with one exception, a copy may complete if the source file/directory is loaded by the virtual_sdcard. As with the move API, the source and destination should have the root prefixed.

HTTP command:
POST /server/files/copy?source=gcodes/my_file.gcode &dest=gcodes/subdir/my_file.gcode
Websocket command:
{jsonrpc: "2.0", method: "server.files.copy", params: {source: "gcodes/my_file.gcode", dest: "gcodes/subdir/my_file.gcode"}, id: <request id>}

Gcode File Download

HTTP command:
GET /server/files/gcodes/<file_name>
Websocket command:
Not Available
Returns:
The requested file

File Upload

Upload a file. Currently files may be uploaded to the "gcodes" or "config" root, with "gcodes" being the default location. If one wishes to upload to a subdirectory, the path may be added to the upload's file name (relative to the root). If the directory does not exist an error will be returned. Alternatively, the "path" argument may be set, as explained below.

HTTP command:
POST /server/files/upload

The file to be uploaded should be added to the FormData per the XHR spec. The following arguments may be added to the form:
- root: The root location in which to upload the file. Currently this may be "gcodes" or "config". If not specified the default is "gcodes".
- path: This argument may contain a path (relative to the root) indicating a subdirectory to which the file is written. If a "path" is present, the server will attempt to create any subdirectories that do not exist. Arguments available only for the "gcodes" root:
- print: If set to "true", Klippy will attempt to start the print after uploading. Note that this value should be a string type, not boolean. This provides compatibility with Octoprint's legacy upload API.
Websocket command:
Not Available
Returns:
The file name along with a successful response.
```
{'result': "file_name"}
```
If the supplied root is "gcodes", a "print_started" attribute is also returned.
```
{'result': "file_name", 'print_started': <boolean>}
```

Gcode File Delete

Delete a file in the "gcodes" root. A relative path may be added to the file to delete a file in a subdirectory.

HTTP command:
DELETE /server/files/gcodes/<file_name>
Websocket command:
{jsonrpc: "2.0", method: "server.files.delete_file", params: {path: "gcodes/<file_name>"}, id: <request id>}

If the gcode file exists within a subdirectory, the relative path should be included in the file name.
Returns:
The HTTP request returns the name of the deleted file.

Download included config file

HTTP command:
GET /server/files/config/<file_name>
Websocket command:
Not Available
Returns:
The requested file

Delete included config file

Delete a file in the "config" root. A relative path may be added to the file to delete a file in a subdirectory.

HTTP command:
DELETE /server/files/config/<file_name>
Websocket command:
{jsonrpc: "2.0", method: "server.files.delete_file", params: {path: "config/<file_name>}, id: <request id>}
Returns:
The HTTP request returns the name of the deleted file.

Download a config example

HTTP command:
GET /server/files/config_examples/<file_name>
Websocket command:
Not Available
Returns:
The requested file

Download klippy.log

HTTP command:
GET /server/files/klippy.log
Websocket command:
Not Available
Returns:
klippy.log

Download moonraker.log

HTTP command:
GET /server/files/moonraker.log
Websocket command:
Not Available
Returns:
moonraker.log

Authorization

Untrusted Clients must use a key to access the API by including it in the X-Api-Key header for each HTTP Request. The API below allows authorized clients to receive and change the current API Key.

Get the Current API Key

HTTP command:
GET /access/api_key
Websocket command:
Not Available
Returns:
The current API key

Generate a New API Key

HTTP command:
POST /access/api_key
Websocket command:
Not available
Returns:
The newly generated API key. This overwrites the previous key. Note that the API key change is applied immediately, all subsequent HTTP requests from untrusted clients must use the new key.

Generate a Oneshot Token

Some HTTP Requests do not expose the ability the change the headers, which is required to apply the X-Api-Key. To accomodiate these requests it a client may ask the server for a Oneshot Token. Tokens expire in 5 seconds and may only be used once, making them relatively for inclusion in the query string.

HTTP command:
GET /access/oneshot_token
Websocket command: Not available
Returns:
A temporary token that may be added to a requests query string for access to any API endpoint. The query string should be added in the form of: ?token=randomly_generated_token

Websocket notifications

Printer generated events are sent over the websocket as JSON-RPC 2.0 notifications. These notifications are sent to all connected clients in the following format:

{jsonrpc: "2.0", method: <event method name>}

{jsonrpc: "2.0", method: <event method name>, params: [<event parameter>]}

If a notification has parameters, the params value will always be wrapped in an array as directed by the JSON-RPC standard. Currently all notifications available are broadcast with either no parameters or a single parameter.

Gcode response:

All calls to gcode.respond() are forwarded over the websocket. They arrive as a "gcode_response" notification:

{jsonrpc: "2.0", method: "notify_gcode_response", params: ["response"]}

Status subscriptions:

Status Subscriptions arrive as a "notify_status_update" notification:

{jsonrpc: "2.0", method: "notify_status_update", params: [<status_data>]}

The structure of the status data is identical to the structure that is returned from an object query's "status" attribute.

Klippy Disconnected:

Notify clients when Moonraker's connection to Klippy has terminated

{jsonrpc: "2.0", method: "notify_klippy_disconnected"}

File List Changed

When a client makes a change to the virtual sdcard file list (via upload or delete) a notification is broadcast to alert all connected clients of the change:

{jsonrpc: "2.0", method: "notify_filelist_changed", params: [<file changed info>]}

The param is an object in the following format, where the "action" is the operation that prompted the change, and the "item" contains information about the item that has changed:

{action: "<action>",
  item: {
    path: "<file or directory path>",
    root: "<root_name>",
    size: <file size>,
    modified: "<date modified>"
 }

Note that file move and copy actions also include a "source item" that contains the path and root of the source file or directory.

{action: "<action>",
  item: {
    path: "<file or directory path>",
    root: "<root_name>",
    size: <file size>,
    modified: "<date modified>"
 },
  source_item: {
    path: "<file or directory path>",
    root: "<root_name>"
  }
}

The following actions are currently available:

upload_file
delete_file
create_dir
delete_dir
move_item
copy_item

Metadata Update

When a new file is uploaded via the API a websocket notification is broadcast to all connected clients after parsing is complete:

{jsonrpc: "2.0", method: "notify_metadata_update", params: [metadata]}

Where metadata is an object in the following format:

{
  filename: "file name",
  size: <file size>,
  modified: "last modified date",
  slicer: "Slicer Name",
  first_layer_height: <in mm>,
  layer_height: <in mm>,
  object_height: <in mm>,
  estimated_time: <time in seconds>,
  filament_total: <in mm>,
  thumbnails: [
    {
      width: <in pixels>,
      height: <in pixels>,
      size: <length of string>,
      data: <base64 string>
    }, ...
  ]
}

Appendix

Websocket setup

All transmissions over the websocket are done via json using the JSON-RPC 2.0 protocol. While the websever expects a json encoded string, one limitation of Eventlet's websocket is that it can not send string encoded frames. Thus the client will receive data om the server in the form of a binary Blob that must be read using a FileReader object then decoded.

The websocket is located at ws://host:port/websocket, for example:

var s = new WebSocket("ws://" + location.host + "/websocket");

It also should be noted that if authorization is enabled, an untrusted client must request a "oneshot token" and add that token's value to the websocket's query string:

ws://host:port/websocket?token=<32 character base32 string>

This is necessary as it isn't currently possible to add X-Api-Key to a websocket's request header.

The following startup sequence is recommened for clients which make use of the websocket:

Attempt to connect to /websocket until successful using a timer-like mechanism
Once connected, query /printer/info (or printer.info) for the ready status.
- If the response returns an error (such as 404), set a timeout for 2 seconds and try again.
- If the response returns success, check the result's state attribute
  - If state == "ready" you may proceed to request status of printer objects make subscriptions, get the file list, etc.
  - If state == "error" then Klippy has experienced an error
    - If an error is detected it might be wise to prompt the user. You can get a description of the error from the state_message attribute
  - If state == "shutdown" then Klippy is in a shutdown state.
  - If state == "startup" then re-request printer info in 2s.

Repeat step 2s until Klipper reports ready. T
Client's should watch for the notify_klippy_disconnected event. If it reports disconnected then Klippy has either been stopped or restarted. In this instance the client should repeat the steps above to determine when klippy is ready.

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API