Signal K producers MAY implement an HTTP API which consumers can use to self-configure, poll for Signal K data or make configuration changes. As specified in the previous section, all URLs for interacting with Signal K are rooted at /signalk.

GET /signalk

Making a GET request to /signalk returns a JSON object which specifies the available Signal K endpoints and some information about the server. Also see versioning for details about version strings.

  "endpoints": {
    "v1": {
      "version": "1.alpha1",
      "signalk-http": "http://localhost:3000/signalk/v1/api/",
      "signalk-ws": "ws://localhost:3000/signalk/v1/stream"
    "v3": {
      "version": "3.0",
      "signalk-http": "http://localhost/signalk/v3/api/",
      "signalk-ws": "ws://localhost/signalk/v3/stream",
      "signalk-tcp": "tcp://localhost:8367"
  "server": {
    "id": "signalk-server-node",
    "version": "0.1.33"

This response is defined by the discovery.json schema. In this example, the server supports two versions of the specification: 1.alpha1 and 3.0. For each version, the server indicates which transport protocols it supports and the URL that can be used to access that protocol‘s endpoint. Clients should use one of these published endpoints based on the protocol version they wish to use.

The server must only return valid URLs and should use IANA standard protocol names such as http. However, a server may support unofficial protocols and may return additional protocol names; for example, the response above indicates the server supports a signalk-tcp stream over TCP at on port 8367.

A server may return relative URIs that the client must resolve against the base of the original request.

A server may return information about itself in the server property. The id and version scheme is not defined as part of the specification and there is no registry for id values.


Note the trailing slash in the path

The base URL MUST provide a Signal K document that is valid according to the full Signal K schema specification. The contents SHOULD be all the current values of the data items the server knows in the Signal K full format as specified in Full and Delta Models.


The Signal K data SHOULD be available via the REST API. For example, GET /signalk/v1/api/vessels should return all of the data under the vessels container in JSON format. Likewise, GET /signalk/v1/api/vessels/urn:mrn:signalk:uuid:c0d79334-4e25-4245-8892-54e8ccc8021d should return data for one specific vessel. In other words, the full Signal K data model SHOULD be traversable by any client making GET requests to an arbitrary depth.

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