Syncthing exposes a REST interface over HTTP on the GUI port. This is used by the GUI code (JavaScript) and can be used by other processes wishing to control Syncthing. In most cases both the input and output data is in JSON format. The interface is subject to change.


To use the REST AP an API key must be set and used. The API key can be generated in the GUI, or set in the configuration/gui/apikey element in the configuration file. To use an API key, set the request header X-API-Key to the API key value. For example, curl -X POST -H "X-API-Key: abc123" http://localhost:8384/rest/... can be used to invoke with curl.