Starting from version 3.0 Traccar server includes web API to access GPS tracking data from your own applications. Version 3.3 and all later versions are using REST API. Documentation for the API can be found in the swagger.json file and API Reference. There are a lot of tools available to automatically generate client from Swagger format. For more information about Swagger see official website - http://swagger.io/.
There are two authorization options:
View API documentation: