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Mattermost for Developers

Developers

Build with, on, and for Mattermost. Contribute to the platform, build plugins and integrations, and extend Mattermost into the rest of your operational stack.

Start here​

Contribute

Set up the development environment, submit pull requests, run tests. The core path for engineers joining the project.

Setup → review → ship
Integrate & Extend

Bots, slash commands, webhooks, OAuth apps, plugins, mobile clients. Build with the platform.

Plugins · Apps · SDK
API Reference

REST API v4 — every endpoint, generated from the canonical OpenAPI spec.

549 endpoints

What's covered here​

  • Contribute — onboarding, expectations, finding good first issues, the contribution workflow.
  • Integrate & Extend — apps, plugins, slash commands, incoming + outgoing webhooks, OAuth, customization, the marketplace.
  • Internal — Mattermost-engineering team docs (build process, infrastructure, QA).

Looking for something else?​

Documentation

Operating, configuring, or using Mattermost? Admin and end-user guides.

API Reference

Hit the REST API directly — every endpoint with request/response schemas and code samples.