Overview

Mattermost is an open-source messaging platform, and its REST API lets you build bots, integrations, and automation on top of it. You can post messages, manage channels and users, and react to events via webhooks. Because it is self-hosted, you have full control over the data and deployment environment.

Beginner Tip

You can use a personal access token for simpler scripts instead of full OAuth — enable personal access tokens in the Mattermost System Console under Authentication settings and generate one from your account profile.

Available Data

Mattermost data via REST API

Example Response

JSON Response
{
  "status": "success",
  "data": {
    "result": "Data from Mattermost",
    "description": "An open source platform for developer collaboration",
    "timestamp": "2025-01-15T10:00:00Z"
  }
}

Field Reference

id Unique identifier for the user, channel, or post object.
username The unique login name of the user.
email Email address associated with the user account.
create_at Unix timestamp in milliseconds of when the object was created.
roles Space-separated list of roles assigned to the user (e.g., system_user system_admin).

Implementation Example

Request
const url = "https://api.mattermost.com/";
// Replace headers or query params with the values required by this API.
const response = await fetch(url, {
  headers: {
  "Authorization": "Bearer YOUR_API_KEY"
  }
});
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data);

What Can You Build?

Note: These code examples are AI-generated and unverified. Always refer to the official API documentation for accurate usage.

Common Errors & Troubleshooting

401 Unauthorized Access token is invalid or personal access tokens are disabled on the server.
Verify the token is correct and ask a system admin to enable personal access tokens in System Console.
403 Forbidden The user does not have permission to access the requested channel or team.
Ensure the user is a member of the target team or channel before attempting to read or post messages.
Connection refused or 404 on all routes The Mattermost instance URL is incorrect or the API is not accessible externally.
Confirm the server URL ends with /api/v4 and that the server is reachable from your client machine.

Metadata Score Breakdown

Estimated from metadata — endpoint not independently tested

This score is estimated from observable metadata — HTTPS support, authentication model, declared CORS, and documentation reachability — because the API requires authentication or exposes no publicly testable endpoint. The five-signal breakdown is only shown for live-tested APIs.

Metadata estimate · endpoint not independently tested

Technical Specifications

Auth OAuth
HTTPS REQUIRED
CORS UNKNOWN
Difficulty Advanced
Verified: 2026-04-07

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