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
Example 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
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
Matrix Score Breakdown
Partially tested on Apr 5, 2026
Technical Specifications
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