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Mattermost WebSocket API

Real-time WebSocket event stream for Mattermost v4. Clients connect to /api/v4/websocket, authenticate via cookie, Authorization header, or an authentication_challenge action, and receive event envelopes (event, data, broadcast, seq) covering posts, channels, users, teams, reactions, typing, status, threads, plugins, and more. Client actions user_typing, get_statuses, and get_statuses_by_ids are supported over the same socket.

Mattermost WebSocket API is one of 6 APIs that Mattermost publishes on the APIs.io network, described by an AsyncAPI event-driven specification.

Tagged areas include WebSocket, Event, Real-Time, Messaging, and AsyncAPI. The published artifact set on APIs.io includes API documentation, an AsyncAPI specification, and an API reference.

Requests are made against the base URL wss://your-mattermost-server.com/api/v4/websocket.

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI
Base URL
wss://your-mattermost-server.com/api/v4/websocket

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

mattermost-asyncapi.yml Raw ↑

Other APIs Mattermost publishes across the network.

Mattermost REST API
Mattermost Channels API
Mattermost Posts API
Mattermost Teams API
Mattermost Users API
Where this information came from

This is an independent, third-party profile of Mattermost WebSocket API, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.

The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.

Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.

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