Post CI and deploy alerts to Gitter with the Gitter REST API

Teams want build, deploy, and alert events to appear in the Gitter room they already monitor, without opening another dashboard. The practical way to do that is a small script that authenticates with a personal access token and posts to /v1/rooms/{roomId}/chatMessages. Room IDs are opaque, so resolve the room via the API first rather than guessing from the URL.

What you need before posting

A Gitter account with access to the target room is required. Create a personal access token in Gitter developer settings and store it as a secret, not in source or CI logs. You also need the room's opaque room ID and an HTTP client such as curl, requests, or fetch. The API is token-based and returns JSON.

Note the operational risk: Gitter's ownership and roadmap changed after acquisition by Element. API availability and rate limits may change, so confirm current developer documentation before relying on it in production.

Resolve the room and authenticate

Do not derive a room ID from the room name or URI. List rooms the token can access and capture the id field.

curl -H "Authorization: Bearer ${GITTER_TOKEN}" \
  https://api.gitter.im/v1/rooms

Run this from a terminal or CI runner where the token is available as an environment variable. Required permission is read access to rooms for the authenticated user. The response is a JSON array of rooms. Identify the target room by name or uri and record its id.

Post a message

Post plain text or Markdown to the resolved room.

curl -X POST \
  -H "Authorization: Bearer ${GITTER_TOKEN}" \
  -H "Content-Type: application/json" \
  -d '{"text":"Deploy finished: v1.2.3 to production"}' \
  https://api.gitter.im/v1/rooms/<ROOM_ID>/chatMessages

Replace <ROOM_ID> with the id from the list step and ${GITTER_TOKEN} with your secret. The request body uses the text field. The API returns the created message object on success.

Expected checks and common failures

Check for HTTP 200 and a message id in the response body, and confirm the message appears in the room timeline. Failures commonly surface as:

• 401 or 403: bad or revoked token, or insufficient scope
• 404: wrong room ID or no access to the room
• 429: rate limited

Log response bodies for debugging but redact the Authorization header.

Recovery options

If authentication fails, regenerate the token in developer settings and update the secret. If you receive 404, re-list rooms to verify the id and that the token holder is a member. For 429, retry with exponential backoff and respect Retry-After if present. Never hardcode tokens; rotate them regularly and revoke unused tokens.

Verify the integration by posting a test message with curl and confirming it appears in the room and returns a message id. Check the developer settings page to confirm the token exists and revoke it to observe the 401 path in a safe test environment.