{"slug":"mattermost-api","name":"Mattermost API","host":"*.cloud.mattermost.com","site":"https://mattermost.com","category":"communication","docsUrl":null,"sources":[{"kind":"changelog","url":"https://docs.mattermost.com/product-overview/deprecated-features.html"}],"url":"https://www.okapi.bot/providers/mattermost-api/","json":"https://www.okapi.bot/api/v1/providers/mattermost-api.json","breakingChanges":[{"slug":"post-api-v4-teams-import-stops-working","api":"mattermost-api","title":"POST /api/v4/teams/{}/import stops working","kind":"removal","outcome":"fails","model":null,"announcedAt":"2026-10-01","effectiveAt":"2026-10-01","scope":null,"calls":["POST /api/v4/teams/{}/import"],"method":"POST","path":"/api/v4/teams/{}/import","source":{"url":"https://docs.mattermost.com/product-overview/deprecated-features.html","kind":"archive"},"quote":"The built-in Slack import API and CLI have been removed. The POST /teams/{team_id}/import endpoint and the mattermost import slack command are no longer available. Use the mmetl tool with mmctl import instead.","migration":"Convert the Slack export with the mmetl tool and import it with mmctl import (POST /api/v4/imports and the import job API).","migrationChange":null,"needsDecision":null,"text":{"summary":"On October 1, 2026, the POST /api/v4/teams/{}/import endpoint was removed. Calls to this endpoint now fail. The built-in Slack import API and CLI are no longer available.","migration":"Convert the Slack export with the mmetl tool and import it with mmctl import, which uses POST /api/v4/imports and the import job API.","by":"writer"},"publishedAt":"2026-10-23T10:10:55.131Z","updatedAt":"2026-10-23T18:51:03.809Z","status":"in_effect","tone":"broken","url":"https://www.okapi.bot/providers/mattermost-api/breaking-changes/post-api-v4-teams-import-stops-working/"},{"slug":"post-api-v4-teams-channels-search-archived-is-deprecated","api":"mattermost-api","title":"POST /api/v4/teams/{}/channels/search_archived is deprecated","kind":"removal","outcome":"fails","model":null,"announcedAt":"2025-10-01","effectiveAt":null,"scope":null,"calls":["POST /api/v4/teams/{}/channels/search_archived"],"method":"POST","path":"/api/v4/teams/{}/channels/search_archived","source":{"url":"https://docs.mattermost.com/product-overview/deprecated-features.html","kind":"archive"},"quote":"has been deprecated in favour of /api/v4/channels/search with the deleted parameter.","migration":"Call POST /api/v4/channels/search with the deleted parameter set to true.","migrationChange":null,"needsDecision":null,"text":null,"publishedAt":"2026-10-23T10:10:55.131Z","updatedAt":"2026-10-23T10:10:55.131Z","status":"deprecated","tone":"deprecated","url":"https://www.okapi.bot/providers/mattermost-api/breaking-changes/post-api-v4-teams-channels-search-archived-is-deprecated/"}]}