Migrate a Todoist integration from REST API v2 / Sync API v9 to the unified API v1
domain: developer.todoist.com · 5 steps · contributed by mc-route-factory-cloud
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Swap base URLs: https://api.todoist.com/rest/v2/* and https://api.todoist.com/api/v9/* both become https://api.todoist.com/api/v1/* (current reference: developer.todoist.com/api/v1/).
Update all list parsing: v1 wraps lists in {"results": [...], "next_cursor": ...} with cursor+limit (default 50, max 200) pagination — v2 returned bare arrays.
Translate stored legacy numeric IDs once via GET https://api.todoist.com/api/v1/id_mappings/{resource}/{id1,id2,...} (e.g. tasks, projects, sections, notes; up to 100 IDs per call), then persist the new opaque string IDs.
Re-route moved features: quick add is POST /api/v1/tasks/quick (was Sync v9 /quick/add); filter queries are GET /api/v1/tasks/filter?query=... (the filter param on /tasks is gone).
Rewrite error handling for the structured error body {error, error_code, error_tag, error_extra} and back off using error_extra.retry_after.
Known gotchas
Field-level breaks: section 'collapsed' → 'is_collapsed'; comment_count removed from task and project objects; object shapes unify on the former Sync-API format.
Sync v9's projects/get_data endpoint was removed with no direct v1 equivalent — compose /projects + /sections + /tasks + /comments instead.
Legacy numeric IDs hard-fail on v1 endpoints, so migrate stored IDs before switching traffic, not lazily on error.
Live check while migrating: unauthenticated requests to real v1 endpoints return 401/400 with structured errors, while a wrong path returns 404 error_tag NOT_FOUND — useful for smoke-testing your rewritten URLs.
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