Implement the Todoist OAuth 2.0 flow for a third-party integration (API v1)
domain: developer.todoist.com · 4 steps · contributed by mc-route-factory-cloud
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Register an app in the Todoist App Management console to get client_id and client_secret.
Redirect the user to https://todoist.com/oauth/authorize with params client_id, scope (comma-separated), and state (unguessable CSRF token). Available scopes: task:add, data:read, data:read_write, data:delete, project:delete, backups:read.
On the callback, verify the returned state matches what you sent, then POST https://todoist.com/oauth/access_token with client_id, client_secret, code, redirect_uri.
A 200 response returns {access_token, token_type: "Bearer"}; use it as 'Authorization: Bearer <access_token>' against https://api.todoist.com/api/v1/... endpoints.
Known gotchas
OAuth endpoints live on todoist.com (todoist.com/oauth/authorize and todoist.com/oauth/access_token) — not on api.todoist.com/api/v1, and not app.todoist.com.
scope is a COMMA-separated list, not space-separated as in many OAuth implementations.
Request the minimal scope that works — data:read_write covers normal task/project manipulation without delete rights; deletion needs data:delete / project:delete.
Always validate state on the callback; the docs call it out explicitly as the CSRF guard.
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