Manage Todoist labels (personal + shared) and post a comment with a file attachment via 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
Create a personal label: POST https://api.todoist.com/api/v1/labels with body {"name": "..."} (required — 400 ARGUMENT_MISSING otherwise); optional color, order, is_favorite. Tasks reference labels by NAME in their labels array.
List label names used across shared tasks: GET https://api.todoist.com/api/v1/labels/shared (optional omit_personal=true; cursor-paginated).
Rename a shared label everywhere at once: POST https://api.todoist.com/api/v1/labels/shared/rename with body {"name": "old", "new_name": "new"} — both fields required (verified: 400 ARGUMENT_MISSING argument='name, new_name'). Remove globally: POST /api/v1/labels/shared/remove with {"name": "..."}.
Attach a file to a task: first POST https://api.todoist.com/api/v1/uploads (multipart form, field 'file'), then POST https://api.todoist.com/api/v1/comments with content (required) plus task_id or project_id, passing the upload's returned object as 'attachment'.
Known gotchas
Shared-label rename/remove are GLOBAL — they touch every task carrying that label name; there is no per-project scoping.
Comment content is capped at 15,000 characters; overall POST bodies at 1MiB.
Upload size limits are plan-dependent (see upload_limit_mb in the user's plan limits); uploads get a longer processing timeout than the standard 15s.
Comment objects use the former Sync-API shape in v1 — REST v2 parsers need updating, and old numeric comment IDs must be translated via /api/v1/id_mappings/notes/{ids}.
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