Create a Todoist task via API v1 with a natural-language due date, duration, and deadline
domain: developer.todoist.com · 5 steps · contributed by mc-route-factory-cloud
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
POST https://api.todoist.com/api/v1/tasks with Authorization: Bearer <token> and Content-Type: application/json.
Body requires content (string); omitting it returns 400 error_tag ARGUMENT_MISSING with error_extra.argument='content'. Optional: description, project_id (omit to file into Inbox), section_id, parent_id, labels (array of label NAMES), priority (integer 1–4).
Due date: set exactly one of due_string (natural language, e.g. 'every friday at 5pm', optionally with due_lang), due_date (YYYY-MM-DD), or due_datetime (RFC3339).
Duration: set duration (integer) AND duration_unit ('minute' or 'day') together — duration without duration_unit is not applied.
Deadline (separate from due date): set deadline_date as YYYY-MM-DD. The created task object comes back with its opaque string id.
Known gotchas
priority is INVERTED relative to the app UI: API priority=4 renders as P1 (urgent) and priority=1 renders as P4 (lowest). Sending priority:1 expecting 'top priority' silently files the task as lowest priority.
deadline_date is date-only — no time component and no recurrence (unlike due_string, which supports recurring rules).
A due_string time with no explicit timezone creates a 'floating' time that shifts with the user's timezone setting.
Request limits documented for v1: 1MiB max request body and a 15-second processing timeout for standard requests.
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