# API

REST under `/api/v1`, JSON in and out. Everything the web interface does goes
through it, so anything you can do there you can script.

## Authenticating

Two ways, accepted everywhere.

**A session cookie**, which the web interface uses. `httpOnly`, so nothing but the
browser handles it.

**A personal API token**, which is what scripts use:

```bash
curl -H "Authorization: Bearer vrd_..." https://todo.example.dk/api/v1/tasks
```

Make one under **Settings → API tokens**. It carries your permissions exactly —
there is no separate service identity.

## The machine-readable spec

[`openapi.yaml`](openapi.yaml) describes the same API as an OpenAPI 3.1 document —
for generating a client, for importing into Bruno or Insomnia, or for reading in a
tool that renders it.

It is written by hand, and a test walks the router on every build and fails if an
endpoint is routed but not described, or described but no longer routed. So it is
as current as this page is, which is to say: as current as CI is green.

## Errors

Every failure has the same shape:

```json
{
  "code": "validation_failed",
  "error": "one or more fields are not valid",
  "fields": { "due_date": "must be a date like 2026-03-15" }
}
```

`code` is stable and meant to be matched on. `error` is English prose for a log —
what a person reads is decided by the client, which knows what language they are in.

| Code | Status | Means |
|---|---|---|
| `bad_request` | 400 | The body could not be read. |
| `unauthorized` | 401 | Not signed in, or the token is wrong. |
| `totp_required` | 401 | The login still needs its verification code. |
| `forbidden` | 403 | Cross-site request, or admin needed. |
| `not_found` | 404 | Does not exist, or you cannot see it. |
| `conflict` | 409 | Already exists, or the state does not allow it. |
| `gmail_not_configured` | 409 | No Google OAuth client is registered on this server. |
| `ai_not_configured` | 409 | No AI provider has been set up. |
| `totp_not_enabled` | 409 | Two-factor is off, and the request needs it on. |
| `inbox_protected` | 409 | The Inbox cannot be deleted. |
| `validation_failed` | 422 | Check `fields`. |
| `rate_limited` | 429 | Too many attempts. |
| `internal_error` | 500 | Our fault. |

!!! note "404 rather than 403"
    Anything you may not see answers 404. A 403 would confirm the thing exists,
    which is what somebody trying ids is hoping to learn.

## The endpoints

### Tasks

| Method | Path | |
|---|---|---|
| `GET` | `/tasks` | List. Filter with `project_id`, `label_id`, `priority`, `due_before`, `due_from`, `no_date`, `assignee_id=me`, `q`, `completed=include\|only`. |
| `POST` | `/tasks` | Create. |
| `POST` | `/tasks/quick-add` | Create from one line of natural language. |
| `GET` | `/tasks/quick-add/preview?text=` | Parse without saving. |
| `GET` | `/tasks/{id}` | One task. |
| `PATCH` | `/tasks/{id}` | Change it. Only the fields you send. |
| `DELETE` | `/tasks/{id}` | To the trash, recoverable for 30 days. |
| `POST` | `/tasks/{id}/complete` | Tick off. A repeating task advances instead. |
| `POST` | `/tasks/{id}/reopen` | Un-tick. |
| `POST` | `/tasks/{id}/move` | Reorder: `{"after_id": …, "before_id": …}`. |

```bash
curl -X POST https://todo.example.dk/api/v1/tasks/quick-add \
  -H "Authorization: Bearer vrd_..." \
  -H "Content-Type: application/json" \
  -d '{"text": "file the VAT return tomorrow at 10am p1 #Accounts @tax"}'
```

### Projects and sections

| Method | Path | |
|---|---|---|
| `GET` `POST` | `/projects` | List, create. |
| `GET` `PATCH` `DELETE` | `/projects/{id}` | Read, change, trash. Owner only for the last two. |
| `GET` `POST` | `/projects/{id}/sections` | |
| `PATCH` `DELETE` | `/sections/{id}` | |
| `GET` | `/projects/{id}/members` | Who is on it, who can be added (`candidates`), and who has been invited and not arrived (`pending`). |
| `POST` | `/projects/{id}/invites` | Share it. `{"user_id": …}` for somebody who already has an account here, `{"email": …}` for anybody else — plus `"role": "editor"\|"viewer"`. An address that turns out to belong to an account is that account. |
| `DELETE` | `/projects/{id}/invites/{inviteID}` | Withdraw an invitation before it is used. |
| `PATCH` `DELETE` | `/projects/{id}/members/{userID}` | Change somebody's role, or take them off. |
| `GET` | `/projects/{id}/activity` | |
| `GET` | `/trash/projects` | What you have deleted and can still bring back, with how long is left. |
| `POST` | `/trash/projects/{id}/restore` | Brings it back with the tasks that went with it. |

### Views, filters and labels

| Method | Path | |
|---|---|---|
| `GET` | `/today` | Overdue and due today, in your timezone. |
| `GET` | `/upcoming?days=7` | One entry per day, empty days included. Up to 31; over that is capped. |
| `GET` | `/search?q=` | Across everything you can see. |
| `GET` `POST` | `/filters` | |
| `GET` | `/filters/{id}/tasks` | Run one. |
| `GET` | `/filters/preview?query=` | Run an expression without saving it. |
| `GET` `POST` | `/labels` | |

### Comments and attachments

| Method | Path | |
|---|---|---|
| `GET` `POST` | `/tasks/{id}/comments` | |
| `PATCH` `DELETE` | `/comments/{id}` | Author only for editing. |
| `POST` | `/tasks/{id}/attachments` | `multipart/form-data`, field `file`, 25 MB. |
| `GET` `DELETE` | `/attachments/{id}` | |

### Import and export

| Method | Path | |
|---|---|---|
| `POST` | `/import/todoist` | A Todoist CSV, `multipart/form-data`. |
| `POST` | `/import/csv` | Mapped rows as JSON. |
| `GET` | `/export/account` | Everything, as JSON. |
| `GET` | `/export/projects/{id}.csv` | Todoist-compatible. |
| `GET` | `/export/projects/{id}.ics` | A calendar file. |

### API tokens

| Method | Path | |
|---|---|---|
| `GET` `POST` | `/tokens` | List, or mint one. `name` is required; `expires_in_days` is optional, and `0` means it never expires. |
| `DELETE` | `/tokens/{id}` | Revoked immediately. |

The plaintext token comes back from `POST` and never again — only its hash is
stored. The listing shows a `prefix`, which is enough to tell two of your own
tokens apart.

!!! warning "These three need a signed-in session"
    A bearer token is refused here with `403`, even though it is accepted
    everywhere else. Otherwise a leaked token would be permanent: whoever had it
    could issue a second one, and revoking the first would change nothing.

### Everything else

| Method | Path | |
|---|---|---|
| `GET` | `/ws` | WebSocket. Live changes to projects you can see. |
| `GET` | `/notifications` | |
| `GET` `POST` | `/feed`, `/feed/rotate` | The [calendar feed](caldav.md) URL. |
| `GET` `POST` | `/mail-address`, `/mail-address/rotate` | The [mail-to-task](mail.md) address. |
| `POST` | `/mcp` | The [MCP](mcp.md) endpoint. |
| `GET` | `/healthz` | Unauthenticated. Reads the database rather than merely answering. |

## Live updates

```javascript
const socket = new WebSocket('wss://todo.example.dk/api/v1/ws');
socket.onmessage = (event) => {
  const { type, project_id, payload } = JSON.parse(event.data);
  // task.created, task.updated, task.completed, task.deleted,
  // task.moved, comment.created, notification, reminder
};
```

One-way by design: nothing a client sends over the socket changes anything. Writes
go through the REST API, where the permission checks are.

## Rate limits

Only where guessing matters: ten login attempts per address per fifteen minutes,
five password-reset requests per hour. The rest of the API is not limited — it is
your server.