final client = Client() .setEndpoint('https://.cloud.appwrite.io/v1') .setProject('[PROJECT_ID]');


### Server-side (Dart)

```dart
import 'package:dart_appwrite/dart_appwrite.dart';

final client = Client()
    .setEndpoint('https://<REGION>.cloud.appwrite.io/v1')
    .setProject(Platform.environment['APPWRITE_PROJECT_ID']!)
    .setKey(Platform.environment['APPWRITE_API_KEY']!);

Code Examples

Authentication (client-side)

final account = Account(client);

// Signup
await account.create(userId: ID.unique(), email: 'user@example.com', password: 'password123', name: 'User Name');

// Login
final session = await account.createEmailPasswordSession(email: 'user@example.com', password: 'password123');

// OAuth login
await account.createOAuth2Session(provider: OAuthProvider.google);

// Get current user
final user = await account.get();

// Logout
await account.deleteSession(sessionId: 'current');

User Management (server-side)

final users = Users(client);

// Create user
final user = await users.create(userId: ID.unique(), email: 'user@example.com', password: 'password123', name: 'User Name');

// List users
final list = await users.list(queries: [Query.limit(25)]);

// Get user
final fetched = await users.get(userId: '[USER_ID]');

// Delete user
await users.delete(userId: '[USER_ID]');

Database Operations

Note: Use TablesDB (not the deprecated Databases class) for all new code. Only use Databases if the existing codebase already relies on it or the user explicitly requests it.

Tip: Prefer named parameters (e.g., databaseId: '...') for all SDK method calls. Only use positional arguments if the existing codebase already uses them or the user explicitly requests it.

final tablesDB = TablesDB(client);

// Create database (server-side only)
final db = await tablesDB.create(databaseId: ID.unique(), name: 'My Database');

// Create table (server-side only)
final col = await tablesDB.createTable(databaseId: '[DATABASE_ID]', tableId: ID.unique(), name: 'My Table');

// Create row
final doc = await tablesDB.createRow(
    databaseId: '[DATABASE_ID]',
    tableId: '[TABLE_ID]',
    rowId: ID.unique(),
    data: {'title': 'Hello', 'done': false},
);

// Query rows
final results = await tablesDB.listRows(
    databaseId: '[DATABASE_ID]',
    tableId: '[TABLE_ID]',
    queries: [Query.equal('done', false), Query.limit(10)],
);

// Get row
final row = await tablesDB.getRow(databaseId: '[DATABASE_ID]', tableId: '[TABLE_ID]', rowId: '[ROW_ID]');

// Update row
await tablesDB.updateRow(
    databaseId: '[DATABASE_ID]',
    tableId: '[TABLE_ID]',
    rowId: '[ROW_ID]',
    data: {'done': true},
);

// Delete row
await tablesDB.deleteRow(
    databaseId: '[DATABASE_ID]',
    tableId: '[TABLE_ID]',
    rowId: '[ROW_ID]',
);

String Column Types

Note: The legacy string type is deprecated. Use explicit column types for all new columns.

Type	Max characters	Indexing	Storage
`varchar`	16,383	Full index (if size ≤ 768)	Inline in row
`text`	16,383	Prefix only	Off-page
`mediumtext`	4,194,303	Prefix only	Off-page
`longtext`	1,073,741,823	Prefix only	Off-page

varchar is stored inline and counts towards the 64 KB row size limit. Prefer for short, indexed fields like names, slugs, or identifiers.
text, mediumtext, and longtext are stored off-page (only a 20-byte pointer lives in the row), so they don't consume the row size budget. size is not required for these types.

// Create table with explicit string column types
await tablesDB.createTable(
    databaseId: '[DATABASE_ID]',
    tableId: ID.unique(),
    name: 'articles',
    columns: [
        {'key': 'title',    'type': 'varchar',    'size': 255, 'required': true},   // inline, fully indexable
        {'key': 'summary',  'type': 'text',                    'required': false},  // off-page, prefix index only
        {'key': 'body',     'type': 'mediumtext',              'required': false},  // up to ~4 M chars
        {'key': 'raw_data', 'type': 'longtext',                'required': false},  // up to ~1 B chars
    ],
);

Query Methods

// Filtering
Query.equal('field', 'value')             // == (or pass list for IN)
Query.notEqual('field', 'value')          // !=
Query.lessThan('field', 100)              // <
Query.lessThanEqual('field', 100)         // <=
Query.greaterThan('field', 100)           // >
Query.greaterThanEqual('field', 100)      // >=
Query.between('field', 1, 100)            // 1 <= field <= 100
Query.isNull('field')                     // is null
Query.isNotNull('field')                  // is not null
Query.startsWith('field', 'prefix')       // starts with
Query.endsWith('field', 'suffix')         // ends with
Query.contains('field', 'sub')            // contains
Query.search('field', 'keywords')         // full-text search (requires index)

// Sorting
Query.orderAsc('field')
Query.orderDesc('field')

// Pagination
Query.limit(25)                           // max rows (default 25, max 100)
Query.offset(0)                           // skip N rows
Query.cursorAfter('[ROW_ID]')             // cursor pagination (preferred)
Query.cursorBefore('[ROW_ID]')

// Selection & Logic
Query.select(['field1', 'field2'])        // return only specified fields
Query.or([Query.equal('a', 1), Query.equal('b', 2)])   // OR
Query.and([Query.greaterThan('age', 18), Query.lessThan('age', 65)])  // AND (default)

File Storage

final storage = Storage(client);

// Upload file
final file = await storage.createFile(
    bucketId: '[BUCKET_ID]',
    fileId: ID.unique(),
    file: InputFile.fromPath(path: '/path/to/file.png', filename: 'file.png'),
);

// Get file preview
final preview = storage.getFilePreview(bucketId: '[BUCKET_ID]', fileId: '[FILE_ID]', width: 300, height: 300);

// List files
final files = await storage.listFiles(bucketId: '[BUCKET_ID]');

// Delete file
await storage.deleteFile(bucketId: '[BUCKET_ID]', fileId: '[FILE_ID]');

InputFile Factory Methods

// Client-side (Flutter)
InputFile.fromPath(path: '/path/to/file.png', filename: 'file.png')    // from path
InputFile.fromBytes(bytes: uint8List, filename: 'file.png')            // from Uint8List

// Server-side (Dart)
InputFile.fromPath(path: '/path/to/file.png', filename: 'file.png')
InputFile.fromBytes(bytes: uint8List, filename: 'file.png')

Teams

final teams = Teams(client);

// Create team
final team = await teams.create(teamId: ID.unique(), name: 'Engineering');

// List teams
final list = await teams.list();

// Create membership (invite user by email)
final membership = await teams.createMembership(
    teamId: '[TEAM_ID]',
    roles: ['editor'],
    email: 'user@example.com',
);

// List memberships
final members = await teams.listMemberships(teamId: '[TEAM_ID]');

// Update membership roles
await teams.updateMembership(teamId: '[TEAM_ID]', membershipId: '[MEMBERSHIP_ID]', roles: ['admin']);

// Delete team
await teams.delete(teamId: '[TEAM_ID]');

Role-based access: Use Role.team('[TEAM_ID]') for all team members or Role.team('[TEAM_ID]', 'editor') for a specific team role when setting permissions.

Real-time Subscriptions (client-side)

final realtime = Realtime(client);

// Subscribe to row changes
final subscription = realtime.subscribe([
    Channel.tablesdb('[DATABASE_ID]').table('[TABLE_ID]').row(),
]);
subscription.stream.listen((response) {
    print(response.events);   // e.g. ['tablesdb.*.tables.*.rows.*.create']
    print(response.payload);  // the affected resource
});

// Subscribe to multiple channels
final multi = realtime.subscribe([
    Channel.tablesdb('[DATABASE_ID]').table('[TABLE_ID]').row(),
    Channel.bucket('[BUCKET_ID]').file(),
]);

// Cleanup
subscription.close();

Available channels:

Channel	Description
`account`	Changes to the authenticated user's account
`tablesdb.[DB_ID].tables.[TABLE_ID].rows`	All rows in a table
`tablesdb.[DB_ID].tables.[TABLE_ID].rows.[ROW_ID]`	A specific row
`buckets.[BUCKET_ID].files`	All files in a bucket
`buckets.[BUCKET_ID].files.[FILE_ID]`	A specific file
`teams`	Changes to teams the user belongs to
`teams.[TEAM_ID]`	A specific team
`memberships`	The user's team memberships
`memberships.[MEMBERSHIP_ID]`	A specific membership
`functions.[FUNCTION_ID].executions`	Function execution updates

Response fields: events (array), payload (resource), channels (matched), timestamp (ISO 8601).

Serverless Functions (server-side)

final functions = Functions(client);

// Execute function
final execution = await functions.createExecution(functionId: '[FUNCTION_ID]', body: '{"key": "value"}');

// List executions
final executions = await functions.listExecutions(functionId: '[FUNCTION_ID]');

Writing a Function Handler (Dart runtime)

// lib/main.dart — Appwrite Function entry point
Future<dynamic> main(final context) async {
    // context.req.body        — raw body (String)
    // context.req.bodyJson    — parsed JSON (Map or null)
    // context.req.headers     — headers (Map)
    // context.req.method      — HTTP method
    // context.req.path        — URL path
    // context.req.query       — query params (Map)

    context.log('Processing: ${context.req.method} ${context.req.path}');

    if (context.req.method == 'GET') {
        return context.res.json({'message': 'Hello from Appwrite Function!'});
    }

    return context.res.json({'success': true});      // JSON
    // return context.res.text('Hello');              // plain text
    // return context.res.empty();                    // 204
    // return context.res.redirect('https://...');    // 302
}

Server-Side Rendering (SSR) Authentication

SSR apps using server-side Dart (Dart Frog, Shelf, etc.) use the server SDK (dart_appwrite) to handle auth. You need two clients:

Admin client — uses an API key, creates sessions, bypasses rate limits (reusable singleton)
Session client — uses a session cookie, acts on behalf of a user (create per-request, never share)

import 'package:dart_appwrite/dart_appwrite.dart';

// Admin client (reusable)
final adminClient = Client()
    .setEndpoint('https://<REGION>.cloud.appwrite.io/v1')
    .setProject('[PROJECT_ID]')
    .setKey(Platform.environment['APPWRITE_API_KEY']!);

// Session client (create per-request)
final sessionClient = Client()
    .setEndpoint('https://<REGION>.cloud.appwrite.io/v1')
    .setProject('[PROJECT_ID]');

final session = request.cookies['a_session_[PROJECT_ID]'];
if (session != null) {
    sessionClient.setSession(session);
}

Email/Password Login

final account = Account(adminClient);
final session = await account.createEmailPasswordSession(
    email: body['email'],
    password: body['password'],
);

// Cookie name must be a_session_<PROJECT_ID>
response.headers.add('Set-Cookie',
    'a_session_[PROJECT_ID]=${session.secret}; '
    'HttpOnly; Secure; SameSite=Strict; '
    'Expires=${HttpDate.format(DateTime.parse(session.expire))}; Path=/');

Authenticated Requests

final session = request.cookies['a_session_[PROJECT_ID]'];
if (session == null) {
    return Response(statusCode: 401, body: 'Unauthorized');
}

final sessionClient = Client()
    .setEndpoint('https://<REGION>.cloud.appwrite.io/v1')
    .setProject('[PROJECT_ID]')
    .setSession(session);

final account = Account(sessionClient);
final user = await account.get();

OAuth2 SSR Flow

// Step 1: Redirect to OAuth provider
final account = Account(adminClient);
final redirectUrl = await account.createOAuth2Token(
    provider: OAuthProvider.github,
    success: 'https://example.com/oauth/success',
    failure: 'https://example.com/oauth/failure',
);
return Response(statusCode: 302, headers: {'Location': redirectUrl});

// Step 2: Handle callback — exchange token for session
final account = Account(adminClient);
final session = await account.createSession(
    userId: request.uri.queryParameters['userId']!,
    secret: request.uri.queryParameters['secret']!,
);
// Set session cookie as above

Cookie security: Always use HttpOnly, Secure, and SameSite=Strict to prevent XSS. The cookie name must be a_session_<PROJECT_ID>.

Forwarding user agent: Call sessionClient.setForwardedUserAgent(request.headers['user-agent']) to record the end-user's browser info for debugging and security.

Error Handling

import 'package:appwrite/appwrite.dart';
// AppwriteException is included in the main import

try {
    final row = await tablesDB.getRow(databaseId: '[DATABASE_ID]', tableId: '[TABLE_ID]', rowId: '[ROW_ID]');
} on AppwriteException catch (e) {
    print(e.message);    // human-readable message
    print(e.code);       // HTTP status code (int)
    print(e.type);       // error type (e.g. 'document_not_found')
    print(e.response);   // full response body (Map)
}

Common error codes:

Code	Meaning
`401`	Unauthorized — missing or invalid session/API key
`403`	Forbidden — insufficient permissions
`404`	Not found — resource does not exist
`409`	Conflict — duplicate ID or unique constraint
`429`	Rate limited — too many requests

Permissions & Roles (Critical)

Appwrite uses permission strings to control access to resources. Each permission pairs an action (read, update, delete, create, or write which grants create + update + delete) with a role target. By default, no user has access unless permissions are explicitly set at the document/file level or inherited from the collection/bucket settings. Permissions are arrays of strings built with the Permission and Role helpers.

import 'package:appwrite/appwrite.dart';
// Permission and Role are included in the main package import

Database Row with Permissions

final doc = await tablesDB.createRow(
    databaseId: '[DATABASE_ID]',
    tableId: '[TABLE_ID]',
    rowId: ID.unique(),
    data: {'title': 'Hello World'},
    permissions: [
        Permission.read(Role.user('[USER_ID]')),     // specific user can read
        Permission.update(Role.user('[USER_ID]')),   // specific user can update
        Permission.read(Role.team('[TEAM_ID]')),     // all team members can read
        Permission.read(Role.any()),                 // anyone (including guests) can read
    ],
);

File Upload with Permissions

final file = await storage.createFile(
    bucketId: '[BUCKET_ID]',
    fileId: ID.unique(),
    file: InputFile.fromPath(path: '/path/to/file.png', filename: 'file.png'),
    permissions: [
        Permission.read(Role.any()),
        Permission.update(Role.user('[USER_ID]')),
        Permission.delete(Role.user('[USER_ID]')),
    ],
);

When to set permissions: Set document/file-level permissions when you need per-resource access control. If all documents in a collection share the same rules, configure permissions at the collection/bucket level and leave document permissions empty.

Common mistakes:

Forgetting permissions — the resource becomes inaccessible to all users (including the creator)

Role.any() with write/update/delete — allows any user, including unauthenticated guests, to modify or remove the resource

Permission.read(Role.any()) on sensitive data — makes the resource publicly readable

dart

Appwrite Dart SDK

Installation

Setting Up the Client

Client-side (Flutter)