Welcome to the Dart API reference documentation, covering the core Dart API libraries. Some of the most fundamental Dart libraries include:

- dart:core: Core functionality such as strings, numbers, collections, errors, dates, and URIs.
- dart:html: DOM manipulation for web apps (available only to web apps).
- dart:io: I/O for non-web apps.

Except for `dart:core`, you must import a library before you can use it. Here's an example of importing `dart:async` and `dart:math`:

    import 'dart:async';
    import 'dart:math';

You can install more libraries using the pub package manager.

The main site for learning and using Dart is dart.dev. Check out these pages:

- Platforms
- Language tour
- Library tour
- Sample code

This API reference is automatically generated from source code in the Dart SDK project. If you'd like to give feedback or edit this documentation, see Contributing.

## Libraries

### Core

dart:async
  Support for asynchronous programming, with classes such as Future and Stream. [...]
dart:collection
  Classes and utilities that supplement the collection support in dart:core. [...]
dart:convert
  Encoders and decoders for converting between different data representations, including JSON and UTF-8. [...]
dart:core
  Built-in types, collections, and other core functionality for every Dart program. [...]
dart:developer
  Interact with developer tools such as the debugger and inspector. [...]
dart:math
  Mathematical constants and functions, plus a random number generator. [...]
dart:typed_data
  Lists that efficiently handle fixed sized data (for example, unsigned 8 byte integers) and SIMD numeric types. [...]

### VM

dart:cli
dart:io
  File, socket, HTTP, and other I/O support for non-web applications. [...]
dart:isolate
  Concurrent programming using isolates: independent workers that are similar to threads but don't share memory, communicating only via messages. [...]
dart:mirrors
  Basic reflection in Dart, with support for introspection and dynamic invocation. [...]

### Web

dart:html
  HTML elements and other resources for web-based applications that need to interact with the browser and the DOM (Document Object Model). [...]
dart:indexed_db
  A client-side key-value store with support for indexes. [...]
dart:js
  Support for interoperating with JavaScript. [...]
dart:js_util
  Utility methods to efficiently manipulate typed JSInterop objects in cases where the name to call is not known at runtime. You should only use these methods when the same effect cannot be achieved with @JS annotations. These methods would be extension methods on JSObject if Dart supported extension methods.
dart:svg
  Scalable Vector Graphics: Two-dimensional vector graphics with support for events and animation. [...]
dart:web_audio
  High-fidelity audio programming in the browser.
dart:web_gl
  3D programming in the browser.
dart:web_sql
  An API for storing data in the browser that can be queried with SQL. [...]