Dart - Dart API docs Welcome! Welcome to the Dart API reference documentation, covering the Dart core libraries. These include: dart:core: Core functionality such as strings, numbers, collections, errors, dates, and URIs. dart:io: I/O for non-web apps. dart:async: Functionality for asynchronous programming with futures, streams, and zones. You'll also find reference documentation covering Dart's various platform interoperability options, such as: dart:js_interop: Library including a sound type hierarchy and helper functions for interoperability with JavaScript. package:web: DOM manipulation for web apps. dart:ffi: Foreign function interfaces for interoperability with the C language. The core libraries - except for dart:core - must be imported before they're available for use: import 'dart:math'; Additionally, you can find Dart packages at pub.dev. Language docs The main site for learning and using Dart is dart.dev. Check out these pages: Dart overview Dart language documentation Library tour Tutorials This API reference is generated from the SDK source at dart-lang/sdk. If you'd like to give feedback on 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:ffi Foreign Function Interface for interoperability with the C programming language. 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 package:web open_in_new This package exposes browser APIs. It's intended to replace dart:html and similar Dart SDK libraries. It will support access to browser APIs from Dart code compiled to either JavaScript or WebAssembly. dart:js_interop Interoperability, "interop" for short, with JavaScript and browser APIs. dart:js_interop_unsafe Utility methods to manipulate JavaScript objects dynamically. Web (Legacy) 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 Low-level support for interoperating with JavaScript. dart:js_util Utility methods to manipulate package:js annotated JavaScript interop objects in cases where the name to call is not known at runtime. 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.