Dart has a rich set of core libraries that provide essentials for many everyday
programming tasks such as working on collections of objects
(dart:collection), making calculations (dart:math), and encoding/decoding
data (dart:convert). Additional APIs are available in
community contributed packages.
Multi-platform libraries
The following table lists the Dart core libraries that work on all Dart platforms.
| Library | Notes |
|---|---|
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 Interaction with developer tools such as the debugger and inspector. |
JIT and dartdevc only |
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. |
Native platform libraries
The following table lists the Dart core libraries that work on the Dart native platform (AOT- and JIT-compiled code).
| Library | Notes |
|---|---|
dart:io File, socket, HTTP, and other I/O support for non-web applications. |
|
dart:isolate Concurrent programming using isolates: independent workers similar to threads. |
|
dart:mirrors Basic reflection with support for introspection and dynamic invocation. |
Experimental JIT only (not Flutter) |
Web platform libraries
The following table lists the Dart core libraries that work on the Dart web platform (code compiled to JavaScript).
| Library | Notes |
|---|---|
dart:html HTML elements and other resources for web-based applications. |
|
dart:indexed_db Client-side key-value store with support for indexes. |
|
dart:web_audio High-fidelity audio programming in the browser. |
|
dart:web_gl 3D programming in the browser. |
|
dart:js Don’t use. Instead, use the js package, as described in JavaScript interoperability. |
DEPRECATED |
dart:js_util Don’t use. Instead, use the js package, as described in JavaScript interoperability. |
DEPRECATED |
dart:web_sql API for storing data in the browser that can be queried with SQL. |
DEPRECATED |