Use this page to find the formal Dart language specification. For a gentler introduction to Dart, see the language tour.

The Dart 3 language specification is in progress. You can find the in-progress specification in PDF format:

• Latest, in-progress specification (produced from a LaTeX file)

New language features are typically described using informal language feature specifications in the dart-lang/language repo:

• Accepted informal proposals
• Drafts of potential features

:::version-note Dart 3 changed the Dart language in a few ways, primarily requiring sound null safety. :::

The Dart 2 language specification is available in PDF format:

• Formal specification (Dart 2.10)

For information on Dart versions 2.12 and later, which have support for null safety, check out the in-progress Dart 3 specification.

The formal Dart 1.x language specification is available from the Ecma International website:

• Dart Programming Language Specification, 4^th Edition