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.DART·File Extension

DART Data & Text — A .dart file is a DART Data & Text. It is a text-based data format widely used for configuration files, data interchange and API payloads.

Data & Textapplication/vnd.dartCompressible

Quick facts

Extension.dart

File typeDART Data & Text

MIME typeapplication/vnd.dart

CategoryData & Text

Charset—

CompressibleYes

What is .dart

What is a .dart file?

A .dart file is a DART Data & Text. It is a text-based data format widely used for configuration files, data interchange and API payloads.

In the mime-db registry it maps to application/vnd.dart, and it is marked as compressible. When serving .dart over HTTP, set the Content-Type header as shown in Developer info below.

Related entities: it maps to application/vnd.dart and is used by Dart among others — and is delivered over HTTP via the Content-Type header.

How to open .dart files

Use VS Code or Notepad++ to open and edit .dart files.
Any text editor (Notepad, VS Code) can inspect the raw content as text.

Developer info

When served over HTTP, responses should set the following header:

Content-Type: application/vnd.dart

Common software that reads/writes .dart:

VS CodeNotepad++Sublime Textjq

Relation chain

.dartextension of

format

DART Data & Textserved as

mime type

application/vnd.dartsent via header

http header

Related extensions

Related MIME types

Related programming languages

Dart

.dart

Common uses

Configuration files
Data interchange between systems
API request and response payloads
Logs and data exports

How to edit .dart files

Open the file with VS Code, make your changes and save.
Most editors preserve the original formatting and encoding — avoid changing the charset.

How to create .dart files

Create a new file and save it with the .dart extension, or export this format from VS Code.

Frequently asked questions

What programs can open .dart files?

Common options include VS Code, Notepad++, Sublime Text. You can also open many of these files with built-in viewers or a browser.

How do I create a .dart file?

Create a new file in any text editor or the app that owns the format and save it with the .dart extension.

What is the relationship between .dart and the application/vnd.dart MIME type?

application/vnd.dart is the media type identifier used for .dart files during network transfer (for example in the HTTP Content-Type header).

Sources & standards

Updated 2026-09-13

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