jsonpost
Code Generation

JSON to Dart Class Generator

Generate null-safe Dart classes with fromJson/toJson methods for Flutter apps.

Runs entirely in your browser — your data never leaves your device.

Loading tool…

How to use this tool

  1. 1Paste your JSON sample into the editor.
  2. 2Set the root class name.
  3. 3Copy the generated Dart classes.

Frequently asked questions

Are fromJson and toJson included?
Yes. The generated classes include serialization methods so they work with Dart's jsonDecode/jsonEncode.
Is the output null-safe?
Yes. The generated Dart is compatible with sound null safety.
Is my data uploaded to a server?
No. Every tool on JSONPost runs entirely in your browser using JavaScript. Your JSON never leaves your device, so it is safe to use with private or sensitive data.

Related tools

JSON to Kotlin Data Class Generator

Turn JSON into Kotlin data classes with nullable types and serialization annotations.

JSON to Swift Struct Generator

Generate Codable Swift structs from JSON with CodingKeys for snake_case mapping.

JSON to TypeScript Generator

Paste JSON and instantly generate accurate TypeScript interfaces, including nested and optional fields.