Convert

JSON to Dart

Generate Dart classes from JSON with named constructors. Ready for Flutter model classes.

Root name

JSON input

Dart types

class Profile {
  final String email;
  final bool verified;

  Profile({
    required this.email,
    required this.verified,
  });
}

class Root {
  final int id;
  final String name;
  final List<String> roles;
  final Profile profile;

  Root({
    required this.id,
    required this.name,
    required this.roles,
    required this.profile,
  });
}

Why use our JSON to Dart?

100% private

Everything runs in your browser. Your data never leaves your device — safe for production payloads.

Instant results

No round trips, no rate limits, no login. Format, validate and inspect megabytes of JSON in milliseconds.

Standards-first

Follows RFC 8259 / ECMA-404 exactly. Reports errors with precise line and column diagnostics.

JSON to C#

Generate C# classes with auto-properties from JSON. Nullable reference types for missing values. Newtonsoft-ready.

JSON to Java

Generate Java POJO classes from JSON. Boxed types for optional fields — safe for Jackson / Gson serialization.

JSON to Kotlin

Generate Kotlin data classes from JSON. Nullable types inferred, ready for kotlinx.serialization or Moshi.

JSON to CSV Converter

Convert JSON arrays to CSV rows with automatic header detection and configurable delimiters.

JSON to Go

Generate Go structs with JSON tags from any JSON sample. Handles nested objects, arrays and slices automatically.

JSON to Python

Generate Python dataclasses from JSON. Emits Optional[] for nullable fields and type-safe field annotations.

Related reading

Deep-dive guides that pair well with the JSON to Dart.

Guides

What is JSON? A developer's introduction

Understand the JSON data format, its history, and why it dominates modern APIs and configuration files.

Comparisons

JSON vs XML: which should you use?

Compare readability, verbosity, tooling, schema support and performance between JSON and XML in modern systems.

Developer Tips

10 common JSON errors and how to fix them

Every JSON syntax error you'll ever see — trailing commas, unquoted keys, bad escapes — with a working repair strategy.