JSON to Dart

Generate Dart/Flutter model classes from JSON with fromJson and toJson methods. Handles nested objects and arrays.

fromJson/toJsonNested ObjectsFlutter Ready

How It Works

Paste JSON

Paste your JSON data in the input.

View Classes

See generated Dart classes with methods.

Copy Code

Copy the Dart code to your Flutter project.

Frequently Asked Questions

Does it handle nested JSON objects?

Yes. Nested objects are automatically converted to separate Dart classes with proper references and fromJson/toJson methods.

Are arrays supported?

Yes. Arrays are converted to List<Type> in Dart. Nested object arrays generate their own class definitions.

Can I customize the root class name?

Yes. Use the root class name input to set your preferred name. All generated classes use PascalCase naming.

What this tool does

Data converter tools transform structured data between JSON, CSV, YAML, XML, TOML, SQL, TypeScript interfaces, Go structs, and more. They handle nested objects, arrays, and type inference automatically.

Why use this tool

APIs return JSON, spreadsheets export CSV, infrastructure config uses YAML, and legacy systems speak XML. Being able to convert between these formats without writing a custom script saves hours of tedious data wrangling.

How it works

The tool parses your input format into an in-memory object tree, then serializes that tree into the target format. Type information (string, number, boolean) is inferred from values and mapped to the closest equivalent in the output format.

Pro tip

When converting CSV to JSON, the first row is treated as column headers by default. If your CSV has no headers, toggle that option off to get array-of-arrays output instead.

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class Root { final int id; final String name; final String email; final bool active; final double score; final Address address; final List<String> tags; final List<OrdersItem> orders; Root({ required this.id, required this.name, required this.email, required this.active, required this.score, required this.address, required this.tags, required this.orders, }); factory Root.fromJson(Map<String, dynamic> json) { return Root( id: json['id'], name: json['name'], email: json['email'], active: json['active'], score: json['score'], address: Address.fromJson(json['address']), tags: json['tags'], orders: (json['orders'] as List).map((e) => OrdersItem.fromJson(e)).toList(), ); } Map<String, dynamic> toJson() { return { 'id': id, 'name': name, 'email': email, 'active': active, 'score': score, 'address': address.toJson(), 'tags': tags, 'orders': orders.map((e) => e.toJson()).toList(), }; } } class OrdersItem { final int id; final double total; OrdersItem({ required this.id, required this.total, }); factory OrdersItem.fromJson(Map<String, dynamic> json) { return OrdersItem( id: json['id'], total: json['total'], ); } Map<String, dynamic> toJson() { return { 'id': id, 'total': total, }; } } class Address { final String street; final String city; final String zip; Address({ required this.street, required this.city, required this.zip, }); factory Address.fromJson(Map<String, dynamic> json) { return Address( street: json['street'], city: json['city'], zip: json['zip'], ); } Map<String, dynamic> toJson() { return { 'street': street, 'city': city, 'zip': zip, }; } }

Frequently Asked Questions

Does it handle nested JSON objects?

Yes. Nested objects are automatically converted to separate Dart classes with proper references and fromJson/toJson methods.

Are arrays supported?

Yes. Arrays are converted to List<Type> in Dart. Nested object arrays generate their own class definitions.

Can I customize the root class name?

Yes. Use the root class name input to set your preferred name. All generated classes use PascalCase naming.

About JSON to Dart

What this tool does

Why use this tool

How it works

Pro tip

When converting CSV to JSON, the first row is treated as column headers by default. If your CSV has no headers, toggle that option off to get array-of-arrays output instead.

JSON to Dart

How It Works

Paste JSON

View Classes

Copy Code

Frequently Asked Questions

About JSON to Dart

What this tool does

Why use this tool

How it works

Pro tip

Deep Dive: Related Research

Explore More

Related Tools

Guides

Love this tool? Explore 12467+ more

JSON to Dart

How It Works

Paste JSON

View Classes

Copy Code

Frequently Asked Questions

About JSON to Dart

What this tool does

Why use this tool

How it works

Pro tip

Deep Dive: Related Research

Explore More

Related Tools

Guides

Love this tool? Explore 12467+ more