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.

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About JSON to Dart

Working with this task no longer requires installing heavy desktop software — JSON to Dart runs entirely in your browser, instantly. Built to be the kind of tool you bookmark and use weekly: no surprises between visits, no degraded free tier, and a UI that gets out of the way. It is one of about a hundred utility tools that share the same philosophy: do one thing, do it well, get out of your way.

When you'd reach for JSON to Dart

You need to handle a one-off task right before a meeting and don't have time to install anything.
Anyone working remotely on a borrowed or restricted machine.
Open the page, get the result, paste it into your doc — under a minute.
You're on a public or shared machine and don't want to leave traces of what you're working on.
Travelers, contractors, anyone working from a friend's computer.
Nothing is uploaded, nothing persists if you're not signed in.
You're cleaning up a folder of files that accumulated over a project and need to standardize them.
Designers, writers, and developers wrapping up deliverables.
Drop each file in, copy the output, move on.
You're hitting the daily limit of a paid SaaS and need a backup option for a single quick job.
Marketers and ops people whose primary tool is metered.
Stay productive without burning credits.

Frequently asked about JSON to Dart

Can I use JSON to Dart commercially?: Yes. The output of JSON to Dart belongs entirely to you, with no licensing restrictions.
Does JSON to Dart work on mobile?: Yes, JSON to Dart is fully responsive and tested on iOS Safari and Android Chrome.
Is JSON to Dart really free?: Yes — JSON to Dart is free for unlimited personal use, with no account required and no watermark on the output.
Will JSON to Dart change my original file?: Never. JSON to Dart only reads your input file and produces a new output file.
Are my files uploaded to a server when I use JSON to Dart?: JSON to Dart processes everything in your browser using local APIs. Your files never leave your device.

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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

When you'd reach for JSON to Dart

You need to handle a one-off task right before a meeting and don't have time to install anything.

Anyone working remotely on a borrowed or restricted machine.

Open the page, get the result, paste it into your doc — under a minute.

You're on a public or shared machine and don't want to leave traces of what you're working on.

Travelers, contractors, anyone working from a friend's computer.

Nothing is uploaded, nothing persists if you're not signed in.

You're cleaning up a folder of files that accumulated over a project and need to standardize them.

Designers, writers, and developers wrapping up deliverables.

Drop each file in, copy the output, move on.

You're hitting the daily limit of a paid SaaS and need a backup option for a single quick job.

Marketers and ops people whose primary tool is metered.

Stay productive without burning credits.

Frequently asked about JSON to Dart

Can I use JSON to Dart commercially?

Yes. The output of JSON to Dart belongs entirely to you, with no licensing restrictions.

Does JSON to Dart work on mobile?

Yes, JSON to Dart is fully responsive and tested on iOS Safari and Android Chrome.

Is JSON to Dart really free?

Yes — JSON to Dart is free for unlimited personal use, with no account required and no watermark on the output.

Will JSON to Dart change my original file?

Never. JSON to Dart only reads your input file and produces a new output file.

Are my files uploaded to a server when I use JSON to Dart?

JSON to Dart processes everything in your browser using local APIs. Your files never leave your device.

JSON to Dart

How It Works

Paste JSON

View Classes

Copy Code

Frequently Asked Questions

About JSON to Dart

When you'd reach for JSON to Dart

Frequently asked about JSON to Dart

Deep Dive: Related Research

Explore More

Related Tools

Often used together

Guides

vs other tools

JSON to Dart

How It Works

Paste JSON

View Classes

Copy Code

Frequently Asked Questions

About JSON to Dart

When you'd reach for JSON to Dart

Frequently asked about JSON to Dart

Deep Dive: Related Research

Explore More

Related Tools

Often used together

Guides

vs other tools