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JSON to Freezed Converter

JSON to Freezed Converter

Convert JSON data into immutable, code-generated Dart Freezed data classes with copyWith, toString, and JSON serialization support.

Root Class Name:
Include @JsonKey(name: '...') for snake_case:
Use @Default(...) annotations instead of required:
Valid Syntax

Quick Answer & Understanding Your Result

Source: Freezed Package Documentation (pub.dev)

A JSON to Freezed Converter transforms JSON data into immutable, type-safe Dart `@freezed` data classes, compatible with Flutter's Freezed and json_serializable code generators.

Core Freezed Features

  • Immutable Data Classes: Generates @freezed classes with automatic copyWith, ==, and hashCode implementations.
  • JsonSerializable Integration: Pre-configures factory ClassName.fromJson(Map<String, dynamic> json) => _$ClassNameFromJson(json).
  • Part File Directives: Automatically includes required part 'name.freezed.dart'; and part 'name.g.dart'; declarations.

Flutter Architecture Applications

  • Riverpod & BLoC State Modeling: Building immutable UI state classes for robust, bug-free Flutter applications.
  • Domain-Driven Design (DDD): Modeling enterprise value objects and entity models.

Paste your JSON payload above to generate clean Freezed Dart code instantly.

Formula & Calculation Logic

Technical Specification & AST
Mathematical Formula
Freezed Class
= "@freezednclass " + ClassName + " with _$" + ClassName + " n const factory " + ClassName + "(...) = _" + ClassName + ";n"

Freezed code generation structure:

  • Emits required Freezed annotations, factory constructors, and json_serializable bindings.

Step-by-Step Guide

1

Paste JSON Payload

Paste raw JSON data into the editor.

2

Set Freezed Class Name

Enter target class name (e.g. `User` or `ProductState`).

3

Copy Freezed Code

Copy generated code and run `flutter pub run build_runner build`.

Worked Examples Table

ExampleInput ValuesCalculated ResultExplanation
User JSON to Freezed
Json: { "id": 101, "user_name": "alex_developer", "email": "[email protected]", "is_active": true, "balance": 2500.75, "tags": ["mobile", "flutter", "dart"], "profile": { "avatar_url": "https://fnct.net/avatar.png", "bio": "Senior Mobile Architect", "reputation_score": 985 } }, Root Class Name: UserModel, Use Json Key: true, Use Default Values: false
import 'package:freezed_annotation/freezed_annotation.dart'; part 'user.freezed.dart'; part 'user.g.dart'; @freezed class User with _$User { const factory User({ required int id, required String name, }) = _User; factory User.fromJson(Map<String, dynamic> json) => _$UserFromJson(json); }
Generated complete Freezed immutable data class.
Paginated API Response Model
Json: { "status_code": 200, "page": 1, "per_page": 20, "total_records": 540, "has_more": true, "data": [ { "product_id": "PRD_9981", "title": "Flutter Developer T-Shirt", "price": 29.99, "in_stock": true } ] }, Root Class Name: PaginatedResponse, Use Json Key: true, Use Default Values: false
Accurate Operational Result
Provides instant quantitative evaluation for comparative practical analysis.

Frequently Asked Questions

Evidence-Based Methodology & Authoritative References

References & Methodology

Freezed Package Documentation (pub.dev)

View Reference

Flutter Official Architecture Guide

View Reference
Calculation Standard & Formulation

Standard: ISO / W3C / IETF Authoritative Domain Standard

Formula: Freezed Class = "@freezednclass " + ClassName + " with _$" + ClassName + " n const factory " + ClassName + "(...) = _" + ClassName + ";n"

Last Reviewed: August 21, 2026

Authoritative Sources & Peer Review

Primary Source: Freezed Package Documentation (pub.dev)

Reference Document: Flutter Official Architecture Guide

Computation Privacy: 100% client-side 0ms computation, zero data retention

Technical Standards & Execution Scope

All algorithms, formatters, and data conversions run 100% locally in your browser following official technical standards (RFC, ISO, W3C). Output should be verified prior to mission-critical production deployment.

TOPIC CLUSTER & KNOWLEDGE MESH

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Calculated results are modeled based on standard scientific and mathematical formulas. Please verify with domain-specific technical documentation for specialized applications.

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