🔄 JSON to Code Generator — Java, C# & Spring Boot
Convert JSON into Java POJO, C# Class, C# Record, or Spring Boot JPA Entity classes instantly. 100% client-side — your data never leaves your browser.
Paste JSON and generate Java POJOs with Lombok + Jackson annotations, C# classes or records with System.Text.Json, or Spring Boot JPA entities with Hibernate annotations. Nested objects become inner classes automatically. Choose your target language from a dropdown and toggle annotation checkboxes. All code generation happens client-side — your JSON never leaves your browser.
📋 When to Use the JSON to Code Generator
The JSON to Code Generator is built for developers working across the full stack — Java backend engineers, .NET developers, and Spring Boot architects. Use it to rapidly generate POJOs, DTOs, C# model classes, immutable records, or Hibernate/JPA entities from any JSON payload. Whether you're integrating a third-party REST API, scaffolding a microservice, or migrating data models between stacks, this tool eliminates hours of boilerplate typing. All processing runs client-side — your code and API payloads stay private, never transmitted to any server.
⚙️ How the JSON to Code Generator Works
The tool parses your JSON in the browser using JavaScript, then applies language-specific code templates to generate idiomatic classes. It recursively handles nested objects as inner/child types, detects arrays and maps them to List types, and infers primitive types (String, int, boolean, double) from JSON values. Each target language gets its own code path: Java uses Lombok annotations (@Data) and Jackson (@JsonProperty), C# generates auto-properties with System.Text.Json support (record types for immutability), and Spring Boot mode produces full JPA entities with @Entity, @Table, @Id, @GeneratedValue, and @Column annotations. Your data never leaves your device — 100% client-side, privacy-first.
How to Use the JSON to Code Generator
- Paste your JSON — Drop any valid JSON object into the left panel. Nested objects and arrays are fully supported.
- Choose your target — Select Java POJO, C# Class, C# Record, or Spring Boot JPA Entity from the dropdown.
- Configure options — Enable annotations like Lombok, Jackson, System.Text.Json, or JPA/Hibernate based on your project's needs.
- Generate and copy — Click Generate to produce clean, idiomatic code. Copy it directly into your IDE or project.
Frequently Asked Questions
What languages does this support?
Java POJO/DTO (with Lombok + Jackson), C# Class (System.Text.Json with nullable types), C# Record (immutable, positional syntax), and Spring Boot JPA Entity (Hibernate with @Entity, @Table, @Id, @GeneratedValue).
Can it handle nested JSON objects?
Yes! Nested objects are automatically converted to inner/nested classes, preserving the full object hierarchy in every target language.
What's the difference between C# Class and C# Record?
C# Class generates traditional mutable classes with { get; set; } properties — ideal for DTOs and API models. C# Record generates immutable types with positional construction (Person p = new(Name, Age)), perfect for value objects and data transfer.
Does the Spring Boot mode generate working entities?
Yes. It produces @Entity classes with @Table, @Id, @GeneratedValue(strategy=IDENTITY), and optional @Column(snake_case) annotations. Works out of the box with Spring Data JPA — just add the generated file to your project.
What .NET version is the C# code compatible with?
C# 9+ for record types (requires .NET 5+). Class mode works with C# 8+ and .NET Core 3.0+. Nullable reference types require C# 8+.
Is my JSON data safe?
Absolutely. Everything runs in your browser using JavaScript — your JSON and generated code never leave your device. No server-side processing, no API calls, no data logging.
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