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⚡ Advanced Developer Toolbox Transform, Mock, Security & API Client
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Class / Model to JSON: Keys:
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Paste JSON Payload

Paste raw JSON, drag & drop a .json file, or choose a workflow below:

○ Waiting for JSON | Lines: 0 · Chars: 0 · Size: 0 B · Depth: 0
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Invalid JSON

Generated Output

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Ready to generate
Paste JSON in the input panel and hit Beautify or Generate to see results here.

JSON Workbench — The All-in-One JSON Developer Toolkit

JSON Workbench is a free, local-first developer tool that runs entirely in your browser. Paste a raw API response and instantly format and beautify it, diff two payloads side-by-side, validate against a JSON Schema, or generate typed code for your language of choice — all without sending a single byte to a server.

The JSON → Code generator supports 12+ targets: Java (POJO & Lombok), TypeScript interfaces, Python dataclasses, Go structs with json tags, C# classes, Kotlin data classes, Swift Codable structs, Rust Serde structs, Dart Flutter models, OpenAPI 3.0 YAML, GraphQL type definitions, and Protobuf proto3 schemas. Copy the generated code directly into your IDE — no signup, no rate limits, no ads interrupting your flow.

Additional tools include a visual JSON Diff checker (highlights added, removed, and changed fields), a synthetic mock data generator (produces realistic UUIDs, emails, dates, and names in bulk), a SQL/DDL exporter, a Postman Collection builder, a JSONPath evaluator, a JWT decoder, a PII sanitizer, and a live Mock API server with request inspection. Everything is offline-capable via a Service Worker — it works even without an internet connection.