Core Tools
Code Generation
Format Conversion
Auxiliary Tools
Why GreenJSON
GreenJSON is a purely front-end JSON toolkit. All operations run locally in your browser — no data is ever sent to a server. It supports JSON formatting, validation, compression, beautification, tree view, diffing, and conversion between JSON and XML/YAML/CSV/TypeScript/Java/Go formats.
Key Features
Privacy First
All data processing happens locally in your browser. Nothing is uploaded to any server — your data never leaves your device.
Blazing Fast
Pure front-end implementation with no network latency. Process large JSON files instantly with a smooth, responsive experience.
Completely Free
All tools are free forever. No registration required, no usage limits — just open and start working.
Multi-language
Supports five interface languages: English, Simplified Chinese, Traditional Chinese, Japanese, and Korean. Auto-detects browser language.
FAQ
Does GreenJSON store my data?
No. All JSON data is processed only in browser memory. It is never uploaded to a server or stored locally. Refreshing or closing the page clears all data immediately.
How large a JSON file can I process?
Theoretically limited only by browser memory. In testing, JSON files up to 10MB process smoothly. Larger files may be slower depending on your browser and hardware.
Is the JSON-to-TypeScript conversion accurate?
It uses recursive type inference and correctly handles nested objects, arrays, and union types. For complex structures, we recommend manually reviewing the generated interface definitions.