Yes. Everything runs 100% in your browser. No data is ever sent to a server. You can verify this by disconnecting from the internet — the tool works offline.

Standard JSON (RFC 8259), including nested objects, arrays, strings, numbers, booleans, and null. The formatter supports indentation with 2 spaces, 4 spaces, tabs, or minification.

TypeScript interfaces, Zod schemas, Go structs, Python dataclasses, and JSON Schema. The generator infers types from your data structure automatically.

It performs a semantic comparison of two JSON values, highlighting added, removed, and changed keys with their values. It compares structure and data, not just text.

No hard limit. Since processing happens locally, it depends on your browser and device memory. Files over 100 MB work fine on modern hardware.

Yes. After the first page load, all functionality works without an internet connection. No external API calls are made.