About this Online JSON Viewer and Formatter
This free JSON tool helps you format (pretty‑print), minify, validate, and explore JSON data right in your browser.
It also converts JSON to Go structs, CSV, and JSON Schema. Everything runs client‑side, so your data never leaves
your device — fast, private, and secure.
Key features
- JSON formatting, minification, and validation with line/column error reporting
- Collapsible tree view for interactive JSON exploration
- Generate Go struct types from your JSON
- Convert JSON to CSV with smart header merging and dot‑notation flattening
- Create JSON Schema (Draft 2020‑12) from sample JSON
- Drag‑and‑drop .json files, sample loader, and copy output
- Works fully offline in your browser for maximum privacy
How to use
- Paste or drop your JSON into the Input area
- Click Format to pretty‑print or Minify to compress
- Use To Go, To CSV, or To Schema to generate code or data
- Copy output with the Copy button in the Output panel header
- Keyboard shortcut: Ctrl/Cmd + Enter to Format
JSON Viewer & Formatter: Frequently Asked Questions
Is this JSON viewer private?
Yes. All processing happens in your browser. No JSON is uploaded or stored on a server.
How do I format or minify JSON?
Paste your JSON into Input, then click Format to pretty‑print or Minify to remove whitespace.
Can I convert JSON to a Go struct?
Yes. Click To Go and the tool will infer field names and types, generating an idiomatic Go struct.
How does JSON to CSV work?
Objects are flattened using dot notation and headers are unified across rows so you get a clean, consistent CSV.
What JSON Schema draft is used?
The generated schemas are compatible with JSON Schema Draft 2020‑12.
Does it support large JSON files?
The app is optimized for speed and can handle reasonably large JSON files, limited by your browser memory.