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Validate, beautify, and minify JSON with a collapsible tree view and precise error locations — all processed locally in your browser.
Crop images visually with aspect-ratio presets and drag handles — export as PNG, JPG, or WebP, all offline.
Paste or drop
Paste your JSON or drop up to 15 .json files. Choose Beautify or Minify and set your indent.
Format & validate
Click Format. Invalid JSON is reported with the exact line and column; valid JSON is pretty-printed and shown as an interactive tree.
Copy or download
Explore the collapsible tree, then copy or download the formatted .json. Nothing leaves your device.
Yes. If your JSON is invalid, the tool pinpoints the error with a line and column number and a plain-language explanation so you can fix it fast.
The collapsible tree lets you explore nested objects and arrays visually — expand and collapse branches to navigate large payloads without scrolling through raw text.
Yes. Switch to Minify to strip all whitespace and produce the most compact valid JSON, ideal for API requests and storage.
No. Parsing, formatting, and validation all run in your browser, so even sensitive API responses and config files remain private.
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Well-formatted JSON is essential for reading API responses, editing config files, and debugging data. This tool parses your JSON, validates it with precise error locations, and pretty-prints it with your chosen indentation. A collapsible tree view makes deeply nested structures easy to explore, while minify mode produces compact output for transport. Because it all runs client-side, even confidential payloads stay on your machine.
- Instant validation — invalid JSON is caught with exact line and column numbers.
- Beautify or minify — switch between readable indentation and compact output.
- Interactive tree — expand and collapse nested objects and arrays visually.
- Flexible indent — choose 2 spaces, 4 spaces, or tabs.
- Batch friendly — format up to 15 JSON files at once with per-file download.
The JSON formatter is fully client-side. Your data is parsed and formatted in-browser using the native JSON engine, with no uploads, no storage, and no external calls — safe for API keys, tokens, and private datasets.