Parser & Formatter
Format, validate, and beautify JSON in real-time with inline error highlighting and tree view.
Visual JSON Diff
Side-by-side line diff with word-level change highlighting. See exactly what changed.
Schema & TypeScript
Auto-generate JSON Schema (Draft-07) or TypeScript interfaces from any JSON input instantly.
Flatten / Unflatten
Convert nested JSON to dot-notation flat keys and back. Perfect for config files and env vars.
Privacy First
All processing runs in your browser. Your JSON never leaves your device — no servers involved.
Shareable Links
Generate a unique URL to share your formatted or diffed JSON with teammates instantly.
All 23 Tools
JSON Parser & Formatter
Format, validate, explore
JSON Diff
Visual side-by-side diff
Schema Generator
Auto JSON Schema (Draft-07)
TypeScript Types
Generate interfaces from JSON
JWT Decoder
Decode & inspect tokens
JSONPath Query
Query JSON with path expressions
CSV ↔ JSON
Convert CSV and JSON
JSON ↔ YAML
Convert JSON and YAML
JSON ↔ XML
Convert JSON and XML
JSON Flatten
Flatten / unflatten nested JSON
JSON Escape
Escape special characters
Base64 Encoder
Encode / decode Base64
Timestamp Converter
Unix timestamps ↔ human dates
JSON Repair
Auto-fix broken JSON instantly
Schema Validator
Validate JSON against a JSON Schema
Regex Tester
Test regex with highlighted matches
Color Converter
HEX, RGB, and HSL conversions
Cron Parser
Explain cron syntax, see next runs
URL Parser
Split a URL, view query params as JSON
UUID Generator
Generate random UUID v4 values in bulk
Hash Generator
MD5, SHA-1, and SHA-2 family hashes
URL Encoder / Decoder
Percent-encode or decode a string
User-Agent Parser
Decode browser, OS, and device info
How We Compare
| Feature | JSON Parser Pro | JSONLint | JSON Editor Online | ExtendsClass |
|---|---|---|---|---|
| 100% browser-side (your JSON never leaves your device) | ||||
| Handles 20 MB+ files without freezing | ||||
| 23+ tools in one workspace | ||||
| Works offline after first load | ||||
| Shareable link — no account required | ||||
| Free forever · no signup · no ads | ||||
| Keyboard-driven (⌘K palette, ⌘F/M/T) | ||||
| Table view for JSON arrays |
Comparison based on publicly available features as of 2026. Competitor details may change — verify on their sites.
Frequently Asked Questions
Is my JSON data safe? Where does it go?
Nowhere. All parsing, formatting, validation, and conversion happens entirely in your browser using JavaScript. Your JSON is never uploaded, logged, or transmitted to any server — we have no backend for tool data. You can verify this yourself by opening your browser's Network tab (F12) while using any tool.
Do you store any of the JSON I paste?
The only place your JSON is stored is your own browser's IndexedDB (for the auto-save feature that survives refreshes). It is not sent to us, not synced to any cloud, and not shared with any third party. Clear your browser data to remove it.
Do you track me or run ads?
We use privacy-respecting anonymous analytics (page views and tool clicks — no personal data, no third-party cookies, no fingerprinting) to know which tools people rely on. There are no ads, no data sold, no tracking pixels. If you use an ad blocker, everything still works.
Are shareable links private?
For small JSON, the Share button encodes your data directly into the URL (base64 in the hash). The link is self-contained — the data never touches our server. That said, treat the link itself as sensitive: anyone with the URL can see the JSON, so don't paste it into public channels if the content is private.
Can I use this at work behind a firewall?
Yes. Because the tools run in your browser, no outbound requests are made with your JSON, so corporate firewalls and DLP tools have nothing to inspect. Once the page has loaded, everything works offline too.
How do I format or beautify JSON?
Paste your JSON into the left panel on the home page and it's formatted instantly in the right panel. Use the Formatted / Minified / Tree / Table tabs to switch views. Keyboard: ⌘F formats, ⌘M minifies, ⌘T is Tree view.
Keyboard Shortcuts
Enjoying JSON Parser Pro?
This tool is free and always will be — no signup, no paywall, no ads forcing your hand. If it's saved you time, a small donation helps keep it free and maintained.
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Built by Anjali & Sunil · Next.js, shadcn/ui, Tailwind CSS · freejsonparser.com