JSON Formatter
Client-sidePopularFeaturedFormat, beautify, and minify JSON in your browser. Free, private, and instant — no upload to a server.
Processed in your browser — data stays on your device
About JSON Formatter
JSON Formatter helps you beautify messy API payloads, config files, and logs into readable, indented JSON — or compress them into a single minified line.
Everything runs locally in your browser. Your data is never uploaded, making it safe for tokens, customer records, and internal payloads.
Features
Pretty print
Indent nested objects and arrays with consistent spacing for readability.
Minify
Collapse JSON into a compact single-line string for transport or storage.
Auto format
Valid JSON is pretty-printed automatically as you type or paste.
Error highlighting
Invalid JSON shows line and column so you can fix issues quickly.
Copy & download
Copy formatted output to the clipboard or download a .json file.
Upload support
Drop a JSON file or browse from disk — processed only on your device.
How it works
Paste or upload JSON
Drop a .json file or paste raw JSON into the input panel.
Auto-format or run actions
Valid JSON pretty-prints automatically. Use Minify, Copy, or Download as needed.
Fix errors inline
Invalid JSON shows the line and column so you can correct it quickly.
Example walkthroughs
Nested object
A compact user object becomes readable with indented properties and array items.
{"user":{"id":1,"name":"Ada","roles":["admin","editor"]},"active":true}Array of records
Inventory-style arrays format cleanly so each record is easy to scan.
[{"sku":"A-100","qty":3},{"sku":"B-200","qty":1},{"sku":"C-300","qty":8}]
Use cases
Debug API responses
Paste responses from curl, Postman, or browser Network tabs to inspect nested fields.
Clean config before commit
Normalize package manifests, theme tokens, or feature flags before sharing.
Prepare payloads for docs
Pretty-print samples for README files, tickets, and design reviews.
Frequently asked questions
Is my JSON uploaded to a server?
No. The JSON Formatter runs entirely in your browser. Your data never leaves your device.
Can I minify JSON as well as beautify it?
Yes. Use Pretty print for readable formatting and Minify to compress JSON to a single line.
What keyboard shortcuts are available?
Cmd/Ctrl+Enter formats, Cmd/Ctrl+Shift+M minifies, Cmd/Ctrl+Shift+C copies output, and Cmd/Ctrl+Shift+R resets.
Does it work on mobile?
Yes. The workspace stacks input and output on small screens and keeps actions reachable.
Related tools
JSON Validator
Validate JSON instantly in your browser. See type, size, and node counts — or exact parse errors with line and column.
JSON Viewer
Explore JSON as an interactive tree with paths, types, and expandable nodes — all processed locally in your browser.
JSON Compare
Compare two JSON documents structurally. Find added, removed, changed, and type-changed paths — privately in your browser.
JSON Diff
Generate a unified diff of two JSON documents after pretty-printing. Ideal for reading line-level changes quickly.
JSON Escape
Escape text into a JSON string literal, or unescape a JSON string back to raw text — instantly and offline.