JSON Prettify & Minify - Format and Validate JSON Free

Paste, validate and prettify JSON with 2 / 4 / 8 space indentation, or minify to a single line. Drop a .json file or paste, then copy or download.

Input JSON

or drop a .json file

Formatted Output

About JSON Prettify
Runs entirely in your browser — your data never leaves your device. Parses with the native JSON engine, so an invalid token surfaces the exact line / column from the parser. Use Minify to strip every whitespace character before shipping to an API or wire format.
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Frequently Asked Questions
Paste your JSON into the input panel — it is parsed and reformatted instantly with 2, 4 or 8-space indentation. If the JSON is invalid, you get the exact line and column of the error from the native parser. Everything runs in your browser, so no API keys, no rate limits, and your data never leaves your device. Use Prettify for readable, indented output or Minify to collapse to a single line for shipping over the wire.
usage
Prettify adds line breaks and indentation so JSON is easy for humans to read and review during debugging. Minify strips every space, tab and newline, producing the smallest possible payload — useful for API requests, configuration embedded in source code, and reducing bundle size. Our tool offers both modes with a single click.
features
Validation is powered by your browser's native JSON.parse, the same parser used by every JavaScript runtime. Errors surface the exact offending token plus its position, which usually pinpoints a missing comma, unmatched bracket, trailing comma, or unquoted key. Fix the highlighted spot and the output panel updates as you type.
technical
No. The JSON Prettify tool runs 100% client-side in your browser — no server round trip, no logging, no caching. This makes it safe for sensitive payloads like API responses with personal data, internal configuration, or production secrets that you would never paste into a hosted tool.
privacy
Yes. Drag any .json file onto the input panel and it is read directly into the editor. Large files (multi-megabyte API dumps, exported configs, log files) work as long as your browser can hold them in memory — typically tens of megabytes without issue.
usage
No, the tool follows strict RFC 8259 JSON because that is what JSON.parse accepts. Comments, trailing commas, single quotes and unquoted keys will be flagged as invalid. If you need JSON5 or JSONC support, strip the non-standard syntax first, then format with Pixoate.
features
After formatting, click Copy to put the result on your clipboard with a single keystroke, or click Download to save as output.json (or output.min.json in minify mode). The output preserves UTF-8 encoding, so emoji and non-Latin characters stay intact.
tips
Completely free with no account required. There are no usage limits, no watermarks, no ads in the output, and no paid tier. The tool exists alongside our PDF and image utilities as part of a free developer-and-creator toolkit.
pricing
Use Cases
API Response Debugging
Paste a minified API response from your dev tools and instantly see the structure indented. Spot missing fields, validate the shape, and confirm null vs. undefined handling without firing up a JSON viewer extension.
development
Config File Cleanup
Pull a tangled package.json, tsconfig.json or .eslintrc.json back into a readable shape after a merge conflict resolution. Format, sanity-check, and commit a clean version in one minute.
development
Database Export Inspection
Inspect a JSON export from MongoDB, DynamoDB or Firestore before importing it. Validate that the structure matches your schema and that no records have unexpected null collisions.
data
Webhook Payload Inspection
Capture an incoming webhook payload from Stripe, GitHub, Linear or Slack and pretty-print it to understand the shape — essential when building integrations or debugging missing event fields.
development
Code Review Helpers
Paste reviewer-supplied JSON examples into PR descriptions in their full prettified form, or shrink them with Minify when space is tight in chat. Either way the file is valid and copy-paste safe.
development
Production Secret Handling
Because everything runs in your browser, you can paste production secret payloads to inspect them without any network round trip — exactly the workflow that DevOps teams need but cloud JSON tools can't provide safely.
privacy