JSON Formatter
Format, validate, minify & explore JSON. 100% private, in-browser.
Format, validate, minify & explore JSON. 100% private, in-browser.
Many online JSON formatters POST your data to their server to process it — a real problem when that JSON contains API keys, tokens, or customer records. This tool parses and formats entirely in your browser, so sensitive payloads never leave your machine. It also gives you precise error locations, a collapsible tree view, key sorting and minification.
Safe for production payloads — nothing is uploaded, logged, or stored.
Invalid JSON? Get the exact line and column of the problem, not a vague message.
Collapse and expand nested objects and arrays to understand structure fast.
Alphabetize keys for clean diffs, or minify to the smallest possible size.
No. All parsing and formatting happens locally in your browser using the native JSON engine.
Very large ones — it's limited only by your browser's memory, not an upload cap.
We translate the parser's character position into a line/column so you can jump straight to the issue.