JSON Prettify & Minify - Format and Validate JSON Free

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.

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.

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.

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.

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.

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.

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.

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.

It validates that your JSON is syntactically correct against the RFC 8259 standard — it parses the document and pinpoints the exact line and column of any error — but it does not check against a JSON Schema (required fields, value types, ranges). For instant syntax checking and formatting it is ideal; for schema conformance you will need a dedicated JSON Schema validator.

Two spaces is the most common default — it matches Prettier and most style guides and stops deeply nested objects drifting too far right. Four spaces reads well for shallow config files, and eight is mainly for printing or presentation. All three produce identical, valid JSON, so pick whatever your team's linter expects, then Copy or Download the result.

Yes — alongside this JSON formatter we have an HTML Prettify tool that beautifies and minifies HTML, part of the same free in-browser developer toolkit. For JSON specifically, this page handles prettify, minify and syntax validation; switch to the matching formatter for other languages.

Tree mode renders your parsed JSON as an interactive, collapsible tree instead of a flat text block, so you can expand or collapse nested objects and arrays to explore a large API response without scrolling through indentation. Prettify still gives you copyable, downloadable formatted text; switch to Tree when you just need to inspect structure, then back to Prettify or Minify when you need the actual output file.

Use Tree mode first to explore a big nested payload — expand only the branches you care about instead of scrolling a wall of indented text. Once you've confirmed the shape is correct, switch to Minify to produce the compact single-line JSON you actually paste into a request body or config file; both modes read the same pasted input, so switching between them is instant.

Click Try sample to instantly load a small demo JSON object with a nested object, an array and a boolean so you can see Prettify, Minify and Tree mode working before pasting real data. Once you're done inspecting it, hit Clear next to the input panel to wipe the editor back to empty and start fresh with your own JSON.