JSON Formatter — Format, Validate and Beautify JSON Online

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 error message from your browser's JSON parser, which usually includes the position. 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 happens locally in your browser. Errors surface the 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. Formatting runs in your browser rather than through the Pixoate processing API. Follow your organization's security rules before opening production secrets or personal data in any web application.

Yes. Use the Upload JSON file strip to read a .json file directly into the editor. Files up to 5 MB are accepted, so split larger API dumps or log files before formatting them.

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.

You can use, copy and download the result without creating an account. The output has no Pixoate watermark.

It validates that your JSON is syntactically correct against the RFC 8259 standard — it parses the document and reports the parser's error message, usually with the position — 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.

Yes. Paste raw JSON or drop a .json file and hit Prettify — the output pane renders it with your chosen 2, 4 or 8-space indentation so nested objects and arrays are easy to scan. Because everything runs in your browser and your data never leaves your device, it works as a quick JSON viewer for API responses and config files.

No — JSON Prettify runs entirely in your browser, so what you paste never leaves the machine you are on. That matters if you are checking something that contains a token, a key or customer data. Closing the tab is enough to clear it.

The error points at the first position that could not be parsed, which is usually just after the real mistake rather than on it — a missing comma, an unclosed quote or bracket, or a smart quote pasted in from a document instead of a straight one. Check the line above the reported position first.

JSON Prettify supports free standard use within the published processing allowances. Free downloads are clean — no watermark. No signup is required for standard tool use. Photo effects and AI edits have a web-size limit on Free, with the original-resolution result available through Premium or one credit. Crop, resize, rotate, compress and convert stay full size. Published processing allowances and file limits still apply.

No — JSON Prettify runs in the browser on desktop and phone. There is nothing to install, no trial to start, and no license to buy before you can see whether it does what you need. Try it on the file you are actually stuck with rather than a sample.

JSON numbers are read as standard JavaScript numbers, which keep about 15 to 17 significant digits. An integer such as 12345678901234567890 comes out as 12345678901234567000, and 1.50 becomes 1.5. If a value is an ID that must stay exact, store it as a string in the source data.

Keys that look like whole numbers, such as "2" or "10", are moved to the front in ascending order by the JavaScript engine, ahead of the other keys, which keep their original order. The tool has no option to sort keys, so a document with only text keys comes out in the order you wrote it.

When the same key appears twice in one object, the parser keeps the last value and discards the earlier ones, with no warning. If both values matter, rename one key in the source or move them into an array before you format the document.

Uploads over 5 MB are refused with a size message and your current text is kept. You can still paste the text, although very large pastes depend on your browser and device memory. For files this big, a desktop editor or a command-line formatter is often smoother.

The message is produced by the JSON parser built into your browser, and each browser words it differently. Some report a position, some a line and column, and some quote a token. They all point at the same first problem, so use whichever detail yours gives.