Free JSON Formatter & Validator
Paste JSON and see straight away whether it is valid, with the line and column when it is not. Pretty print it with your choice of indent, minify it for sending, and sort keys for clean diffs. It runs entirely in your browser, so nothing is uploaded.
Handy for a quick tidy-up or a sanity check. The output is standard JSON, ready for any parser or API.
Clean JSON in four steps.
Paste or upload your JSON, read the verdict, shape the output, then copy or download the result. Everything updates as you type.
Paste or upload
Paste your JSON into the box, or upload a .json or .txt file. The tool starts checking it straight away, and nothing is sent anywhere.
Read the verdict
Valid input gets a green Valid JSON badge. Invalid input shows the parser error, with the line and column when they can be worked out, so you know exactly where to look.
Shape the output
Choose Format to pretty print with 2 spaces, 4 spaces or tabs, or Minify to strip every extra space. Turn on sort keys to order every object A to Z.
Copy or download
Copy the result in one tap, or download it as a .json file, ready for your editor, your API client or your repo.
A formatter that tells you what is wrong.
Most JSON tools just say invalid. This one points at the line and column when it can, and gives you the layout options you actually reach for.
Validation as you type
Every change runs through a real JSON parser. Errors show the browser message plus the line and column when they can be derived, so you can jump straight to the broken spot.
Format and minify
Pretty print with your choice of 2 spaces, 4 spaces or tabs when a person needs to read it, or minify to the smallest possible size when a machine does. Flip between the two without losing anything.
Sort keys for clean diffs
One switch orders the keys of every object alphabetically, nested objects included, while arrays keep their order. Two files formatted this way diff cleanly in a code review.
Private by design
It runs entirely in your browser. Nothing you paste or upload is sent to a server, so API responses, config files and customer data stay on your own machine.
APIs that check themselves.
A formatter is great at the desk. But if your team passes JSON between systems every day, validating payloads, transforming shapes and keeping APIs in sync, that work belongs inside your own software. That is the kind of integration and API tooling we build at Techliphant, shaped around how your business actually runs.
Working with spreadsheet exports too? Try the CSV to JSON converter.
Common questions.
Paste your JSON into the box or upload a .json or .txt file. The tool checks it straight away, and Format pretty prints it with the indent you pick, 2 spaces, 4 spaces or a tab. You can then copy the result or download it as a .json file.
Just paste it in. The tool runs your text through a real JSON parser as you type. If it parses, you see a green Valid JSON badge. If it does not, you get the exact parser error, with the line and column when the browser reports enough detail to work them out.
It is the message from your browser's own JSON parser. An unexpected token usually means a stray character, a missing comma or an unquoted value. Unexpected end of input means something was left open, like a bracket or a quote. The line and column point you at the place to fix.
Beautify, also called pretty print, adds line breaks and indentation so a person can read the JSON. Minify strips every space and line break that is not inside a string, so the file is as small as possible for storing or sending over the network. Both hold exactly the same data, just laid out differently.
Yes. Turn on sort keys and every object in the document has its keys ordered A to Z, nested objects included. Arrays keep their order, since the order of an array is part of the data. Sorted keys make diffs and code reviews much easier when two versions of a file drift apart.
No. The whole tool runs in your browser using JavaScript. Nothing you paste or upload leaves your device, so it is safe to use with API responses, config files and other private data.
There is no fixed limit, but everything happens in your browser's memory, so very large files depend on your device. A few megabytes is instant on a normal laptop. For huge files or a repeatable pipeline, a small script is usually the better tool.
JSON is stricter than a JavaScript object literal. Keys must be wrapped in double quotes, strings must use double quotes rather than single, and there are no comments, no trailing commas and no undefined. If you pasted code copied from a JS file, fix those and it will validate.
Yes. A formatter is handy at the desk, but if your team passes JSON between systems every day, validating payloads, transforming shapes and syncing APIs, that work belongs inside your own software. That is the kind of integration and API tooling we build at Techliphant.
Private by design: this formatter runs entirely in your browser, so nothing you paste or upload is sent anywhere or stored. Your data stays on your own device. It is provided free for quick checks and everyday use.
Ready when you are
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