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Drag & drop a .json file anywhere on this page
Paste raw JSON or drop a file — get a clean, indented result in one click. Format and minify JSON free, directly in your browser. Works offline — your data is never sent to any server.
Paste or upload your JSON
Paste raw JSON into the input editor, or drag and drop a .json file anywhere on the page — files up to 5 MB are supported.
Set the indent size for formatted output
Use the − / + stepper to choose an indent from 1 to 8 spaces to match your project's code style.
Click Format or Minify
Format pretty-prints the JSON with indentation. Minify strips all whitespace for the most compact output — useful for reducing API payload size.
Check the error message if parsing fails
Invalid JSON shows the exact line and column of the problem, so you can jump straight to a trailing comma, missing quote, or unescaped character instead of scanning the whole input.
Copy or download the formatted result
Click Copy to send the formatted output to your clipboard, or click the download icon to save it as a .json file.
All JSON processing happens locally in your browser, so your data is never sent to a server. Formatting uses native JavaScript — no network request is made, and the page keeps working fully offline once it has loaded.
Format adds newlines and indentation to make JSON human-readable. Minify removes all whitespace to produce the most compact output — useful for reducing API payload size and storage footprint. You can set the indent from 1 to 8 spaces before formatting, and switch to Minify any time without re-uploading your JSON.
The formatter flags the exact line and column of the first syntax error it finds. Start there rather than scanning the whole file for the mistake. The most common causes are a trailing comma after the last item, a missing closing bracket or quote, and an unescaped special character inside a string.
This JSON formatter accepts uploaded or pasted files up to 5 MB in size. Files over 1 MB trigger a performance warning, since JSON.parse on large payloads can take several hundred milliseconds on slower devices.
Yes — output over 10 MB won't render, since it's too large for the browser to display. If you hit that ceiling, try Minify first to shrink the result, or work with a smaller slice of the file instead.
No — this formatter follows strict JSON only, so JSON5 and JSONC with comments are not supported. It uses the native browser JSON.parse method, which strictly follows the RFC 8259 / ECMA-404 specification — comments and trailing commas both cause a parse error rather than being silently accepted.
Yes — clicking Load example fills the input with a sample JSON snippet. You can then format or minify it right away, which is a quick way to see how the tool behaves before pasting in your own data.