JSON Formatter & Validator

Beautify, validate & minify JSON — instant, in your browser.

Stays on your device. This tool runs in your browser — nothing you paste or open ever leaves it. Nothing uploaded, nothing to leak.

JSON input

✓ Valid JSON ✓ Repaired & formatted

Output

JSONPath query (e.g. items[0].name)

Run the tool first — there’s no result to send yet.

How to format JSON

Paste or type JSON into the box and press Format to pretty-print it with two-space indentation, or Minify to collapse it to one compact line. If the JSON is invalid, the error and its rough position are shown so you can correct it. Copy the result with one tap — it never leaves your browser.

JSON Formatter — TechWhack Score

9.8/10

Privacy 10/10

JSON is formatted in your browser — nothing is uploaded, and nothing is ever saved public.
Speed 10/10

Formats, minifies and validates instantly.
Features 9/10

Beautify or minify in one click, with syntax errors flagged so you can fix them fast.
Free 10/10

No sign-up, no daily limit, embeddable.

Verdict: Formats and validates JSON locally — so your data is never uploaded or, as on some tools, saved to a public URL.

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A JSON formatter beautifies, validates and minifies JSON entirely in your browser. Paste your JSON and click Format to indent it cleanly or Minify to strip whitespace — any syntax error is flagged so you can fix it fast. Nothing is uploaded.

What developers use it for

Tidying API responses to read them, minifying config before shipping, validating payloads while debugging, and diffing two structures by formatting both. Because it runs client-side it works offline and is safe for sensitive data that should not touch a server.

FAQ

What does it mean when JSON is "invalid"?Invalid JSON breaks the format rules, often from a trailing comma, a missing quote or bracket, or single instead of double quotes. The validator flags the syntax error and points you to the spot so you can fix it.

What is the difference between beautifying and minifying JSON?Beautifying adds indentation and line breaks so the structure is easy to read, while minifying strips all that whitespace to make the smallest possible string for transmission. Use beautify for debugging and minify for sending or storing data compactly.

Why must JSON use double quotes instead of single quotes?The JSON standard requires double quotes around keys and string values, so single quotes are a syntax error even though they look fine in some languages. Reformatting here highlights that so you can correct it.

Is my JSON sent to a server when I format it?No. Formatting, validating, and minifying all happen in your browser, so the data never leaves your device. That makes it safe to paste API responses or config that may contain sensitive values.