JSON Formatter & Validator

Free browser-side developer tool

JSON Formatter & Validator

Format, validate, beautify, minify, sort, and inspect JSON online. Paste API responses, webhook payloads, n8n data, automation logs, config files, or app settings and check whether the JSON is valid instantly.

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Quick answer:

This JSON formatter checks whether your JSON is valid, then beautifies it with readable indentation or minifies it into one line. It also shows object count, array count, key count, string count, number count, file size, and common error messages.

Paste JSON to format or validate

No upload · No storage · Browser-side

Indent size

Output mode

Download filename

Search key/value optional

Sort object keys A-Z Escape output for string Auto validate while typing Smart cleanup before parse

JSON input

Formatted output

Your formatted JSON will appear here.

JSON status Waiting

Objects 0

Arrays 0

Keys 0

Strings 0

Numbers 0

Booleans/null 0

Output size 0 KB

This tool validates strict JSON. If your data uses comments, single quotes, trailing commas, or JavaScript object syntax, enable “Smart cleanup” to try simple cleanup first, then check the result manually.

What is a JSON formatter and validator?

A JSON formatter and validator checks whether JSON is valid and converts it into a readable format. Developers use it to debug API responses, webhook payloads, app settings, automation data, and structured configuration files.

This tool can beautify JSON with indentation, minify JSON into one line, sort object keys, and show useful statistics about the structure.

How to format JSON online

Paste your JSON into the input box.
Choose 2 spaces, 4 spaces, or tab indentation.
Click “Format & Validate”.
If the JSON is valid, copy or download the formatted output.
If an error appears, fix the line or syntax problem and validate again.

Common JSON errors

Using single quotes instead of double quotes.
Adding a trailing comma after the last item.
Forgetting a comma between two keys or array items.
Using comments inside JSON.
Missing a closing bracket, brace, or quote.
Using undefined values instead of null.

Best use cases

Formatting API responses before debugging.
Checking webhook payloads from Stripe, Twilio, WordPress, n8n, Make, or Zapier.
Beautifying JSON copied from browser developer tools.
Minifying JSON for configs or compact storage.
Sorting object keys for easier comparison.
Inspecting large automation payloads before building workflows.

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FAQ

What does a JSON formatter do?

A JSON formatter turns compact or messy JSON into readable, indented JSON so it is easier to inspect, debug, and share.

What does a JSON validator do?

A JSON validator checks whether your JSON syntax is valid. If there is a syntax error, it shows an error message so you can fix the data.

Is my JSON uploaded or stored?

No. This tool runs in your browser. Your JSON is not uploaded, saved on WordPress, or stored on Hostinger.

Can this tool minify JSON?

Yes. Click “Minify JSON” or select minify mode to convert valid JSON into a compact one-line version.

Can I sort JSON keys?

Yes. Enable “Sort object keys A-Z” before formatting. The tool will sort object keys recursively.

Does JSON allow comments or trailing commas?

Strict JSON does not allow comments or trailing commas. This tool validates strict JSON, but the smart cleanup option can try simple cleanup before parsing.

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