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Format, Validate & Minify JSON Online

Paste JSON to pretty-print it, validate it or minify it. If there is an error, the line is shown and highlighted. Your data never leaves your device.

🔗 Direct link sahlify.uk/en/json-formatter/

How does it work?

Type or paste your data.
The result appears instantly.
Copy or download the result.

Why use JSON Formatter?

✓ 100% free, no limits, no watermark
✓ No sign-up, no install
🔒 Files processed locally: full privacy
📱 Works on desktop, tablet and mobile

Frequently asked questions

Is my JSON uploaded?

No, all processing happens in your browser.

What does minify mean?

Removing spaces and line breaks to get the smallest possible file.

Is my data uploaded?

No, formatting and validation happen in your browser.

How large can the JSON be?

Several megabytes without difficulty on a recent computer.

Is this tool really free?

Yes, 100% free, with no sign-up, no watermark and no usage limit.

Are my files safe?

Yes. Processing happens directly in your browser: your files are never uploaded to a server or stored.

When to use it

The JSON formatter makes an API response, config file or data export readable, pinpoints the syntax error that breaks a script and minifies JSON before going to production.

Our tips

💡 Most common errors: trailing comma, single quotes, unquoted keys.
💡 Use 2-space indentation for files versioned in Git.
💡 Never paste API tokens or passwords into tools that upload data (here, everything stays local).