How do I format JSON online?

Paste your JSON into the MultiTool JSON Formatter, click Format/Prettify. It validates and pretty-prints your JSON instantly.

Is my JSON data safe?

Yes. All processing happens in your browser. Your JSON is never uploaded to any server.

Yes. Use the minify option to remove whitespace and compress JSON to a smaller size.

How to Format, Validate & Minify JSON Online Free

Q: Is JSON formatting free?

Yes, 100% free with no sign-up required.

Working with JSON APIs or config files? MultiTool JSON Formatter lets you prettify, validate, and minify JSON instantly in your browser — free, no sign-up, and your data stays private.

How to format JSON online (step by step)

Open the tool — Go to JSON Formatter & Validator.
Paste your JSON — Copy and paste raw JSON into the input box.
Format or validate — Click "Format" to prettify, or it will show errors if invalid.
Copy or download — Copy the formatted JSON or download it as a file.
Minify if needed — Use "Minify" to compress JSON for production use.

Why format JSON?

Readability — Pretty JSON is much easier to debug and understand.
Validation — Catch syntax errors quickly before using in code.
Smaller size — Minified JSON reduces payload size for APIs.
Privacy — Browser-based tools keep sensitive configs safe.

Related Tools

Base64 Encoder/Decoder — encode/decode JSON strings.
XML Formatter — format XML just like JSON.

FAQ

Is JSON formatting free?

Yes, 100% free with no sign-up.

Are my JSON files uploaded?

No. All processing happens in your browser. Your data never leaves your device.

How do I fix invalid JSON?

The validator shows the exact error location. Fix that syntax error and reformat.