What is a JSON formatter?
A JSON formatter (also called a JSON beautifier or pretty printer) takes compact or messy JSON and prints it with consistent indentation so you can read keys, arrays, and nested objects.
Free tool · JSON Formatter
JSON FormatterBeautify, minify, and validate JSON in your browser.
We don’t store anything. This session only—close the tab and it’s gone.
PrivateComparing two documents? JSON Diff · Compare · JWT Decoder · Env Diff
JSON Formatter
Paste JSON to validate.
0 chars
Ctrl/Cmd + Enter to format. Nothing is stored.
Beautify and validate JSON online
JSON Formatter pretty-prints, minifies, and validates JSON in your browser. It is a free QASignoff tool for reading API payloads and test fixtures without leaving the page.
How to format JSON online
- 1Paste JSON or upload a .json file.
- 2Check the Valid JSON status, or read the parser error if the document is invalid.
- 3Click Format to pretty-print or Minify to compact, then copy the result.
Why use this JSON formatter
- Beautify and validate JSON without sending it to a server.
- Pretty-print API responses, fixtures, and config objects in your browser.
- Minify JSON when you need a compact payload.
- Jump to JSON Diff when you need to compare two documents.
- Use it free, with no account.
Frequently asked questions
How do I validate JSON online?
Paste your JSON into the editor. The tool parses it in your browser with JSON.parse. If the document is invalid, you see the parser error. If it is valid, you can format or minify it.
Does this JSON formatter store my data?
No. Formatting and validation run in your browser. QASignoff does not upload or store the JSON you paste. Close the tab and the session is gone.
What is the difference between format and minify?
Format pretty-prints JSON with two-space indentation. Minify removes extra whitespace so the document is a single compact string—useful for fixtures, logs, or copying into a request body.
When should I use JSON Diff instead of JSON Formatter?
Use JSON Formatter to beautify or check one document. Use JSON Diff when you need to compare two JSON files or payloads side by side. Open JSON Diff
Is this JSON Formatter free?
Yes. JSON Formatter on qasignoff.com is free, requires no account, and does not install software.
Signoff Studio
Format the payload here. Keep the rest in one workspace.
Collections, runners, and sign-off in Signoff Studio.