JSON Formatter & Validator
Format, validate and minify JSON instantly in your browser. Nothing is uploaded and no account is required.
Tip: valid JSON uses double quotes around property names and string values.
Private by design. JSON processing happens locally in your browser. Your text is not uploaded to a server.
How the JSON formatter works
Step 1
Paste your JSON
Put an object or array into the input box. The tool accepts standard JSON syntax.
Step 2
Format or minify
Format makes JSON easier to read. Minify removes unnecessary whitespace for a smaller payload.
Step 3
Copy or download
Copy the result to your clipboard or download it as a .json file.
Frequently asked questions
Does this upload my JSON?
No. Formatting, validation and minification are performed locally in your browser.
What happens when JSON is invalid?
The tool shows a validation error and keeps your original input unchanged so you can fix it.
Can I download formatted JSON?
Yes. After a successful format or minify operation, use Download .json to save the result locally.