JSON Formatter & Validator
Free online JSON formatter, validator, and minifier. Prettify JSON data, validate syntax, and debug errors instantly. Secure client-side processing.
What is the JSON Formatter & Validator?
Format, validate, minify, and prettify JSON data online in real-time. Catch syntax errors instantly. Built for optimal performance, this tool executes client-side directly in your browser without uploading your sensitive data to external servers.
How to use the JSON Formatter & Validator
- Paste your raw, minified, or unformatted JSON directly into the editor or upload a .json file.
- Select your formatting preference: 2-space indentation, 4-space indentation, or compact minification.
- Inspect the live syntax validator; any missing quotes, trailing commas, or bracket mismatches are instantly highlighted with exact line locations.
- Click 'Copy' to grab the formatted JSON to your clipboard or download it as a cleaned .json file.
Example: Formatting & Validating an API Payload
{"status":"ok","code":200,"data":{"user_id":4821,"email":"dev@example.com","roles":["admin","editor"]}}{
"status": "ok",
"code": 200,
"data": {
"user_id": 4821,
"email": "dev@example.com",
"roles": [
"admin",
"editor"
]
}
}Minified API responses are quickly reorganized into human-readable hierarchy with standard 2-space indentation.
Technical Guide & Privacy Assurance
Unlike server-side JSON validators, this tool parses your payload directly inside your browser's JavaScript V8 engine. Your API keys, authorization tokens, and confidential customer payloads never touch any remote server.
Frequently Asked Questions
Is this JSON formatter secure?+
Yes. All processing runs entirely in your browser using JavaScript. Your JSON data is never sent to any server.
How do I format a JSON string?+
Simply paste your unformatted or minified JSON into the input box and click 'Format'. You can customize the indentation size to 2, 4, or 1 space.
Does this tool validate JSON?+
Yes. As you paste or type, the tool instantly checks for syntax errors. If your JSON is invalid, it highlights the exact error message so you can fix it.