JSON Formatter & Prettifier
Format, validate, and beautify unformatted JSON strings with clean indentation.
How It Works & Processing Standards
Format, validate, and beautify unformatted JSON strings with clean indentation.
Your input data is never sent to any server and is securely processed on your device.
Current Limits
- Desktop max file size: 50MB
- Mobile max file size: 20MB
JSON Formatter & Prettifier is a 100% free, browser-based online utility. All calculations and file conversions run locally inside your browser (Local-First) without sending data to remote servers, keeping your documents and inputs strictly private.
How to Use JSON Formatter & Prettifier
- 1Paste JSONPaste raw, minified, or messy JSON into the input box.
- 2Choose IndentationSelect 2 spaces, 4 spaces, or tabs.
- 3Copy Prettified JSONCopy the clean, indented JSON with one click.
Examples
Minified API Response
Input: {"status":200,"data":{"id":"u1","active":true}}
Result: {
"status": 200,
"data": {
"id": "u1",
"active": true
}
}
Common Use Cases
- Debugging REST API responses and GraphQL payloads
- Formatting configuration files (package.json, tsconfig.json) for readability
- Formatting sensitive JSON documents containing private database records safely
Frequently Asked Questions (FAQ)
Are my API keys or database tokens safe when pasted here?
Yes. JSON parsing and syntax styling run 100% locally in your browser. No strings are ever transmitted over the network.