JSON Formatter
Format and beautify JSON data instantly
JSON Formatter is a free online tool from BrowserUtils that format and beautify json data instantly. It runs entirely in your browser — your data never leaves your device. No account required.
How to use JSON Formatter
- 1 Paste or type your input into the editor above.
- 2 The tool processes your data instantly — right in your browser, with nothing sent to a server.
- 3 Copy the result with one click or continue editing your input.
About JSON Formatter
Free online JSON formatter and beautifier. Paste your JSON and get perfectly indented, readable output with syntax validation. This tool runs entirely in your browser — your data is never sent to a server. Just paste your input, get instant results, and copy with one click. No sign-up or installation required.
JSON Formatter specs
- Runtime
- 100% client-side (browser)
- Built on
- Native JavaScript JSON.parse / JSON.stringify (RFC 8259 compliant)
- Cost
- Free — no account, no rate limits, no usage caps
- Browser support
- Chrome 90+, Firefox 88+, Safari 14+, Edge 90+
- Part of
- 299 developer tools on BrowserUtils (100% client-side)
- Max input size
- Limited only by browser memory — typically 100 MB+ in modern Chromium-based browsers
- Indent options
- 2 spaces, 4 spaces, or tab
- Standards
- RFC 8259 / ECMA-404 (JSON Data Interchange Format)
Questions
What does a JSON formatter do?
A JSON formatter takes compact or poorly formatted JSON data and restructures it with proper indentation and line breaks, making it easier to read and debug.
Is this JSON formatter free?
Yes, this tool is completely free and runs entirely in your browser. Your data never leaves your device.
Can I format JSON in my browser without installing anything?
Yes, this JSON formatter runs entirely in your browser using JavaScript. There is nothing to install and no data is sent to a server.
How many spaces does the JSON formatter use for indentation?
The default indentation is 2 spaces, which is the most common convention for JSON files. The output is valid JSON regardless of the indentation level.
Does the JSON formatter work offline?
Yes, once the page loads, the formatter runs entirely in your browser with no server calls. You can disconnect from the internet and it will still work.
How do I format a JSON API response for debugging?
Copy the raw JSON response from your browser dev tools or API client, paste it into the formatter, and get readable output with proper indentation instantly.
Comments
Related tools
More JSON Tools
JSON ValidatorJSON MinifierJSON to YAML ConverterJSON to CSV ConverterCSV to JSON ConverterYAML to JSON ConverterJSON to XML ConverterXML to JSON Converter
View all JSON Tools tools
Comments