JSON Beautifier Online
Beautify and Indent Any JSON Payload Instantly
Need to use JSON Beautifier Online right now?
Reviewing a config file, an API payload, or a data export in raw JSON form is much easier once it's properly indented and structured. This tool beautifies any pasted JSON instantly, with adjustable indentation, so nested objects and arrays are easy to trace visually.
JSON input
Formatted output
Features
- Runs entirely in your browser
- Privacy-first — your data is never uploaded
- Real-time, instant results
- 100% free, no sign-up required
- Works on desktop, tablet, and mobile
- No installation needed
Who uses this tool?
About JSON Beautifier Online
JSON (JavaScript Object Notation) is the standard data format for APIs, configuration files, and countless developer tools — but raw JSON, especially minified JSON returned by an API or squeezed into a single line in a log file, is nearly unreadable to a human. A JSON formatter (sometimes called a JSON beautifier) takes that compact or inconsistently-formatted JSON and reformats it with consistent indentation and line breaks, turning a wall of `{"a":1,"b":{"c":2}}` into a properly nested, readable structure.
This tool parses your JSON using the browser's native JSON parser (the same engine that powers every JSON.parse() call in JavaScript), which means it validates the structure as a side effect of formatting it — if your JSON has a syntax error, a trailing comma, a missing quote, or a mismatched bracket, you'll see the exact parser error message rather than a silently broken or partial output. This makes it useful not just for formatting valid JSON, but as a first diagnostic step when JSON from an API or config file isn't parsing the way you expect.
You can choose between 2-space and 4-space indentation, the two overwhelmingly common conventions in developer tooling and style guides — 2 spaces is the default in most JavaScript/TypeScript projects and matches what tools like Prettier and ESLint typically enforce, while 4 spaces is more common in Python and some enterprise Java/C# codebases. Whichever you choose, nested objects and arrays are indented consistently at every level, making the data's structure immediately visible at a glance.
Common uses include making a minified API response readable while debugging, cleaning up a config file that's been edited by different tools with inconsistent formatting, or just quickly inspecting the shape of a JSON payload before writing code against it. Everything runs instantly in your browser — no data is ever sent anywhere, which matters when the JSON you're formatting contains real API keys, tokens, or user data from a production system.
How it works
- Paste your JSON. Drop in minified, compact, or inconsistently formatted JSON.
- Choose indentation. Pick 2 or 4 spaces to match your project's style.
- Copy the formatted result. Cleanly indented, readable JSON appears instantly — or a clear error if it's invalid.
Examples
Formatting minified JSON
Input
{"name":"ToolsForge","tools":573,"free":true}Output
{
"name": "ToolsForge",
"tools": 573,
"free": true
}