Uttir

JSON Formatter

Format, beautify, and validate JSON with adjustable indentation — instantly in your browser.

JSON Formatter — The JSON formatter takes raw, minified, or messy JSON and rewrites it with consistent indentation and line breaks so you can actually read it. It also validates the document while formatting, so syntax errors are reported with the exact line and column instead of silently passing through.

Your JSON is formatted entirely in your browser and never uploaded anywhere.

What is json formatter?

The JSON formatter takes raw, minified, or messy JSON and rewrites it with consistent indentation and line breaks so you can actually read it. It also validates the document while formatting, so syntax errors are reported with the exact line and column instead of silently passing through.

Because formatting happens locally with your browser’s built-in JSON parser, nothing you paste ever leaves the page — safe for API responses, configuration files, and anything containing credentials or personal data.

How to use it

  1. Paste your JSON

    Drop minified or messy JSON into the input panel.

  2. Pick an indentation style

    Choose 2 spaces, 4 spaces, or tabs to match your project’s style.

  3. Read or copy the result

    The formatted output appears instantly. Use Copy to grab it.

Examples

Minified to readable

A single-line API response becomes structured, readable JSON.

{"id":42,"name":"Uttir","tags":["free","fast"]}

Result: { "id": 42, "name": "Uttir", "tags": [ "free", "fast" ] }

Frequently asked questions

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