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.
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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
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Paste your JSON
Drop minified or messy JSON into the input panel.
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Pick an indentation style
Choose 2 spaces, 4 spaces, or tabs to match your project’s style.
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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
Comparison: this tool vs the alternatives
Uttir JSON Formatter vs JSONLint
| Feature | Uttir | JSONLint |
|---|---|---|
| No upload to a server | ✓ | ✗ |
| No signup | ✓ | ✗ |
| No ads on the result page | ✓ | ✗ |
| Custom indentation (2/4/tab) | ✓ | ✗ |
| Sort keys alphabetically | ✓ | ✗ |
| Minify (compact) mode | ✓ | ✓ |
Related guides
How to Explore a JSON File Visually (and Stop Scrolling)
JSON files get long fast. A 5,000-line config file or a 50 KB API response is unreadable as raw text. This guide covers the right way to navigate a JSON document: tree views, search, path navigation, and the moves that turn a wall of text into something you can actually work with.
What Is Regex, and When Should You Actually Use It?
A regular expression is a tiny language for matching patterns in text. It is one of the most useful tools in programming — and one of the most overused. Here is what regex is, the four operators that cover 90% of real-world use, the four signs you should not use regex, and how to test one in your browser before you commit it to production.
How to Compare Two Text Files (and What to Do With the Diff)
Comparing two text files is a daily task for developers, writers, and anyone who edits the same document twice. This guide covers the algorithms, the tools, and how to read a diff once you have one.
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Last reviewed: 2026-09-18