JSON Formatter
FreePrettify and format JSON with syntax highlighting
{
"name": "Mehul",
"tools": [
"json",
"sql"
],
"active": true
}About JSON Formatter
API responses, config files, and logs often arrive as one unreadable line of JSON. The JSON Formatter rewrites that compact string into clean, indented structure so you can actually see the keys, nesting, and arrays you're working with. It also surfaces syntax problems like a missing comma or unbalanced bracket the moment they break parsing.
Paste your JSON and the tool parses it, then re-serializes it with consistent indentation and syntax highlighting that makes objects and values easy to scan. It's free, runs in your browser, and returns formatted output instantly with no signup. Use it to debug payloads, document fixtures, or just make a blob of data human-readable before you commit it.
Common uses
- Pretty-print a minified API response copied from your browser's network tab to inspect its shape
- Spot a syntax error in a hand-edited config file when your parser throws an unhelpful error
- Format a JSON fixture before pasting it into a test file or documentation
- Read nested webhook payloads or log entries that arrived as a single dense line
- Tidy a package.json or settings file so diffs stay clean and reviewable
How to use
- 1
Configure options
Set your preferences using the options panel below.
- 2
Click Generate
Click the process button to generate your result instantly.
- 3
Copy or download
Copy the result to clipboard or download it directly to your device.
Why ToolHub?
- Clean readable code
- Standards-compliant formatting
- One-click beautify
FAQ
Does formatting change my data?
No. It only adjusts whitespace and indentation. The keys, values, types, and order of your data stay exactly the same.
Will it tell me if my JSON is invalid?
Yes. The tool parses your input first, so malformed JSON will fail to format and point you toward the problem area.
Can it handle large JSON files?
It handles typical API payloads and config files comfortably. Extremely large documents may be slower since formatting happens in the browser.
Are comments allowed in the input?
Standard JSON does not support comments, so inputs with comments will not parse. Remove them before formatting.
Can I use JSON Formatter on mobile?
Yes — ToolHub is fully responsive and works on iPhone, Android, tablets and all modern browsers. No app install needed.