Example
{
"name": "TheMachoBird",
"tools": 500
}
JSON Formatter
Format, beautify and validate JSON instantly in your browser. Free online JSON formatter with pretty-printing, indentation control and error checking — no uploads.
Enter the values below, then press Calculate (or press Enter). The calculator updates your results instantly. Try different values to see how your inputs change the outcome.
- JSON to format — enter a value. A typical JSON to format would be Paste minified or messy JSON here….
- Indentation — enter a choice from the options.
- Review your results — the key output is highlighted, with supporting figures below.
Loading calculator…
Results
Formatted JSON
| Detail | Value |
|---|---|
| Valid JSON | |
| Output size (chars) |
What is this calculator for?
Take messy, minified or broken-looking JSON and turn it into readable, properly indented, validated JSON.
How to Use This Calculator
Enter the values below, then press Calculate (or press Enter). The calculator updates your results instantly. Try different values to see how your inputs change the outcome.
- JSON to format — enter a value. A typical JSON to format would be Paste minified or messy JSON here….
- Indentation — enter a choice from the options.
- Review your results — the key output is highlighted, with supporting figures below.
What You'll Need
- JSON to format
- a value · required
- Indentation
- a choice from the options (2 spaces, 4 spaces, 1 tab) · optional
About This Calculator
This JSON formatter parses your input, validates it, and re-prints it with consistent indentation so it is easy to read and debug.
JSON (JavaScript Object Notation) must be strictly valid: double quotes only, no trailing commas, and no comments. If your input has an error, the tool tells you the exact validation message so you can fix it. Choose 2-space, 4-space, or tab indentation to match your team’s convention.
Everything is processed client-side — your JSON never leaves your device, which is especially useful for sensitive configs.
Worked Examples
Frequently Asked Questions
Why does my JSON say invalid?
Common causes: single quotes instead of double quotes, trailing commas, comments, or an extra/missing brace or bracket. The error message from the parser points to the problem.
Is this tool safe for sensitive JSON?
Yes — formatting and validation happen entirely in your browser. Nothing is uploaded, so you can safely format configs, tokens, or API payloads.