Developer Tools
JSON Formatter
Make your JSON data readable and pretty.
Enter the values and review the result.
Calculation assumptions
- *Input must be valid JSON before it can be formatted.
- *This formatter pretty-prints JSON with two-space indentation.
- *It validates parseable JSON but does not repair broken JSON automatically.
- *Formatting runs in the browser for this tool.
Paste your content to format it.
Formatted output will appear here.
What this JSON formatter does
This tool parses valid JSON and prints it with consistent indentation so objects, arrays, keys, and values are easier to read.
Example: {"name":"Ada","active":true} becomes a multi-line JSON object with each key on its own line.
It does not fix missing commas, unquoted keys, comments, or trailing commas. For adjacent utilities, browse the Developer Tools category.
Common mistakes
- Using JavaScript object syntax instead of strict JSON.
- Leaving trailing commas after the last item.
- Adding comments, which standard JSON does not allow.
- Expecting formatting to repair invalid data automatically.
Transparency note
Accuracy and limitations
Calzivo tools are built for practical estimates, conversions, and checks. Some tools use standard formulas or simplified assumptions, and results can be affected by input accuracy, rounding, units, local rules, or changing official requirements.
Results depend on the values you enter and any simplified assumptions used by the tool. Verify important results before making decisions or submitting official information.
How to Use This Tool
Use these steps to enter the right inputs and interpret the result correctly.
Paste your minified or messy JSON into the input field.
The tool will automatically parse and format it with proper indentation.
If the JSON is invalid, an error message will be displayed.
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Related Guides
Background reading and explanations related to JSON Formatter.
Frequently Asked Questions
Common questions about JSON Formatter and how to read the result.
Is my data secure?
Formatting runs in your browser for this tool, but avoid pasting sensitive data into any web tool unless you are comfortable doing so.
Does it fix invalid JSON?
No. It formats JSON only after the input successfully parses.
Does JSON allow comments?
Standard JSON does not allow comments, so commented JSON will fail to parse.
Can I format arrays?
Yes. Valid JSON arrays and objects are both supported.
Does it minify JSON?
No. This tool formats JSON for readability; it does not provide a separate minify output.
Why did my JavaScript object fail?
JSON requires quoted keys and strict syntax, unlike some JavaScript object literals.