JSON Formatter and Validator
Validate JSON and format it with two-space indentation or compact it into one line. Invalid JSON is reported without executing any code.
- Free
- No sign-up
- Runs in your browser
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How this calculation works
The parser accepts JSON, not JavaScript, comments or trailing commas. Original number tokens and duplicate keys are preserved. Nesting is limited to 64 levels; this formatter does not interpret object values.
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Discover VISU LinkHow to use it
- Choose an operation and enter the text, or choose a generation quantity.
- Run the tool and check any format warning before using the result.
- Copy the result when ready. Clear the fields to remove it from this page.
Examples
Example 1
{"a":1} formats as an object with an indented a field.
Example 2
[1, 2, 3] compacts to [1,2,3].
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Questions
What does this tool do?
Validate JSON and format it with two-space indentation or compact it into one line. Invalid JSON is reported without executing any code.
What are its format limits?
The parser accepts JSON, not JavaScript, comments or trailing commas. Original number tokens and duplicate keys are preserved. Nesting is limited to 64 levels; this formatter does not interpret object values.
Can I see a worked example?
{"a":1} formats as an object with an indented a field.
Is this text sent to a server?
Text and results stay on this page. Nothing is uploaded or automatically saved. Copying sends the result to your clipboard; downloading creates a local file.
Do I need an account?
No account is required to use the tool or copy its result. VISU services are optional.