JSON Formatter Pro
Pretty-print and validate JSON with 2-space indentation. Works entirely in your browser.
Processed locally in your browser — not uploaded to our servers.
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This tool requires a Pro plan.
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Common questions
Are my files uploaded to your servers?
No. JSON formatting runs entirely in your browser using native JavaScript APIs. Your data is not sent to Filecraft servers.
Which plan is required?
JSON Formatter requires a Pro or higher plan.
What indentation is used?
The output uses 2-space indentation, which is the most common standard for JSON formatting.
Does formatting change my data?
No. Formatting only changes whitespace and indentation. Your data values, key order, and structure are preserved exactly.
What happens with invalid JSON?
If your input is not valid JSON, the tool shows an error message describing the problem. You can fix the input and try again without reloading the page.
Is there an input size limit?
Pasted text is limited to approximately 5 million characters to ensure your browser remains responsive. Uploaded .json files are limited by your plan's file size allowance.