JSON FORMATTER & VALIDATOR
Format, validate, and minify JSON instantly in your browser. Syntax error detection with line numbers, copy/download, and file size stats.
// FAQ
FREQUENTLY ASKED QUESTIONS
Q1.Is my JSON data sent to a server?
No. All formatting and validation happens locally in your browser using JavaScript's built-in JSON.parse(). Your data never leaves your device.
Q2.What errors will the validator catch?
Any syntax error that makes JSON invalid: missing commas, unclosed brackets, trailing commas, unquoted keys, single quotes instead of double quotes, and more. The error message will show the position where parsing failed.
Q3.What's the difference between Format and Minify?
Format (prettify) adds indentation and line breaks to make JSON human-readable. Minify removes all whitespace to produce the smallest possible file size — useful for APIs and production data.
Q4.Is there a size limit?
No enforced limit, but very large JSON files (10MB+) may be slow to process depending on your browser and device.
Q5.Can I use this for JSON5 or JSONC (with comments)?
No — this tool uses standard JSON parsing which does not support comments or trailing commas. Remove comments and trailing commas before formatting.
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