JSON Formatter
Format, validate and beautify JSON data
Works great with these tools
Have data in a spreadsheet? Convert it to JSON format first with our free CSV to JSON converter, then beautify it here.
API responses sometimes contain Base64-encoded values inside JSON. Decode them instantly with our Base64 encoder and decoder.
Debugging an API or webhook? Check the DNS records of the server domain using our free DNS checker.
Frequently asked questions
Common questions people ask before using this tool.
What does a JSON formatter do?
It prettifies (indents) minified JSON so you can read nested objects and arrays, and it validates syntax so you catch missing commas, unclosed brackets, or incorrect quote marks before deploying config or API payloads.
Is my JSON uploaded to your servers?
This tool processes JSON locally in your browser for speed and privacy. Your data is never sent to our servers. That said, do not paste production API keys, customer data, or secrets into any online tool unless your security policy explicitly allows it.
Why does my JSON fail to parse?
Common issues include: trailing commas (not valid in strict JSON), single quotes instead of double quotes, JavaScript-style comments, unescaped characters inside strings, and mismatched brackets. The error message line/column number helps you locate the exact problem.
Can I minify JSON as well as beautify it?
Yes. Use minify mode to strip whitespace for production bundles and API payloads where byte size matters. Use beautify mode for human reading and debugging. Always keep backups of original config files before batch minifying.
What is the difference between JSON and JavaScript objects?
JSON is a strict text format: all keys must be quoted with double quotes, strings use double quotes, and there are no comments, trailing commas, or undefined values. JavaScript objects are more flexible and allow these extras. Always use JSON.parse() or a validator when exchanging data between systems.
Can this formatter handle very large JSON files?
Browser-based formatters handle typical API responses (up to a few megabytes) without issues. Very large files (tens of MB) may slow the UI or hit browser memory limits. For large datasets, consider command-line tools like jq or a desktop JSON editor.
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