JSON Formatter & Validator

How to Use the JSON Formatter

1. Paste your JSON into the input area on the left.
2. Click Format to pretty-print with 2-space indentation.
3. Click Minify to strip all whitespace for production payloads.
4. Syntax errors are highlighted in red so you can locate and fix them instantly.
5. Copy the result or download it as a .json file.

Why Format JSON?

Raw, unformatted JSON is difficult to read and debug. A single missing comma or mismatched bracket causes a parse failure, and the error can be nearly invisible in a dense string. Pretty-printing adds consistent indentation so the structure is immediately visible — nested objects, arrays, and keys become scannable at a glance.

Minified JSON, by contrast, removes all whitespace and newlines to reduce payload size. For REST APIs and configuration files shipped to production, minification can cut transfer size by 20–40% on deeply nested objects.

Common JSON Errors and How to Fix Them

• Trailing comma – JSON does not allow a comma after the last item in an array or object.
• Single quotes – JSON requires double quotes for all strings and keys.
• Unquoted keys – Unlike JavaScript, JSON keys must always be quoted strings.
• Undefined or NaN – These JavaScript values are not valid JSON. Use null instead.
• Comments – JSON does not support comments. Remove them before parsing.

Frequently Asked Questions

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