JSON Formatter
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About this tool
JSON Formatter formats compressed JSON into readable indented form, or minifies it into a single line. Validates syntax and shows errors for invalid input.
Use cases: debugging API responses, editing config files, inspecting data structures.
Frequently asked questions
Is my JSON sent to a server?
No. Formatting, validation and minifying all run locally in your browser — your data never leaves your device.
What's the difference between formatting and minifying?
Formatting adds indentation and line breaks for readability; minifying strips all unnecessary whitespace to produce the smallest valid JSON for transport.
Why does it say my JSON is invalid?
Common causes are trailing commas, single quotes instead of double quotes, unquoted keys or mismatched brackets. The error points to where the problem is.