What a JSON formatter does

A JSON Formatter beautifies or minifies JSON: it adds or removes whitespace and indentation. It often also validates so you get both readability and error checking in one step.

What a JSON validator does

A JSON Validator checks syntax only. It tells you if the JSON is valid and where errors are (e.g. missing comma, trailing comma). It does not change the structure or formatting.

Which one to use?

• Use the formatter when you have minified or messy JSON and want it readable (and optionally valid).
• Use the validator when you only need to know if JSON is valid and where it breaks.

Many developers use the formatter first; if it reports errors, fix them then format again. Both tools are free and run in your browser.