JSON is everywhere — API responses, config files, data exports, webhooks. And it almost never arrives in a readable state. Here's how to format, validate, and fix JSON instantly at Ultimate Tools .

What JSON formatting actually does

Raw JSON from an API response or a log file often looks like this:

{ "user" :{ "id" : 1 , "name" : "Alice" , "email" : "[email protected]" , "roles" :[ "admin" , "editor" ], "settings" :{ "theme" : "dark" , "notifications" : true }}}

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Formatted (pretty-printed) version:

{ "user" : { "id" : 1 , "name" : "Alice" , "email" : "[email protected]" , "roles" : [ "admin" , "editor" ], "settings" : { "theme" : "dark" , "notifications" : true } } }

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Same data — just structured with indentation and line breaks so you can actually read it. Formatting doesn't change any values.

When you need a JSON formatter

Reading API responses — curl output, Postman, browser DevTools — all return compact JSON.…