JSON Formatter & Validator

What is a JSON Formatter?

JSON (JavaScript Object Notation) is the most widely used data interchange format on the web. A JSON formatter takes raw, often minified or poorly indented JSON and reformats it with proper indentation and line breaks, making it readable for humans. This is especially useful when debugging APIs, inspecting config files, or reviewing data from web services.

Format vs Minify vs Validate

Format/Beautify: Adds line breaks and indentation for readability. Minify: Removes all unnecessary whitespace to reduce file size (useful before production deployment). Validate: Checks that the JSON is syntactically correct without modifying it — useful when debugging parse errors.

Common JSON Errors

Trailing commas (after the last element), single quotes instead of double quotes, unquoted keys, missing commas between elements, and comments (not valid in JSON) are the most common mistakes. The validator catches all of these and reports the exact error location.