How to Format JSON Online

JSON (JavaScript Object Notation) is the standard data format for APIs, config files, and data exchange. Raw JSON from APIs is often minified — all on one line, hard to read. Formatting adds indentation so you can inspect structure, find errors, and debug faster.

When to format JSON

• Debugging API responses from REST or GraphQL endpoints
• Reviewing configuration files before deployment
• Validating JSON syntax before sending to a production API
• Comparing two JSON payloads side by side

How to format JSON in Utiliio

• Copy your raw JSON — from an API response, log file, or config
• Paste it into the JSON Formatter — output updates live as you type
• Switch between Format, Minify, and Validate modes with one click
• Use Copy to grab the result, or Share to send a link with input preserved

Live features that speed up debugging

• Structure preview — see object/array counts and max depth at a glance
• Parse errors show line and column so you can jump to the mistake
• Stats panel — character count, key count, and nesting depth
• Shareable links encode input in the URL for team handoffs

Format vs minify vs validate

Format (pretty-print) adds readable 2-space indentation. Minify removes all whitespace for smaller payloads — useful before sending JSON to an API. Validate checks syntax without changing the output — ideal for CI checks or quick error detection.

Common JSON errors

• Trailing commas after the last item in an array or object
• Single quotes instead of double quotes for strings
• Unescaped special characters inside string values
• Missing closing brackets or braces

The Utiliio JSON Formatter shows the exact parse error with line and column context, making it easy to locate and fix syntax issues quickly.