API Response Formatter - Free Online Tool

API Response Formatter - Read Any API Response at a Glance

Paste a raw API response - minified JSON, XML blob, or anything from a curl output - and get it back formatted with proper indentation, syntax highlighting, and structural metadata: total field count, maximum nesting depth, array sizes, and a summary of all detected data types. Syntax errors are flagged with the exact line and character position.

Debugging an API integration often starts with reading the response. A minified 3KB JSON payload is essentially unreadable. Pasting it into this formatter makes the structure immediately visible - you can see what fields exist, where the data you need is nested, and whether the response matches what the documentation promised.

What Gets Analyzed

For JSON: field count at root level and total, maximum nesting depth, array sizes for each array property, data type distribution (how many strings, numbers, booleans, nulls), and a minified version for compact copying. Syntax validation with precise error location. For XML: element count, attribute count, namespace detection, and well-formedness check.