Format with exact error locations, or diff two payloads structurally — nothing leaves your browser.
"Unexpected token at position 4096" is useless until something points at the line. This tool
converts JavaScript's parser errors into line/column and shows the offending snippet. The diff
is structural rather than textual: keys reordered? Not a difference. An array element changed
at index 7 of items? Reported as items[7]: 41 → 42 — which is what
you actually want when comparing two API responses or a staging/prod payload pair.
Comparing live responses? ReqPad keeps every response in history, so grabbing "yesterday's payload" to paste here takes seconds. Related: cURL converter · JWT decoder · Base64
ReqPad saves every request and response on your device — six protocols, searchable. Free to start.