Response Modifier

Mock or rewrite API responses in real time with rules, CSV import, and live traffic generation.

The Response Modifier lets you change status codes and response bodies for matching URLs without touching your backend. Enable rules individually, test edge cases, and disable them when done.

Response Modifier — rules list

Rule matching

  • Match by exact URL or wildcard pattern
  • Override HTTP status code and response body
  • Toggle rules on/off without deleting them
  • Body editor with JSON validation

Import and export

Share rule sets across teammates with CSV import and export. Generate rules directly from captured live traffic to mock an endpoint you just observed.

Response Modifier — rule editor