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cats
CATS is a REST API Fuzzer and negative testing tool for OpenAPI endpoints. CATS automatically generates, runs and reports tests with minimum configuration and no coding effort. Tests are self-healing and do not require maintenance. (by Endava)
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I've built a tool specifically to test if these kind of characters will reach API backends: https://github.com/Endava/cats. My idea was that APIs should explicitly reject or sanitise input containing such characters.
Vim does not display them all. The only program I checked which displays all such characters is `less -U`. You can test using this file:
https://gitlab.com/nervuri/nervuri.net/-/raw/master/gopher/z...