[Solved] What will NestJS do if a client requests /user/xyz on this route?@Get('user/:id')getUser(@Param('id', ParseIntPipe) id: number) { return id; } | NestJS

NestJS - Pipes

What will NestJS do if a client requests /user/xyz on this route?

@Get('user/:id')
getUser(@Param('id', ParseIntPipe) id: number) { return id; }

AThrow a 400 Bad Request error because 'xyz' cannot be parsed as an integer

BReturn the string 'xyz' as the id without error

CReturn 0 as a default value for id

DIgnore the pipe and treat 'xyz' as a boolean

Step-by-Step Solution

Solution:

Step 1: Understand ParseIntPipe behavior
It attempts to convert the parameter to an integer.
Step 2: Check input validity
'xyz' is not a valid integer, so the pipe throws an error.
Final Answer:
Throws 400 Bad Request error due to invalid integer input -> Option A
Quick Check:
Invalid integer input triggers 400 error [OK]

Quick Trick: ParseIntPipe rejects non-numeric strings with 400 error [OK]

Common Mistakes:

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