NestJS · Junior · Question 33 of 75

What does `transform: true` in `ValidationPipe` give you?

1DTO field names are converted to snake_case
✓Correct answer: Payloads are turned into instances of the DTO classes, and primitive params can be converted to the declared types
3Responses are compressed

Explanation

Without it, the handler gets plain objects and strings, even if the parameter is typed as a class or number.

Further reading

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