From the course: Mastering Nest.js: Build Scalable Applications with Mastery in Nest.js Framework

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Built-in pipes (ParseIntPipe)

Built-in pipes (ParseIntPipe) - Nest.js Tutorial

From the course: Mastering Nest.js: Build Scalable Applications with Mastery in Nest.js Framework

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Built-in pipes (ParseIntPipe)

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In NestJS, the parseInt pipe is a built-in pipe used for converting request parameters to integers, that is, string to integer. It is often utilized when a route handler expects a numeric parameter, for example, an ID. Let's understand how to implement it practically. Inside the controller file, I'll give the get handler and a method get ID. Then I'll pass the dynamic ID inside the get handler. And in the method, we have to pass the param decorator to fetch the ID value. And within the param decorator, we pass the built in pipes. Let me give the parse int pipe. Now there are different levels in the application where we can specify the pipes. The one which we implemented here is at the parameter level, a pipe which is specific to a parameter within the route handler. Generally all the built-in pipes are specified at the parameter level. The rest of the two levels are route level, which is specified for the entire route handler and global level, which is applied on the entire…

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