Question 258271 in Javascript Question posted in
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Javascript – Error on UnprocessableEntityException in Nest.js

Im fairly new to nest.js and following along a tutorial which you can see here:

https://www.freecodecamp.org/news/build-web-apis-with-nestjs-beginners-guide/

So Im building the validate.pipe.ts and Im getting an error on the following code.

import { Injectable, ArgumentMetadata, BadRequestException, ValidationPipe, UnprocessableEntityException } from '@nestjs/common';

@Injectable()
export class ValidateInputPipe extends ValidationPipe {
   public async transform(value, metadata: ArgumentMetadata) {
      try {
        return await super.transform(value, metadata);
      } catch (e) {
         if (e instanceof BadRequestException) {
            throw new UnprocessableEntityException(this.handleError(e.message.message));
         }
      }
   }

   private handleError(errors) {
    return errors.map(error => error.constraints);
   }
}

This is my code above and my error is

Property 'message' does not exist on type 'string'.

throw new UnprocessableEntityException(this.handleError(e.message.message));
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2

Answers


  1. Chosen as BEST ANSWER
    0

    I passed the e straight in and that seemed to fix the problem

    } catch (e) {
         if (e instanceof BadRequestException) {
            throw new UnprocessableEntityException(e);
         }
      }
    ```

  2. 0

    it should be

    e.message

    not e.message.message in the below line

            throw new UnprocessableEntityException(this.handleError(e.message.message));
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