Request validation using serverless framework

Question

I am using serverless framework for the backend. How can I implement request validation? (do not want to write validation inside lambda functions).

Answer 1

In case you are like me and you don't want to add plugins as suggested in "https://stackoverflow.com/questions/49133294/request-validation-using-serverless-framework".

If you set parameters as required and want to validate them, you must add a request validator to your serverless.yml

Resources:
  ParameterRequestValidator:
    Type: AWS::ApiGateway::RequestValidator
    Properties:
      Name: ParameterRequestValidator
      RestApiId:
        Ref: ApiGatewayRestApi
      ValidateRequestBody: false
      ValidateRequestParameters: true

  ApiGatewayMethodNameOfYourApiLookItUpInYourTemplate:
    Properties:
      RequestValidatorId:
        Ref: ParameterRequestValidator

The method you want to validate will be named something like ApiGateway:. You can look the name up when you package your serverless functions in the created template files.

Courtesy for this solutions goes to https://github.com/serverless/serverless/issues/5034#issuecomment-581832806