Validation Error

• A validation error occurs when data fails to meet the defined criteria or constraints during the validation process.

Request and Response Validation

• Verifying that incoming API requests have the required parameters and that those parameters meet specific criteria like data types. If the specified criteria are not met, it results in a request validation error.
• For more info about Request Validation and its applications, refer this.
• Similarly, When an API response does not meet the expected criteria, it results in a response validation error.

Note

• We utilize the AJV library for validating both request and response data, and the response format adheres to the standard AJV error format.
• The on_request_validation_error and on_response_validation_error handlers are used to override the default errors thrown by the framework (specifically, schema validation errors) and allow developers to customize errors based on their requirements.

on_request_validation_error

• To customize the error response in cases where request schema validation fails, you can utilize the on_request_validation_error handler. Demonstrating its use in the below example

Example

http.get./validation:
  fn: test_validation
  on_request_validation_error: on_request_validation #can be fn path, or a series of tasks
  params:
  - name: num_1
    in: query
    required: false
    schema:
      type: number
  - name: num_2
    in: query
    required: true
    schema:
      type: number

  responses:
    200:
      content:
        application/json:
          schema:
            type: object
      

import { GSContext, PlainObject, GSStatus } from "@godspeedsystems/core";

export default function (ctx: GSContext) {
  const {
    inputs: {
      validation_error
    }
  } = ctx;

  // Extracting message from validation_error input
  const message = validation_error?.data?.message || "Unknown validation error";

  return new GSStatus(false, 400, 'Failed', { message });
}
 

import { GSContext, PlainObject, GSStatus } from "@godspeedsystems/core";

export default function (ctx: GSContext) {
  const {
    inputs: {
      data: {
        query
      }
    }
  } = ctx;

  const responseMessage = `This is number two ${query?.num_2 ?? ''}`;
  return new GSStatus(true, 200, 'OK', responseMessage);
}

Response

• A: Default Error Format

• B: Customized Error

on_response_validation_error

Note

• The framework deals with both request and response errors the same way, except for the error codes and keys.
• For request validation errors, the associated error code is 400, and the key used is on_request_validation_error.
• In the case of response validation errors, the corresponding error code is 500, and the key employed is on_response_validation_error.