Validation of a string or number that is not performing as expected

I have been working with the yup library for JavaScript data validation, but I am encountering unexpected behavior. Despite thoroughly reviewing their documentation, I cannot pinpoint where I am misusing their API. When I run the unit test below, it fails when I expect it to pass. Any suggestions on what might be causing this issue?

import { object, string } from 'yup';

test('validator', async () => {
  let schema = object({
    name: string(),
  });

  expect(await schema.isValid({ name: 123 })).toEqual(false);
});

I am using version 

"yup": "^0.32.11"

I attempted to run this validation within a Jest unit test and it failed. I also looked into other validation methods in their API docs.

javascriptjsonvalidationyup

Answer №1

The outcome follows the expected pattern due to the implementation of the yup library. Utilizing the strict option in a schema prevents the execution of the yup parser, thereby eliminating the chance of converting your number value into a string value through type coercion. When the strict option is enabled, the number value of 123 will undergo validation without type coercion. Consequently, since it is not a string value, the validation will be unsuccessful. In contrast, when the strict option is disabled, type coercion takes place resulting in successful validation.

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