yup

yup.string()
   .required("Please enter the required field")
   .matches(/^[aA-zZ\s]+$/, "Only alphabets are allowed for this field ")

View another examples Add Own solution

Krish 100200 points

                                    npm i yup --save

Thank you! 4

4 (4 Votes)

4.25

Lionel Aguero 33605 points

                                    import * as yup from 'yup';

let schema = yup.object().shape({
  name: yup.string().required(),
  age: yup.number().required().positive().integer(),
  email: yup.string().email(),
  website: yup.string().url(),
  createdOn: yup.date().default(function () {
    return new Date();
  }),
});

// check validity
schema
  .isValid({
    name: 'jimmy',
    age: 24,
  })
  .then(function (valid) {
    valid; // =&gt; true
  });

// you can try and type cast objects to the defined schema
schema.cast({
  name: 'jimmy',
  age: '24',
  createdOn: '2014-09-23T19:25:25Z',
});
// =&gt; { name: 'jimmy', age: 24, createdOn: Date }

Thank you! 4

4.25 (4 Votes)

4.33

Krish 100200 points

                                    // mixed.oneOf(arrayOfValues: Array&lt;any&gt;, message?: string | function): Schema Alias: equals
// Whitelist a set of values. Values added are automatically removed from any blacklist if they are in it. The ${values} interpolation can be used in the message argument.

// Note that undefined does not fail this validator, even when undefined is not included in arrayOfValues. If you don't want undefined to be a valid value, you can use mixed.required.

let schema = yup.mixed().oneOf(['jimmy', 42]);

await schema.isValid(42); // =&gt; true
await schema.isValid('jimmy'); // =&gt; true
await schema.isValid(new Date()); // =&gt; false

Thank you! 6

4.33 (6 Votes)

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