To validate email address formats and domains in a Next.js application, you can utilize several libraries that provide robust functionality. Here are the top five libraries you can consider:

Top 4 Email Validation Libraries for Next.js

• Yup

  • Description: Yup is a schema validation library that works well with form management libraries like Formik. It allows for easy validation of email formats and can be integrated seamlessly into React applications.
  • Usage Example:

  import * as Yup from 'yup';
  
  const validationSchema = Yup.object().shape({
    email: Yup.string()
      .email('Invalid email format')
      .required('Email is required'),
  });
  

• Validator.js

  • Description: A lightweight library that provides a simple and effective way to validate various types of input, including email addresses. It includes an isEmail() method that checks for valid email formats.
  • Usage Example:

  const validator = require('validator');
  
  if (validator.isEmail(emailInput)) {
    console.log('Valid email!');
  } else {
    console.log('Invalid email!');
  }
  

• email-validator

  • Description: This library focuses specifically on validating the format of email addresses. It's straightforward to use and provides fast validation.
  • Usage Example:

  const EmailValidator = require('email-validator');
  
  const isValid = EmailValidator.validate('[email protected]'); // true
  

• React Hook Form (with Yup)

  • Description: React Hook Form is another popular library for managing forms in React applications. It works well with Yup for schema-based validation, making it a great choice for validating emails.
  • Usage Example:

  import { useForm } from 'react-hook-form';
  import * as Yup from 'yup';
  import { yupResolver } from '@hookform/resolvers/yup';
  
  const schema = Yup.object().shape({
    email: Yup.string().email().required(),
  });
  
  const { register, handleSubmit, errors } = useForm({
    resolver: yupResolver(schema),
  });
  
  const onSubmit = data => {
    console.log(data);
  };
  
  <form onSubmit={handleSubmit(onSubmit)}>
    <input name="email" ref={register} />
    {errors.email && <p>{errors.email.message}</p>}
    <button type="submit">Submit</button>
  </form>
  

These libraries provide a variety of options for validating email addresses in Next.js applications, ensuring that user input is correctly formatted and reducing the likelihood of errors during data submission.

To validate email addresses using the Zod library in your Next.js application, you can create a schema that checks for valid email formats. Here's how to do it effectively:

Email Validation with Zod

1. Install Zod

First, ensure that you have Zod installed in your project. You can do this by running:

npm install zod

2. Import Zod

Import Zod into the file where you want to perform the validation:

import { z } from 'zod';

3. Create an Email Validation Schema

You can define a schema that validates the email format using Zod's built-in methods. Here’s an example of how to create an email validation schema:

const emailSchema = z.string().email({ message: "Invalid email address" });

This schema will check if the input is a string and conforms to the standard email format.

4. Validate an Email Address

To validate an email address, you can use the parse method provided by Zod. Here’s how you can implement it:

const email = '[email protected]'; // Replace with the email you want to validate

try {
  emailSchema.parse(email);
  console.log('Valid email');
} catch (error) {
  console.error(error.errors); // This will log the custom message if the email is invalid
}

5. Using Async Validation (Optional)

If you want to perform additional checks, such as verifying if the email exists in your database, you can use the refine method for asynchronous validation. Here’s a basic example:

const asyncEmailSchema = z.string().email().refine(async (email) => {
  // Replace this with your actual API call or logic to check if the email exists
  const exists = await checkEmailInDatabase(email);
  return !exists; // Return true if it does not exist
}, {
  message: "This email is not in our database",
});

6. Integrating with Forms

If you're using forms in your Next.js application, you can integrate this schema with form handling libraries like React Hook Form or Formik for seamless validation and error handling.

By following these steps, you can effectively validate email addresses in your Next.js application using Zod, ensuring that user inputs are correctly formatted and meet your application's requirements.
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