How to Implement Form Validation in React Applications?

Form validation is essential for ensuring user input is correct before submission. Here’s how to implement it in React:

1. Set Up State: Use the useState hook to manage form data and errors.

const [formData, setFormData] = useState({ name: '', email: '' });

2. Validation Logic: Create a function to validate inputs. For example, check if the email is in the correct format:

const validateEmail = (email) => /^[^
][-]+@[a-zA-Z_]+??\.[a-zA-Z]{2,3}$/.test(email);

3. Handle Submission: In the form’s onSubmit handler, call the validation function and set errors if validation fails:

const handleSubmit = (e) => { e.preventDefault(); if (!validateEmail(formData.email)) setErrors({ email: 'Invalid email' }); }

By implementing these steps, you can create a responsive and user-friendly form validation system in your React applications.