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10 Must-Know Techniques for React Form Validation on Submit

Forms are a crucial component of any user interface as they enable the exchange of information between users and applications. However, poorly validated forms can lead to inaccurate or incomplete data in an application’s database, increased load times due to discarded data, and a subpar user experience. 

To prevent these issues and ensure accurate data entry and a seamless user experience, validate forms in React. This article’ll explore ten must-know techniques for React form validation on submission. By implementing these techniques, you can validate user input and maximize the quality of your application’s data.

What is form validation in react?

Form validation in React is essential to verifying the form input data on the client side before submitting it to the server. This validation ensures that the data entered by the user aligns with the required criteria and is accurate, thus preventing any further misleading or erroneous processing.

 In React, validation rules can be established for each form field, encompassing requirements such as specific input formats or values. When validation fails, React displays helpful error messages to guide users in correcting their input. By validating form data in React, errors can be promptly identified and corrected before the form submission, minimizing potential issues and ensuring that only valid data is accepted and processed. 

By incorporating form validation in React, you can enhance the user experience, maintain data integrity, and streamline the overall efficiency of your web application.

Importance of Form Validation

Form validation is of utmost importance in web development. Here are the key reasons why form validation is crucial:

  1. Ensure Data Accuracy: Form validation guarantees that the data entered by users is accurate and meets the required criteria. That prevents submitting incorrect or incomplete information, improving data quality and integrity.
  2. Enhance User Experience: Validating form input in real-time provides immediate feedback to users, helping them correct errors or omissions as they fill out the form. These improve the overall user experience and reduces frustration.
  3. Prevent Security Issues: Form validation is a critical defense against common security vulnerabilities. By validating input data, you can protect against malicious code injection (e.g., SQL injection, cross-site scripting) and ensure that only safe and expected data is processed.
  4. Save Server Resources: Validating form data on the client side before submission reduces unnecessary requests to the server. That saves server resources and improves the application’s performance and scalability.
  5. Reduce Errors and Increase Efficiency: By catching and addressing errors before form submission, form validation helps minimize the occurrence of processing errors and avoids the need for additional manual data corrections. That increases efficiency and saves time for both users and developers.
  6. Maintain Data Integrity: Validating form input ensures that only valid and complete data is processed and stored. That helps maintain data integrity and prevents inconsistencies or issues arising from poorly formatted or invalid input.
  7. Comply with Business Rules: Form validation allows you to enforce specific business rules and requirements. By validating input against predefined criteria, you can ensure compliance with data standards, regulatory requirements, and other business rules.

Must-Know Techniques

Real-Time Validation

Real-time validation is an effective technique to provide immediate feedback to users as they fill out a form. It helps prevent errors by checking the input as it is entered. For example, if a user types an invalid email address, real-time validation can display an error message or highlight the red field immediately. This technique improves the user experience by reducing frustration and ensuring accurate data entry.

Controlled Components

Controlled components in React are components that manage their state. Using controlled components for form inputs gives developers more control over the validation process. They can define the validation rules, handle error messages, and prevent submission until all valid inputs. Controlled components are preferred for complex validation scenarios as they allow for fine-grained control over user input and error handling.

Uncontrolled Components

On the other hand, uncontrolled components allow users to input data without strict validation. This technique can be useful when a form requires many inputs or when working with data that doesn’t require strict validation. However, uncontrolled components are unsuitable for critical fields or when dealing with sensitive data where strict validation is necessary.

Schema Validation

Third-party validation libraries like Formik, Yup, or react-hook-form provide ready-to-use solutions for form validation in React. These libraries offer features such as automatic error handling, form state management, and integration with popular UI frameworks. By leveraging third-party libraries, developers can save time and effort in implementing form validation and benefit from the extensive features and community support provided.

Third-Party Libraries

Third-party validation libraries can offer swift and impressive results for form validation, providing developers with pre-existing APIs to validate entries with complex data models. Some top names in validation libraries like Formik or react-hook-form help React developers significantly reduce the time required to build user-friendly, data-secure forms.

Custom Validators

Custom validators allow developers to define validation rules specific to their application or business environment. While third-party libraries provide common validation rules, custom validators can be used to enforce business-specific rules or complex validation scenarios. They require more effort to implement but enable precise validation tailored to the application’s requirements.

Visual Feedback

Visual feedback to users during form validation can greatly improve the user experience. Visual cues like highlighting erroneous fields, displaying error messages near the relevant inputs, or using color-coded indicators can help users identify and correct their mistakes. Visual feedback ensures that users clearly understand what needs to be corrected and reduces the chances of submitting invalid data.

Accessible Error Messages

Accessible error messages are important for users with disabilities or those using assistive technologies. Form validation errors should be accompanied by clear and descriptive error messages that provide information about the issue and guidance on fixing it. By ensuring error messages are accessible, developers can provide an inclusive user experience and assist all users in completing the form accurately.

Test Your Validation

Regular testing form validation is crucial to ensure all validation rules work correctly. Automated testing tools can simulate user interactions and validate that the expected behaviors and validation rules function as intended. That helps catch potential defects or issues and ensures the validation process is reliable and robust.

Graceful Degradation

Graceful degradation ensures that form validation works smoothly on older browsers that may not support the latest validation features. By designing the form to degrade gracefully, users on older browsers can still experience meaningful error messages and be alerted to any validation issues. This approach ensures a consistent and reliable user experience across different browser versions.

React Form Validation on Submit

React form validation example:

Here’s an example of form validation implemented using React:

import React, { useState } from ‘react’;function App() { const [formData, setFormData] = useState({ username: ”, email: ”, password: ”, confirmPassword: ” }); const [formErrors, setFormErrors] = useState({ username: ”, email: ”, password: ”, confirmPassword: ” }); const handleInputChange = (event) => { const { name, value } = event.target; setFormData((prevFormData) => ({ …prevFormData, [name]: value })); }; const handleSubmit = (event) => { event.preventDefault(); // Perform validation logic here }; const validateForm = () => { // Define validation rules here let valid = true; let errors = {}; if (!formData.username) { errors.username = ‘Please enter your username’; valid = false; } if (!formData.email) { errors.email = ‘Please enter your email’; valid = false; } if (!formData.password) { errors.password = ‘Please enter your password’; valid = false; } if (formData.password !== formData.confirmPassword) { errors.confirmPassword = ‘Passwords do not match’; valid = false; } setFormErrors(errors); return valid; }; return ( <form onSubmit={handleSubmit}> <div> <label htmlFor=”username”>Username:</label> <input type=”text” id=”username” name=”username” onChange={handleInputChange} value={formData.username} /> {formErrors.username && <span>{formErrors.username}</span>} </div> <div> <label htmlFor=”email”>Email:</label> <input type=”email” id=”email” name=”email” onChange={handleInputChange} value={formData.email} /> {formErrors.email && <span>{formErrors.email}</span>} </div> <div> <label htmlFor=”password”>Password:</label> <input type=”password” id=”password” name=”password” onChange={handleInputChange} value={formData.password} /> {formErrors.password && <span>{formErrors.password}</span>} </div> <div> <label htmlFor=”confirmPassword”>Confirm Password:</label> <input type=”password” id=”confirmPassword” name=”confirmPassword” onChange={handleInputChange} value={formData.confirmPassword} /> {formErrors.confirmPassword && <span>{formErrors.confirmPassword}</span>} </div> <button type=”submit” onClick={validateForm}> Submit </button> </form> );}export default App;

In this example, we create a form with four input fields for username, email, password, and confirm password. We use the useState hook to manage the form data and form errors state. We then define a handleInputChange function to handle input changes and update the form data state accordingly. We also define a handleSubmit function to handle the form submission.

The validate form function defines the validation rules for the form and returns a boolean value depending on whether the form data passes validation. If form data fails validation, it updates the form errors state with appropriate error messages for each field.

We render the form fields and the corresponding error messages in the return statement. When the submit button is clicked, we call the validateForm function to validate the input fields and either prevent form submission or proceed with the submission. As users interact with the form fields, they receive immediate feedback on any errors via the rendered error messages.

Pros and cons of using React for form validation


  1. Easy to Implement: React provides built-in features and libraries to simplify form validation implementation.
  2. Real-Time Validation Feedback: React enables you to provide immediate feedback to users during form filling, reducing the chances of errors and providing a smooth user experience.
  3. Modular and Reusable Components: React’s modular and reusable components make it easy to incorporate form validation logic, improving code maintainability and scalability.
  4. Server-Side Validation: Server-side validation can be integrated with React’s form validation, ensuring data accuracy and security.
  5. Third-Party Libraries: React supports various third-party libraries that simplify form validation implementation and provide additional features.



  1. Client-Side Validation Only: React form validation is primarily implemented on the client side, so additional steps may need to be taken to ensure server-side validation is also carried out.
  2. Complex Validation Rules: Extensive custom code is required for form validation with complex validation rules, leading to increased development time and maintenance costs.
  3. Browser Compatibility Issues: React’s advanced features may lead to compatibility issues with some older browsers, requiring additional development effort to ensure cross-browser compatibility.
  4. Limited Validation Features: Compared to full-featured validation libraries, React’s validation features may be limited, requiring additional custom code for advanced validation rules or features.

React form validation best practices :

Here are some best practices for React form validation that you might find helpful:

  1. Use form validation libraries: There are many React form validation libraries available, including Formik, Yup, Final Form, and React Hook Form. These libraries can help simplify the form validation process and handle common validation scenarios, such as filling required fields, checking for valid email addresses, and validating phone numbers.
  2. Use controlled components: In React, a controlled component relies on the state to control its behavior. For form fields, this means binding the value of an input field to a state variable and updating the state on every input change. Using controlled components, you can easily validate the user’s input and show errors if necessary.
  3. Use server-side validation: Client-side validation is not enough to improve the security and integrity of your application. Always use server-side validation to validate data before it is processed. That can help prevent malicious attacks and ensure data is stored correctly.
  4. Provide clear error messages: When a user enters invalid data, provide clear and concise messages explaining the issue and how to fix it. These can help users quickly correct their mistakes and move on with the form.

Statistics on the Impact of Poor Validation

Here are some statistics that highlight the impact of poor validation:


  1. Data Inaccuracy: According to a study by Experian, 94% of organizations suspect that their user’s and prospect data is inaccurate in some way. Poor form validation contributes to this problem by allowing incorrect or incomplete data to be captured and stored.
  2. Decreased Conversion Rates: Research conducted by Econsultancy found that 25% of customers abandon online forms due to a lack of validation or errors. These can lead to a significant drop in conversion rates, resulting in lost sales or missed opportunities.
  3. Increased Support Costs: Inaccurate or incomplete data collected through poorly validated forms can lead to more support requests. Data entry errors or missing information can result in customers seeking assistance to rectify the issue, placing a strain on support resources and increasing costs.
  4. Damaged Reputation: Poorly validated forms can negatively impact the perception of your brand or organization. If users encounter frequent errors or find it difficult to provide accurate information, it can erode trust and damage your reputation.
  5. Security Risks: Insufficient form validation techniques can lead to vulnerabilities like SQL injection or cross-site scripting attacks. These attacks can compromise sensitive user data, leading to legal and financial implications.
  6. User Frustration: When users learn validation concerns or cannot submit a form due to unworthy validation, users can get upset and have an unpleasant user experience. This irritation can result in users quitting the process completely, resulting in missed opportunities or despair.

By understanding the statistics showcasing the impact of poor validation, it becomes evident how important it is to implement proper form validation techniques to ensure data accuracy, improve conversion rates, reduce support costs, maintain a positive reputation, enhance security, and provide a seamless user experience.

Diverse Perspectives on React Form Validation

Regarding React form validation, there are numerous perspectives and approaches. Here are a few different ways developers may approach form validation in React:

  1. Server-Side Validation: Some developers believe server-side validation is the most reliable way to ensure data accuracy. This approach involves submitting user data to the server for validation before processing. Server-side validation can provide an extra layer of security and prevent malicious attacks such as SQL injection.
  2. Client-Side Validation: Other developers prefer to validate form data on the client side using JavaScript. This approach can provide a more responsive user experience as validation errors can be caught and displayed in real time without requiring a round-trip to the server.
  3. Third-Party Libraries: Several popular third-party libraries are available for React form validation, such as Formik and React-Hook-Form. These libraries can offer pre-built validation rules and error messaging, making it quicker and easier to implement form validation.
  4. Custom Validation Logic: Some developers prefer to build validation logic tailored to their specific use case. This approach can offer complete control over the validation process and may be necessary for complex forms with unique validation requirements.
  5. Combination Approaches: Some developers may combine multiple approaches to achieve comprehensive and reliable form validation. For example, they may use client-side validation for responsiveness and user experience while supplementing with server-side validation for an added security layer and data accuracy assurance.


React offers high flexibility and is well-suited for building user-friendly applications that help boost productivity while maintaining data integrity. Form validation is critical in ensuring the successful operation of web applications as it helps guarantee the accuracy and completeness of the data received.

By implementing the ten techniques outlined above, you now have the tools to build web forms that collect accurate data, select the most appropriate validation strategy, decrease errors, and enhance the overall user experience. 

Remember that the approach to form validation will depend on your specific use case and project objectives, so take the time to assess your requirements and choose the best method for your application. Effective form validation can improve your application’s data quality, ensure legal compliance, and create an enjoyable user experience.

Frequently asked questions about React form validation on submit :

Form validation on submit refers to validating form input data in a React application once the user submits the form. It ensures that the data entered by the user meets the required criteria and is accurate before further processing.

Form validation on submission is important because it helps maintain data integrity, improves user experience by providing real-time feedback, reduces the likelihood of errors and ensures that only valid and complete data is processed.

Some common techniques include using state and conditional rendering, utilizing controlled components and error messages, leveraging hooks like useState and useEffect, and utilizing libraries such as Formik or React-Hook-Form.

To handle form validation errors in React, you can use conditional rendering to display error messages based on your defined validation rules. When an error occurs, update the state to reflect it and display it to the user.

Yes, you can use third-party validation libraries such as Formik or React-Hook-Form to simplify and streamline form validation in React. These libraries provide pre-built validation rules, error messaging, and other useful features.

To perform server-side validation in React, you need to send the form data to your server and validate it using server-side code or libraries. You can then send back the validation errors to display to the user.

Some strategies to improve the user experience include providing real-time validation feedback, clear and concise error messages, using validation rules that match user expectations, and utilizing loading indicators during form submission.

Yes, security is a critical consideration when implementing form validation. Ensure your validation rules prevent malicious input such as SQL or JavaScript. Additionally, validate user input on the server side to prevent tampering.

You can use JavaScript Promises or async/await syntax to handle asynchronous validation. You can perform asynchronous validation tasks such as API calls or database lookups and await the response before continuing with the form submission.

Testing form validation in React involves simulating user interactions, such as submitting invalid data and asserting that the appropriate validation errors are shown. You can utilize testing frameworks like Jest or React Testing Library.