---
title: "Validation in java script"
description: "We can use java script to validate user input in html form such as correctness of data. We can use java script to validate required field, email etc."
author: "Anonymous User"
published: 2011-03-15
updated: 2019-09-07
canonical: https://www.mindstick.com/articles/510/validation-in-java-script
category: "javascript"
tags: ["javascript"]
reading_time: 2 minutes
---
# Validation in java script
We can use java script to validate user input in html form such as correctness of data. We can use java script to validate required field, email etc. In this demonstration we learn how to validate use input by using java script.\
##### Validating Required Field
Following code snippet create a user form in which we can check required filed validation.
##### Code:
```
```
On click event of button write down following line of code in java script to validate user input
##### Code:
```
```
##### Output of the following code snippet is as follows
Without entering any value in text field if we click on Log In button then following error message is shown….
After entering value in both fields when we click on Log In button then error messages are invisible.
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Original Source: https://www.mindstick.com/articles/510/validation-in-java-script
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