In this article, we will see how to validate password and confirm password in react js. Sometimes we need to add the password and confirm the password field in react js form. So, we will show you step-by-step how to validate password and confirm password. For password validation, we will use regular expressions and match password and confirm password in react js.

    So, let's see password validation in react js using regex.

    In this step, we will create react application using the following command.

npx create-react-app my-app

    Now, we will create an App.js component file. In this file, we will write validation for password and confirm password.

    src/App.js

import React from "react";
import "./styles.css";

class PasswordValidationForm extends React.Component {
  constructor() {
    super();
    this.state = {
      input: {},
      errors: {}
    };

    this.handleChange = this.handleChange.bind(this);
    this.handleSubmit = this.handleSubmit.bind(this);
  }

  handleChange(event) {
    let input = this.state.input;
    input[event.target.name] = event.target.value;

    this.setState({
      input
    });
  }

  handleSubmit(event) {
    event.preventDefault();

    if (this.validate()) {
      console.log(this.state);

      let input = {};
      
      input["password"] = "";
      input["confirm_password"] = "";
      this.setState({ input: input });

      alert("Form is submitted");
    }
  }

  validate() {
    let input = this.state.input;
    let errors = {};
    let isValid = true;   

    if (!input["password"]) {
      isValid = false;
      errors["password"] = "Please enter your password.";
    }

    if (!input["confirm_password"]) {
      isValid = false;
      errors["confirm_password"] = "Please enter your confirm password.";
    }

    if (typeof input["password"] !== "undefined") {
      if (input["password"].length < 6) {
        isValid = false;
        errors["password"] = "Please add at least 6 charachter.";
      }
    }

    if (
      typeof input["password"] !== "undefined" &&
      typeof input["confirm_password"] !== "undefined"
    ) {
      if (input["password"] != input["confirm_password"]) {
        isValid = false;
        errors["confirm_password"] = "Passwords don't match.";
      }
    }

    this.setState({
      errors: errors
    });

    return isValid;
  }

  render() {
    return (
      <div class="main-div">
        <h5>
          How To Validate Password And Confirm Password In React JS - Websolutionstuff
        </h5>
        <form onSubmit={this.handleSubmit}>         

          <div class="form-group">
            <label for="password">Password:</label>
            <input
              type="password"
              name="password"
              value={this.state.input.password}
              onChange={this.handleChange}
              class="form-control"
              placeholder="Enter password"
              id="password"
            />

            <div className="text-danger">{this.state.errors.password}</div>
          </div>

          <div class="form-group">
            <label for="password">Confirm Password:</label>
            <input
              type="password"
              name="confirm_password"
              value={this.state.input.confirm_password}
              onChange={this.handleChange}
              class="form-control"
              placeholder="Enter confirm password"
              id="confirm_password"
            />

            <div className="text-danger">
              {this.state.errors.confirm_password}
            </div>
          </div>

          <input
            type="submit"
            value="Submit"
            class="btn btn-success submit_btn"
          />
        </form>
      </div>
    );
  }
}

export default PasswordValidationForm;

    In this step, we will import the component into the index.js file. Also, we will import bootstrap.

    src/index.js

import { StrictMode } from "react";
import { createRoot } from "react-dom/client";

import App from "./App";
import "bootstrap/dist/css/bootstrap.css";

const rootElement = document.getElementById("root");
const root = createRoot(rootElement);

root.render(
  <StrictMode>
    <App />
  </StrictMode>
);

    Now, we will add CSS to the styles.css file.

    src/styles.css

.App {
  font-family: sans-serif;
  text-align: center;
}

.main-div {
  margin: 50px;
}

.submit_btn {
  margin-top: 20px;
}

h5 {
  margin-bottom: 20px;
}

input {
  margin: 10px 0 10px;
}

    Now, we will run the server using the following command.

npm start

    Output:

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• Read Also: How To Validate Password And Confirm Password Using JQuery