Responsive login component for React with custom fields.

Usage no npm install needed!

<script type="module">
  import unleashitLogin from 'https://cdn.skypack.dev/@unleashit/login';



NPM npm (scoped) npm bundle size

Customizable React login component in Typescript that validates with a built-in or custom Yup schema. It accepts custom fields, header/footer, social login buttons and forgot password link.

login component


npm install @unleashit/login

Required peer dependencies: react, formik and yup.


class LoginDemo extends React.Component {
  async loginHandler(values) {
    // should return a Promise in the shape of LoginHandlerResponse below
    return await fetch('https://api.example.com/auth', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
      body: JSON.stringify(values),
    }).then(resp => resp.json());

  onSuccess(resp) {
    // set auth state, etc. resp has full server response from loginHandler().
    window.location.href = '/signed-in';

  render() {
    return <Login loginHandler={this.loginHandler} onSuccess={this.onSuccess} />;

export default LoginDemo;

Social Logins

Adding social logins is easy. Simply include them as children and they will display under the main login with a nice separator. You must supply the buttons themselves, but for something fast and nice I recommend react-social-login-buttons.

import { GithubLoginButton, TwitterLoginButton } from 'react-social-login-buttons';

const btnStyle = {
  margin: '10px 0',
  boxShadow: 'none',

render() {
  return (
      loginHandler={() => Promise.resolve({ success: true })}
      onSuccess={(resp) => alert(JSON.stringify(resp, null, 2))}
      <TwitterLoginButton onClick={() => alert('Hello')} style={btnStyle} />
      <GithubLoginButton onClick={() => alert('Hello')} style={btnStyle} />

Custom Fields

It's possible to replace the default fields with custom fields and attributes by adding a customFields prop. The loginHandler will be called with their values after passing validation.

This array of fields will replace the defaults, so don't forget to add email/username and password if you need them. If you create a Yup schema with matching name attributes, it will properly validate.

Currently input, select, checkbox and textarea fields are supported.

      element: 'input',
      type: 'text',
      name: 'username',
      label: 'Username',
      element: 'input',
      type: 'password',
      name: 'password',
      label: 'Password',
      element: 'text',
      type: 'checkbox',
      name: 'persistLogin',
      label: 'Remember me?',
      defaultChecked: true,
      defaultValue: true,

// yup schema
const schema = yup.object().shape({
  username: yup
    .matches(/^[a-zA-Z0-9\._-]+$/, 'Enter a valid username')
  password: yup


Basic namespaced (BEM) css can be imported: import '@unleashit/login/dist/login.css'. CSS Module support is baked in. If you use CSS Modules you can import '@unleashit/login/dist/login.module.css' or import your own custom module targeting the internal classes and pass to the cssModuleStyles prop. Please see CSS in the main readme of the repo for more info.


// loginHandler() should return this shape:

interface LoginHandlerResponse {
  success: boolean;
  errors?: {
    // error msg to print in browser when auth fails
    serverAuth: string;
    // optionally validate anything else on server
    // key is the field's name attr, value is error msg to display
    [key: string]: string;

// customFields prop should be an array of objects in this shape:
interface CustomField {
  element: 'input' | 'select' | 'textarea';
  type: string;
  name: string;
  label: string;
  options?: string[][]; // for select element
  defaultChecked?: boolean; // for checkbox
  custAttrs?: { [key: string]: string };


Name Type Description default
loginHandler (values: any) => Promise<LoginHandlerResponse> Called on submission and after validation. Use to check auth. Should return the above interface required
onSuccess (resp: LoginHandlerResponse) => any Called if loginHandler returns success. Provides the server response from loginHandler. Use to redirect, store auth state, etc. required
schema yup.Schema<LoginSchema> Yup schema to override the default standard validation
header React Component React component to override default header basic header
loader React Component React component to override default loader Logging in...
signupUrl string Url for signup page. Use only if using default header /signup
customFields CustomField[] Array of custom fields. Replaces defaults (including email/password). Custom validation schema will be needed. n/a
forgotPassword boolean Include the default forgot password link true
forgotPasswordLink string Url to forgot password /forgot-password
forgotPasswordText string Forgot password link text Forgot password?
orLine boolean Display a "nice" line rule above social login buttons true (note: requires children)
cssModuleStyles { [key: string]: string } CSS Module object that optionally replaces default. Class names need to match expected names. BEM CSS
children React Children Use for Social login buttons or anything else (displays as footer) n/a