<SignInButton />

The SignInButton component provides a flexible sign-in button for browser-based Next.js applications using Asgardeo authentication. It supports both render props and traditional children, and can be customized with preferences such as internationalization (i18n).

Overview

The SignInButton component initiates the sign-in flow when clicked. It automatically handles loading state, error handling, and supports custom UI via render props or direct children. You can customize its behavior and appearance using the preferences prop, including i18n overrides.

Usage

You can use the SignInButton in two main ways: as a simple button or with render props for more control over the UI and behavior.

Basic Usage

Use SignInButton as a simple button to trigger sign-in.

SignInButton Example

import { SignInButton } from '@asgardeo/nextjs'

<SignInButton>Sign In</SignInButton>

Note

You can simply use the SignInButton component without any children <SignInButton /> to render a default button with the text "Sign In".

Props

The SignInButton component accepts all props from BaseSignInButton, plus:

Prop	Type	Required	Description
children	ReactNode or function	❌	Render prop function or ReactNode for button content
preferences	Preferences	❌	Customization options for i18n, theming, etc.
onClick	function	❌	Callback after sign-in is triggered

Preferences

The preferences prop allows you to customize UI and internationalization.

Internationalization Preferences (preferences.i18n)

Property	Type	Default	Description
language	string	Browser default	Language code for UI text (e.g., 'en-US')
fallbackLanguage	string	'en-US'	Fallback language when translations aren't available
bundles	object	{}	Custom translation bundles to override default text

Customization

The SignInButton component is designed for easy customization to fit your application's design system.

CSS Classes and Styling

You can use the className prop to apply custom styles:

<SignInButton className="btn btn-primary">
  Sign In
</SignInButton>

Default CSS Classes

The button includes a default vendor-prefixed class for targeting:

• .asgardeo-sign-in-button – Main sign-in button element

CSS Custom Properties (CSS Variables)

You can theme the button and other SDK components using CSS variables:

:root {
  --asgardeo-primary-color: #007bff;
  --asgardeo-primary-hover: #0056b3;
  --asgardeo-border-radius: 8px;
  --asgardeo-font-family: 'Inter', sans-serif;
  --asgardeo-button-padding: 12px 24px;
}

Internationalization (i18n)

Override button text and translations using the preferences prop:

<SignInButton
  preferences={{
    i18n: {
      language: 'fr-FR',
      fallbackLanguage: 'en-US',
      bundles: {
        'fr-FR': {
          translations: {
            'elements.buttons.signIn': 'Connexion personnalisée'
          }
        }
      }
    }
  }}
>
  Connexion personnalisée
</SignInButton>

Render Props for Custom UI

You can customize the button UI and behavior using render props. This allows you to access the signIn function and loading state directly giving you the flexibility to use any library like Tailwind CSS, Shadcn UI, Material-UI, etc.

<SignInButton>
  {({ signIn, isLoading }) => (
    <button
      onClick={signIn}
      disabled={isLoading}
      className="px-4 py-2 bg-blue-600 text-white rounded hover:bg-blue-700 transition disabled:opacity-50 flex items-center gap-2"
    >
      <svg
        className="w-4 h-4"
        fill="none"
        stroke="currentColor"
        strokeWidth={2}
        viewBox="0 0 24 24"
      >
        <path d="M16 17l5-5m0 0l-5-5m5 5H9" />
        <path d="M19 12a7 7 0 11-14 0 7 7 0 0114 0z" />
      </svg>
      {isLoading ? 'Signing in...' : 'Sign In'}
    </button>
  )}
</SignInButton>

Error Handling

If sign-in fails, an AsgardeoRuntimeError is thrown with a descriptive message.

Notes

• Automatically disables the button and shows loading state during sign-in.
• Supports both render props and traditional children for maximum flexibility.