> ## Documentation Index
> Fetch the complete documentation index at: https://mintlify.com/supertokens/supertokens-core/llms.txt
> Use this file to discover all available pages before exploring further.

# Passwordless Authentication

> API endpoints for passwordless authentication with email or phone

## Overview

The Passwordless API provides endpoints for implementing passwordless authentication using email or phone number. Users can sign in by receiving a one-time code via email or SMS.

## Authentication Flow

1. **Create Code**: Generate a passwordless login code for a user's email or phone number
2. **Consume Code**: Verify the code and complete authentication
3. **Resend Code**: Generate a new code for an existing authentication attempt

## Key Concepts

### Device ID

A unique identifier for each authentication attempt. Used to track code verification attempts and prevent abuse.

### Pre-Auth Session ID

A hashed version of the device ID returned by the API. Used to identify the authentication session.

### User Input Code

The short code (typically 6 digits) that users enter to verify their identity.

### Link Code

A one-time use code that can be embedded in magic links for one-click authentication.

## Endpoints

<Card title="Create Code" icon="plus" href="/api/passwordless/create-code">
  Generate a new passwordless authentication code
</Card>

<Card title="Consume Code" icon="check" href="/api/passwordless/consume-code">
  Verify a code and complete authentication
</Card>

<Card title="Resend Code" icon="rotate" href="/api/passwordless/resend-code">
  Generate a new code for an existing device
</Card>