Authentication Tutorial

OAuth 2.0 Implementation

Getting Started

OAuth 2.0 provides secure delegated access to API resources.

1. Register Application

Create an application in your developer portal to obtain client credentials.


// OAuth 2.0 Authentication
const config = {
  clientId: 'YOUR_CLIENT_ID',
  clientSecret: 'YOUR_SECRET'
};

// Refresh token flow
async function getAccessToken() {
  const response = await fetch('https://api.example.com/auth/token', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/x-www-form-urlencoded',
      'Authorization': 'Basic ' + btoa(config.clientId + ':' + config.clientSecret)
    },
    body: 'grant_type=client_credentials'
  });

  const data = await response.json();
  return data.access_token;
}

2. Use Access Token

Add the Bearer token to API requests for secure access.


// Use API with authentication
async function fetchData() {
  const token = await getAccessToken();
  const response = await fetch('https://api.example.com/data', {
    headers: {
      'Authorization': 'Bearer ' + token
    }
  });
  
  return response.json();
}

Security Best Practice

Store credentials in environment variables
Rotate secrets regularly
Use refresh tokens for long sessions

API Key Authentication

Key Management

Simplified authentication for trusted applications and services.

1. Generate API Key

Create a secure API key from your developer dashboard.


// API Key Authentication
const config = {
  apiKey: 'YOUR_API_KEY'
};

// Use API key in requests
async function callApi() {
  const response = await fetch('https://api.example.com/endpoint', {
    headers: {
      'Authorization': 'ApiKey ' + config.apiKey
    }
  });
  
  return response.json();
}

Best Practices

Store API keys securely using environment variables or secure configuration files.

Authentication Tutorials

API Authentication Guide