OAuth 2.0 is the industry-standard protocol for authorization. This guide covers implementing secure OAuth flows.
Grant Types
Authorization Code Flow
typescript
// Step 1: Redirect to authorization server
const authUrl = `https://auth.example.com/authorize?
response_type=code
&client_id=${CLIENT_ID}
&redirect_uri=${REDIRECT_URI}
&scope=read write`;
// Step 2: Exchange code for token
const tokenResponse = await fetch('https://auth.example.com/token', {
method: 'POST',
body: new URLSearchParams({
grant_type: 'authorization_code',
code: authorizationCode,
client_id: CLIENT_ID,
client_secret: CLIENT_SECRET,
redirect_uri: REDIRECT_URI
})
});Client Credentials Flow
typescript
const token = await fetch('https://auth.example.com/token', {
method: 'POST',
body: new URLSearchParams({
grant_type: 'client_credentials',
client_id: CLIENT_ID,
client_secret: CLIENT_SECRET,
scope: 'api:read'
})
});Security Best Practices
- 1Always use HTTPS
- 2Validate redirect URIs
- 3Store secrets securely
- 4Use short-lived tokens
- 5Implement PKCE
Conclusion
OAuth 2.0 provides secure delegated access. Implement carefully following security best practices.