JWT for single-page applications

JWT for single-page applications (React, Vue, Angular)

jwt authentication spa react — how JWT authentication works for single-page applications (React, Vue, Angular).

Architecture

JWTs enable stateless authentication ideal for single-page applications (React, Vue, Angular). The client stores an access token and sends it with each request via the Authorization: Bearer header.

Implementation Checklist

• Issue short-lived access tokens (5–15 min)
• Implement refresh token rotation
• Validate signature, exp, iss, aud on every request
• Store tokens securely (httpOnly cookies for web)

Test Your Tokens

Use JWT Decoder, JWT Validator, and JWT Debugger during development.

Understanding JWT for single-page applications in Production

Developers search for JWT for single-page applications when building API authentication with JSON Web Tokens. JWTs are used by OAuth 2.0, OpenID Connect, Auth0, Firebase, AWS Cognito, and Keycloak. Always validate exp, iss, and aud server-side — decoding alone proves nothing about authenticity.

JWT Structure Recap

Every JWT has three dot-separated segments: header (algorithm), payload (claims), signature (proof). Use JWT Decoder to inspect and JWT Validator to verify before trusting any claim value in production code.

Common Pitfalls

• Algorithm confusion (none attack) — whitelist allowed algorithms
• Secrets in the payload — payload is only Base64-encoded, not encrypted
• Ignoring clock skew on exp and nbf
• Weak HMAC secrets — use 256-bit random keys
• Skipping signature verification — always call verify(), not decode()
• Storing tokens in localStorage — XSS can steal them

Further Reading

Browse related resources: JWT Decoder, JWT Validator, JWT Basics, JWT Authentication, JWT Errors, Algorithms, Glossary, and Learning Path.