When building authentication systems, implementing two-factor authentication (2FA) is just the first step. Properly testing OTP and TOTP verification flows is equally important.
But many developers run into this issue:
Generating test OTP codes quickly without relying on external devices or SMS.
Recently I started using 2fa.cn
, and it has simplified my testing workflow significantly.
What Makes 2fa.cn Useful?
2fa.cn is a browser-based OTP/TOTP generator that requires no installation.
You can generate verification codes instantly for testing login flows or security features.
Features
Supports OTP & TOTP
No account required
Runs entirely in browser
Fast and lightweight
Free to use
Use Cases for Developers
Testing 2FA login systems
Debugging authentication flows
Learning how TOTP works
Security research and demos
Instead of switching between devices or installing authenticator apps, you can generate codes directly while working.
Conclusion
If you frequently work with authentication systems, having a simple OTP generator can save time and improve efficiency.
2fa.cn is a great addition to any developer’s security toolkit.
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