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$
USD
I will fix login, signup, oauth and jwt authentication errors in your app
david
About this gig
Are users unable to log in, create accounts, stay signed in, or access protected pages? A broken authentication flow can stop customers from using your app and leave important features inaccessible. If login, signup, OAuth, JWT, sessions, or authentication APIs suddenly fail, you need the problem diagnosed and fixed quickly not another temporary work around.
I can troubleshoot login failures, signup errors, OAuth callbacks, JWT/token problems, session issues, protected routes, authentication API errors, and related frontend/backend connection problems.
WHAT YOU GET:
- Root-cause investigation
- Targeted authentication fix
- Login/signup troubleshooting
- OAuth & JWT debugging
- Session/token testing
- Protected-route testing
- Clear fix summary
BONUS: I'll provide a short explanation of what caused the issue and what was changed.
️ GUARANTEE: The specific authentication issue included in your order will be tested after the fix, so the agreed flow is checked before delivery.
If users are currently blocked from accessing your app, send the error message, screenshot, logs, or reproduction steps so I can assess the issue quickly.
Please message me before ordering!!!
Get to know david
david
developer
- FromNigeria
- Member sinceJan 2026
- Avg. response time6 hours
Languages
English
I help startups, founders, agencies, and businesses build scalable web apps, mobile apps, AI SaaS products, automation systems, and custom business software. My expertise includes Next.js, React, React Native, Expo, Node.js, Supabase, Prisma, Stripe, OpenAI, Claude, n8n, RevenueCat, and Superwall. Whether you need an MVP, AI agent, backend API, dashboard, subscription app, bug fixes, or automation workflows, I deliver reliable, secure, and growth-focused solutions tailored to your business goals.
Other Software Development Services I Offer
FAQ
1. Can you fix my specific login or authentication error?
Yes. I can troubleshoot login, signup, OAuth, JWT, session, token, protected-route, and authentication API issues. Send the error or symptoms before ordering if you are unsure about the scope.
2. Can you fix both frontend and backend authentication problems?
Yes. I can investigate problems across the authentication flow, including frontend forms, API requests, backend authentication logic, tokens, sessions, and protected routes.
3. My users cannot log in right now. Can you handle an urgent fix?
Yes, when the issue fits the selected package. Choose the appropriate delivery option and provide the error details immediately so I can begin with the agreed scope.
4. Can you fix Google or other OAuth login problems?
Yes. I can troubleshoot OAuth configuration, callback/redirect problems, provider responses, token handling, and related authentication errors.
5. Can you fix JWT and token errors?
Yes. I can investigate issues involving JWT creation, validation, expiration, storage, authorization headers, and protected API requests within the existing application.
6. What do you need from me to start?
Usually, I need the relevant project/code access, the error message or logs, steps to reproduce the problem, and relevant configuration details. Never send passwords or private secret keys directly in Fiverr chat.
7. Will you test the authentication after fixing it?
Yes. I test the agreed authentication flow after the fix to verify that the reported issue has been addressed.
