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Migrate a legacy auth system with Cursor in an afternoon
A developer used Cursor to move a legacy MD5 session login to JWT with refresh tokens, bcrypt and Google OAuth in about four hours.
- Difficulty
- AdvancedOur rating
- Time to build
- ~4 hours (sourced)From the source
- Monthly cost
- Not reported
- Revenue
- Not reportedWe only show revenue the source states
- Engagement
- No public countThe source shows no number
What they did
Cursor wrote middleware, route changes, refresh logic, the OAuth callback and a password-hash migration.
How it went
He found and fixed a refresh-token race and missing OAuth state check himself, then shipped to staging.
Worth knowing
Review security code line by line, as he did.
Builder recipe
Our own starting point, written from the source. Adapt it to your setup.
Stack
- Cursor
Steps
- Open the repo in your coding agent and describe the goal and constraints.
- Ask for a plan first, then let it implement in small, reviewable steps.
- Run the tests or the app after each step and feed errors back.
- Review the diff before merging.
Starter prompt
Plan a migration from our session auth to JWT + refresh tokens with bcrypt. List every file to change and the rollback plan before writing code.Tags
Read the original
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