Backends, APIs and databases
Make data behavior part of the product.
Reviewed 6 October 2026 · 2 min read
Import example project ↗Two named conversations, shared files, revisions and a preview.
Before you start
Describe what data exists, who owns it and who may read/change it. Decide whether it is local, synced or shared.
Build with development data and separate credentials. Never place private keys in a browser bundle or example prompt.
Step by step
- Define a small data model and create/read/update/delete flows.
- Add server-side validation and account-level access checks.
- Handle retries without duplicating single actions.
- Test invalid input, authorization failures, server errors and persistence after restart.
- Back up before schema changes and test migrations on a copy.
Try this
Example request
Add a notes API where each signed-in user accesses only their own notes. Test create, edit, delete, invalid input and cross-account access. Keep credentials off the frontend and document local setup.
Check the result
- One account cannot read another’s records.
- Retries do not duplicate messages or purchases.
- Failures leave data recoverable.
- Migrations have a tested recovery plan.
If something goes wrong
For data disappearing after restart, check the storage path and persistence.
Do not fix access failures by removing authorization globally.
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