How do you share validation rules between React forms and Express?
PICTURE THIS: STACK VS QUEUE
Simple meaning
Shared schema packages or OpenAPI-generated types.
WHY — Fullstack instead of guessing?
Why interviewers care about Fullstack:
question about Fullstack.
trade-offs, and what you would actually do on a Full Stack project - not buzzwords.
Name the idea, why it exists, then one short example.
End with when you use it and one common pitfall.
STEPS — What happens step by step?
Before you speak the answer, walk the interviewer through these steps:
- 1Shared schema packages or
OpenAPI-generated types.
- 2Why it exists
Duplicated rules drift.
- 3Server validation stays mandatory
even when the client checks first.
- 4Give an example
One tiny concrete case you can say aloud.
- 5Common mistake
What juniors usually get wrong.
- 6Close
When you pick this over the alternative.
EXAMPLE — See it in action
Here's a short line you can speak, broken into clear beats:
Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.
Key takeaway
Shared schema packages or OpenAPI-generated types. Duplicated rules drift.