InternshipKey terms and common mistakes
The words you will hear in Backend Development work and the mistakes that most often cost interns approvals.
Key terms
| Term | Meaning |
|---|---|
Node.js | JavaScript runtime outside the browser |
require() | CommonJS import |
| Callback | Function called when work finishes |
fs | File system module |
| Express | Minimal Node web framework |
req.params | Values from the path |
next() | Passes to the next middleware |
| Mongoose | MongoDB modelling library |
Common mistakes to avoid
- Trusting client input without validation.
- Returning stack traces or database errors to users.
- Writing queries inside loops (N+1 queries).
- No logging, so production bugs cannot be traced.
Want to go deeper? The free Node.js & Express learning path has short modules, games and a certificate for each module.