18 Essential Practices for Designing Robust Backend APIs
The article outlines eighteen critical considerations for designing backend interfaces, ranging from documentation format and unified parameter schemas to encryption, idempotency, versioning, and monitoring, providing interview-ready insights that can impress hiring managers.
A friend faced the interview question "How to design a backend API?" and the author compiled eighteen key aspects that can impress interviewers.
1. Documentation format
Use online documentation or local Word files to describe the API.
2. Unified parameter format
Ensure request and response parameters follow a consistent format.
3. Whitelist design
For special APIs, restrict access to fixed IPs or domains.
4. Single responsibility
Design each API to serve a single purpose, making maintenance easier and callers happier.
5. Parameter validation
Validate incoming parameters before executing business logic to avoid unnecessary exceptions.
6. Encryption
Apply encryption/decryption for APIs with high security requirements to protect data in transit.
7. Unified exception handling
Handle exceptions uniformly and keep the response format consistent.
8. Error codes
Define clear error codes so callers can understand failure reasons.
9. Data masking
Mask sensitive information such as bank card numbers or ID numbers.
10. Rate limiting
Throttle frequently called or time‑consuming APIs to safeguard system performance.
11. Idempotent design
Ensure repeated identical requests do not produce duplicate effects, e.g., duplicate orders.
12. Invocation method
Specify the calling style, such as RESTful or RPC.
13. Request method
State the HTTP method (POST, GET, etc.) used by the API.
14. Versioning
Handle new and old versions, often by including a version segment in the URL (e.g., /v1/).
15. Asynchronous processing
Use asynchronous handling to improve system throughput.
16. Request header settings
Include authentication or session information in request headers when needed.
17. Monitoring
Implement real‑time monitoring to quickly detect and diagnose issues.
18. Batch limit
Define a maximum number of records for bulk operations.
These eighteen considerations form a comprehensive checklist for both interview preparation and practical backend API design.
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