REST API Design Principles That Stand the Test of Time

REST API Design Principles

Good API design makes the developer experience smooth. Here are principles that hold up across projects.

Use nouns, not verbs

Your endpoints should represent resources:

• GET /users — list users
• POST /users — create a user
• GET /users/:id — get a specific user

Be consistent with naming

Pick a convention and stick with it. Use snake_case or camelCase for JSON fields — never mix.

Version your API

Start with /v1/ from day one. You will need it eventually.

Return meaningful status codes

• 200 for success
• 201 for created
• 400 for bad request
• 404 for not found
• 500 for server errors

Wrap-up

The best APIs feel invisible — they do what you expect without needing to check the docs.