Most APIs don’t fall over because of one big mistake — they degrade from a dozen small ones. A missing index here, an N+1 query there, no rate limiting until the day you actually need it. The good news is that the fixes are well understood.
Start with the boring fundamentals
Cursor-based pagination beats offset pagination the moment your tables get large. Eager-load relationships to kill N+1 queries. Cache read-heavy endpoints and invalidate them on write. None of this is glamorous, and all of it compounds.
- Version from day one (
/api/v1) so you can evolve without breaking clients. - Return a consistent error shape — clients should never have to guess.
- Rate-limit by API key, not just by IP address.
Bake these defaults into your first endpoint and every one after it inherits them. That’s how a small team keeps an API dependable under real load.
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