Bloated REST API responses

Problem Summary

Bloated REST API responses send more data than the frontend needs, often because endpoints return full objects, unnecessary metadata, or unbounded collections.

Performance Impact

• Larger payloads: More bytes increase transfer and parsing time
• Slower dynamic UI: JavaScript waits for oversized responses
• Database pressure: Endpoints may perform expensive queries
• Memory usage: Large JSON responses cost server and browser memory

How to Detect

1. Network tab: Inspect REST response size and timing
2. Query Monitor: Review database queries during API requests
3. Endpoint testing: Compare requested fields with fields actually used

Solutions

1. Request Only Needed Fields

Use field selection when available instead of returning complete objects.

2. Add Pagination

Avoid returning large collections in one response.

3. Cache Stable Responses

Use transients, object cache, or edge caching for public API data.

4. Design Custom Endpoints Carefully

Return the shape the interface needs, not raw database objects.