> ## Documentation Index
> Fetch the complete documentation index at: https://docs.apilens.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Server-Driven Filtering at Scale

> Why APILens moved endpoint filtering and pagination to backend queries with safe cache in frontend.

## Context

Endpoint analytics started with client-side filtering for fast iteration. As data volume grows, that model degrades quickly.

## What Changed

APILens now uses:

* backend-driven filters, sorting, and pagination
* endpoint options API for filter dropdowns
* short-lived bounded cache on frontend for responsive UX

## Why This Works

* predictable query cost at high cardinality
* no giant payload transfer for table interaction
* consistent behavior across search/sort/page states

## Key Principle

Use client cache for speed, backend queries for truth.