# cached-middleware-fetch-next

A Next.js fetch wrapper for edge middleware that uses Vercel Runtime Cache as its caching backend.

## Overview

This library provides a drop-in replacement for the native fetch API that mimics Next.js's Data Cache behavior in edge middleware environments where the standard Data Cache is not available. It implements SWR (Stale-While-Revalidate) caching using Vercel's Runtime Cache and waitUntil() for background refresh.

## Key Features

- 🚀 Drop-in replacement for fetch in Next.js middleware
- 💾 Uses Vercel Runtime Cache for persistence
- 🔄 Supports Next.js fetch options (cache, next.revalidate, next.tags)
- ⏱️ SWR (Stale-While-Revalidate) caching strategy using waitUntil()
- 🎯 Automatic cache key generation (includes body for proper POST/PUT caching)
- 📊 GraphQL Support - Caches POST requests with different queries separately
- 📈 Cache Status Headers - Get detailed cache information via response headers
- ⚡ Graceful fallback to regular fetch if cache fails
- 📦 Lightweight with minimal dependencies

## Installation

\`\`\`bash
npm install cached-middleware-fetch-next