{"version":"1.0","type":"rich","title":"Gist 6547269","description":"This example shows a caching layer for the npm registry, which retrieves package metadata documents and keeps them in a local LRU cache. It demonstrates how to use the `lru-cache` module for in-memory storage, `couchwatch` to subscribe to real-time changes from the CouchDB-based registry database at `http://isaacs.iriscouch.com/registry`, and `request` to fetch individual package documents on cache misses. When a change row arrives, the corresponding cache entry is deleted, ensuring the cache stays fresh. The code defines a `RegistryCache` constructor with a `get` method that returns cached data or fetches it via HTTP, handling errors and non-200 responses.","provider_name":"VizHub AI Studio","provider_url":"https://next.vizhub.com","html":"<iframe src=\"https://next.vizhub.com/viz/gist-6547269?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"1\"></iframe>","width":960,"height":500,"cache_age":3600}