Caching vs Web Scraping
Both are commonly confused. Here is a side-by-side breakdown of what each one does, when to reach for it, and when it would be the wrong choice.
Web Scraping
Web Scraping = sending a program to read websites and collect information for you. Like hiring a super-fast assistant to copy data from 1,000 web pages in seconds.
Read full block →When to use each
Use Caching when
-
Same data requested repeatedly
Product pages, user profiles, search results, API responses. Anything multiple users (or the same user) request often.
-
Data doesn't change frequently
If your product catalog updates once a day, there's no reason to query the database on every page load
Use Web Scraping when
-
You need data from websites without an API
Many websites don't offer a way to access their data programmatically. No API? Scraping is often your only option to collect product prices, job listings, or real estate data at scale.
-
You want to monitor changes over time
Track price drops, new job postings, or competitor updates. Run your scraper daily (or hourly) and compare the results. Great for price alerts, market research, or staying informed.
-
You need to collect data from many similar pages
Gathering information from 100 product pages, 500 job listings, or 1,000 articles? Scraping shines when you have repetitive tasks across pages that follow the same structure.
-
You're building a dataset for analysis or AI
Training a model, doing research, or building a comparison tool? Scraping lets you collect the raw material you need when no existing dataset covers your niche.
When to avoid each
Avoid Caching when
-
Data must always be real-time
Live stock prices, real-time chat messages, collaborative editing. Stale data here means broken features.
-
Every request is unique
If every query has different parameters and no patterns repeat, caching just wastes memory with zero hits
Avoid Web Scraping when
-
The website offers an official API
APIs are faster, more reliable, and explicitly allowed. If Amazon, Twitter, or your target site has an API, use it. Scraping should be your backup plan, not your first choice.
-
The website's terms of service forbid it
Some sites explicitly ban scraping. Violating terms can get your IP blocked or worse. Check the robots.txt file and terms of service. When in doubt, ask permission or find another source.
-
You only need data once from a few pages
Need 5 prices right now? Just copy them manually. Scraping has setup time. It's worth it for hundreds of pages or repeated tasks, not for a quick one-time lookup.