Quick answer: An API gives you structured data through an official channel the data owner built and maintains; web scraping extracts data from the pages a website displays to humans. Use the official API whenever one exists and covers the data you need: it's more stable, faster, and unambiguous permission-wise. Scrape when there's no API, the API is missing fields, it's priced out of reach, or you need data across many sites that will never share an API format.
That's the decision in one paragraph, and it resolves maybe 80% of cases. The interesting part is the other 20%, and the fact that the two approaches have quietly merged into a third option.
What Each One Actually Is
An API (Application Programming Interface) is a contract: the provider says "send a request shaped like this, get JSON shaped like that." The data arrives structured, documented, and versioned. When something changes, there's (usually) a changelog.
Web scraping reads the same pages humans see and extracts the data with selectors or AI. There's no contract: the site owes you nothing, and a Tuesday-afternoon redesign can break your pipeline silently.
The difference isn't technical elegance. It's who bears the maintenance burden. With an API, the provider maintains the interface. With scraping, you maintain it: every selector, against every redesign, forever.
The Real Trade-offs
| Official API | Web scraping | |
|---|---|---|
| Data structure | Clean, documented JSON | You parse it from HTML |
| Stability | Versioned, changelogged | Breaks on redesigns |
| Coverage | Only what the provider exposes | Anything visible on the page |
| Rate limits | Explicit, negotiable | Implicit, enforced by blocks |
| Permission | Unambiguous (you agreed to terms) | Case-by-case; read this first |
| Cost | Free tier → sometimes very expensive | Engineering time + infrastructure |
| Multi-site | One integration per provider | One technique for every site |
Two rows deserve emphasis.
Coverage is scraping's trump card. APIs expose what's in the provider's interest to expose. Amazon has no "competitor price monitoring API." Google offers no official SERP API. Most of the web's information (news sites, directories, forums, product pages) has no API at all. If the data you need isn't in an API, the debate is over before it starts.
Stability is the API's trump card. In my experience, teams consistently underestimate scraping maintenance. The script that took a day to write takes a day per quarter to keep alive, multiplied by every site you scrape. That invisible line item decides more build-vs-buy questions than any feature comparison.
The Decision Tree
- Does an official API exist? Actually check: search "{site} API" and look at the docs. Five minutes here can save weeks.
- Does it have the fields you need, at the freshness you need? APIs often lag the website or omit exactly the field you want (Amazon's Product Advertising API vs. what's on the actual product page, for instance).
- Can you afford it at your volume? Some APIs price small experiments generously and production volumes brutally. Do the math at 100× your prototype volume.
- Three yeses → use the API. Any no → you're scraping. Now decide how to scrape: build (open-source frameworks) or rent (a scraping API). Our tools comparison covers that fork.
The Third Option: Scraping Delivered as an API
Here's where the dichotomy has broken down. A scraping API is exactly what it sounds like: a service does the scraping (rendering, block evasion, retries, parsing) and hands you the result through a clean API contract. You get scraping's coverage with an API's ergonomics.
Concretely, "scrape Google results" without an official API looks like this with link.sc:
curl -X POST https://api.link.sc/v1/search \
-H "x-api-key: YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{"q": "best crm for startups"}'
Back comes structured JSON (organic results, People Also Ask, ads) as if Google had an API for it. Same idea for any URL via the fetch endpoint: page in, clean Markdown out. The maintenance burden (the thing that actually makes scraping expensive) moves to the vendor, whose entire business is keeping it working.
This doesn't repeal the original rule. If a first-party API exists, has your fields, and fits your budget, it still wins; nothing beats data straight from the source. The scraping API is the answer for everything the first-party world doesn't cover, which is most of the web.
The Bottom Line
API when you can, scrape when you must, and when you must scrape, seriously consider renting the hard parts. The worst outcome isn't picking the wrong one. It's spending six months hand-building scraping infrastructure for data that was available behind an API key the whole time, or the reverse: waiting for an official API that a provider has no incentive to ever ship.
Need web data that no official API offers? Create a free link.sc account: fetch and search APIs with 500 free requests a month.