Web Scraping vs API
An API gives you the data a website chooses to share, in a stable, documented format, with a key and a rate limit; web scraping takes the data from the pages people see, so it works where no API exists or the API leaves fields out, but it breaks when the layout changes. Use the official API when it has the fields, volume and terms you need, and scrape the rest. When you scrape, ProxyField residential proxies spread the requests over 412M+ IPs from $1.95/GB; start with the Easy Trial: 1 GB for $2.95.
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On this page 9 sections
Web scraping vs API: the difference in one table
The core difference is control: with an API the data owner decides what you get and how; with scraping you decide, and you carry the maintenance.
| Feature | Official API | Web scraping |
|---|---|---|
| What you get | The fields the provider exposes | Anything shown on the public page |
| Format | Structured JSON or XML, documented | HTML you parse into fields yourself |
| Stability | Versioned; changes are announced | Breaks when the page layout changes |
| Access | API key, often an account and approval | A normal HTTP request, like a browser |
| Limits | Quotas and rate limits per key | The site's tolerance per IP; blocks and CAPTCHAs when exceeded |
| Cost | Free tier, then per call or per plan, set by the provider | Your servers, engineering time and proxy traffic |
| Coverage | Only sites that offer an API | Any public page |
| Terms | The API agreement governs use | The site's terms and the law on collecting public data |
| Maintenance | Low: update when the version changes | Ongoing: fix selectors, handle blocks |
What is an API, for data collection?
An API (application programming interface) is an endpoint a provider publishes so programs can request data directly. You send a request with your key, such as "the product with this ID", and get back JSON with named fields. The provider decides which fields exist, how many requests you may make, and what you may do with the data under its terms.
What is web scraping?
Web scraping is a program that loads the pages people see and extracts fields from them. It reads the HTML, or the page after a browser has run its scripts, and finds each field with a CSS selector or an XPath expression. For the full explainer, see what web scraping is.
Pros and cons of each
Official API, pros:
- Clean, structured data with documented fields.
- Stable: a page redesign does not break your code.
- Clear permission: the terms say what you may do.
- Light on the provider's servers and on your own.
Official API, cons:
- Only the fields the provider chooses to expose; prices, stock or reviews are often missing.
- Quotas and costs set by the provider, which can change.
- Access may need an application, a business account or approval.
- Many sites have no public API at all.
Web scraping, pros:
- Works on any public page, with or without an API.
- You see exactly what a visitor sees, including the price and the ranking in a given country or city.
- No approval process.
Web scraping, cons:
- Selectors break when the layout changes.
- Sites limit requests per IP, so volume needs proxies and careful pacing.
- More engineering: parsing, retries, rendering JavaScript pages.
- The legal side needs a check per site and per data type.
When to use an API and when to scrape
Use this order:
-
Check for an official API
That has the fields you need, at your volume and on terms you can accept. If it fits, use it.
-
Check the page's own data requests
Many pages load their data from JSON endpoints you can see in the browser's developer tools, on the Network tab. Calling them is still scraping, but the data arrives structured.
-
Scrape the HTML
When neither covers the data, for example search results as users see them, competitors' prices, or listings from sites without an API.
-
Mix them
Take what the API offers and scrape only the missing fields, so most of your pipeline stays stable.
A rule of thumb: an API is a contract, scraping is an observation. If you need what the site shows people, including what differs by location, scrape it. If you need what the site guarantees, use the API.
A third option: a scraping API
A scraping API is not the site's API. It is a service that scrapes for you: you send it a URL and it returns the page or parsed data, running the browsers, IPs and retries on its side. It removes the infrastructure, not the dependence on the page layout.
ProxyField offers both routes. For your own scraper, residential proxies rotate the IP on every request or hold a sticky session from 30 s to 36 h, with country, region and city targeting. For data without running scrapers, the web scraping API fetches any URL as plain HTTP for $0.50 per 1,000 successful results, down to $0.20, or with JavaScript rendering for $2.00 down to $1.00, and the Google SERP API returns the results page as JSON for $1.20 down to $0.80 per 1,000. Contact sales. The trade-offs between the two routes are in our guide on scraper API vs proxies.
What each costs
An official API costs what the provider charges: a free tier, then a price per call or a monthly plan. Scraping costs your servers and time plus proxy traffic, which is billed per GB.
Estimate the traffic before you buy: pages × average page size. Fetching 100,000 pages of about 100 KB of HTML each is about 10 GB, which at ProxyField's 10-49 GB rate of $2.79/GB is about $27.90 of residential traffic. Pages rendered in a browser also download scripts, images and fonts unless you block them, so measure a sample of your real targets first. Worked examples by job are on proxies for web scraping.
Terms and the law
An API comes with an agreement you accept, and that agreement governs what you may do with the data. Scraping public pages is governed by the site's terms, copyright, privacy law and computer-misuse law, which differ by country and by data type. Our guide is web scraping legal covers the US, EU and UK rules with their sources.
Web Scraping vs API FAQ
What is the difference between an API and web scraping?
ProxyField's residential IPs, from $1.95/GB, are for the scraping side, and the difference is this: an API returns the data a site chooses to share in a documented format, while web scraping extracts whatever the public page shows and needs maintenance when the page changes. Scrapers usually run through proxies because sites limit requests per IP; an API limits requests per key instead.
What is scraping vs API?
Scraping reads data from the web pages meant for people; an API is a door the site builds for programs. Scraping gives you more coverage, and an API gives you more stability and clear terms.
Is web scraping better than using an API?
Not in general. An API is better when it has the fields and volume you need, because it is stable and clearly permitted. Scraping is better when there is no API, when the API leaves out fields such as prices or rankings, or when you need what visitors see in a specific location.
When should I use web scraping instead of an official API?
When the site has no API, when the API omits the fields you need, when its quotas or prices do not fit your volume, or when you need the page exactly as users see it in a given country or city. Many teams use the API for what it covers and scrape only the gaps.
Does web scraping require an API?
No. A scraper loads the same pages a browser does and reads their HTML, so it needs no API key or access approval. It needs a way to fetch pages at a polite rate and, at volume, rotating IPs.
Does web scraping use APIs?
Sometimes. Many pages load their data from JSON endpoints, and a scraper can call those directly instead of parsing HTML; this is often called API scraping. Those endpoints are not a published API, so they can change without notice.
What's the difference between screen scraping and using an API?
Screen scraping reads what an application displays, through its interface or OCR; an API returns the underlying data in a structured format. Screen scraping is the fallback for systems with no API, and it breaks whenever the interface changes.
What's the difference between a desktop scraper and a cloud API?
A desktop scraper runs on your computer and uses your IP and resources, which suits small jobs. A cloud scraping API runs the fetching on the provider's servers with its own IPs and returns the result, which suits recurring or large jobs.
Does scraping cost less than using an API?
It depends on volume and on the provider's price. A free or low API tier usually beats scraping for small jobs; at high volume, scraping costs servers, engineering time and proxy traffic, about pages × page size in GB. Fetching 100,000 HTML pages of about 100 KB is roughly 10 GB of proxy traffic.
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