Scraping API vs scraping: which should you choose?
Should you use a website's official API or scrape it? Both extract data, but they differ in availability, cost, reliability and legal framework. Here's how to choose — and how to combine both.
Official API and web scraping: two ways to get data
An official API is an interface provided by the site owner: it returns structured data (JSON) under defined rules and quotas.
Web scraping reads public pages directly and extracts their content — without prior agreement from the owner, but within the applicable law.
The strengths of an official API
An API is stable, documented and designed for automated use: data arrives already structured, with a guaranteed format and call rate.
It remains bound by its terms of use, an access key and rate or volume limits.
- Structured data (JSON), ready to use
- Stable, versioned and documented format
- Key-based, traceable access
- Rate limits and quotas depending on the plan
The strengths of web scraping
Scraping works on any public page, even without an API: it covers sites that expose no data interface.
It reaches everything displayed — text, prices, images, structure — but requires handling JavaScript, pagination and anti-bot protection.
- No API required: any public page is accessible
- Complete data: text, prices, images, site structure
- Independent of API quotas and price changes
- The trade-off: more fragile to layout changes
API vs scraping: how to choose
The first criterion is availability: if an official API exists and covers your need, it greatly simplifies the work.
The second is scope: to aggregate several sites, compare offers or capture a whole site, scraping is often the only option.
- Availability: does an API exist?
- Scope: one site, several sites, a whole site?
- Freshness: real time (API) or batches (scraping)?
- Structure: clean data or data to extract?
- Volatility: does the layout change often?
Cost and scaling
An API usually charges per call or volume; scraping mainly consumes compute power and bandwidth.
At small scale, an API is simple; at large scale, scraping can become more economical, provided you manage infrastructure and blocking.
- API: per-call, volume or subscription pricing
- Scraping: cost in compute, bandwidth and maintenance
- API: scaling bounded by quotas
- Scraping: scaling controlled on your own infrastructure
Legality and terms of use
Using an API means accepting its terms: access key, quotas, allowed uses. It is the most explicit framework.
Scraping is not unlawful in itself, but it must respect robots.txt, the terms of use and the GDPR as soon as personal data is involved.
- API: clear terms, defined uses and quotas
- Scraping: respect robots.txt and site terms
- Personal data: apply the GDPR (see the dedicated guide)
- API: the most explicit framework for automated use
Combining API and scraping: the hybrid approach
Often the best answer is neither one alone: use the API where it exists, and scrape to complete what it does not cover.
That is ScraperFlow's approach: one unified interface to capture a whole site, extract the data and reuse it — without depending on a single source.
- API when it exists and is enough
- Scraping for the rest of the scope
- Normalise both sources into one format
- One unified interface for the whole ecosystem
Frequently asked questions
Should you use an API or scrape a site?
It depends on your need. If an official API exists and covers the scope you want, it is simpler and more stable. If you must aggregate several sites, capture a whole site or retrieve data no API exposes, scraping is necessary.
Is an API always more reliable than scraping?
No. An API is stable as long as the owner maintains it, but it can change version, price or be restricted. Scraping depends on the site layout: it needs monitoring and adjustments, but stays independent of the owner decisions.
Does scraping cost more than an API?
Not necessarily. An API is billed per call or volume, which can get expensive at scale. Scraping consumes compute and bandwidth but lets you share the infrastructure across many sites.
Can you combine an API and scraping?
Yes, and it is often the best approach. Query the API where it exists for structured data, and scrape to complete the scope. Normalising both into one format avoids depending on a single source.