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Web search API

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A web search API is a service that lets software query a search engine’s index of the Web and receive the results as structured data, rather than through a browser or by scraping a search results page. A program issues a request containing a query and parameters and gets back machine-readable results (typically URLs, titles, and text snippets, alongside news, images, videos, and richer content) ready to use in an AI application.

In short: a web search API is how software searches the Web—send a query, get back structured results to build on, with no browser or scraping required.

How a web search API works

The provider runs the search infrastructure so the developer just sends queries and receives data:

  1. Maintain an index: The provider continuously crawls and indexes the Web, building the searchable corpus behind the API. (Note that scrapers generally do not maintain their own indexes of the Web.)
  2. Authenticate: A developer calls an endpoint with an API key, which identifies the account and meters usage against a plan.
  3. Query with parameters: The request carries the query plus options such as result count, freshness, country, and safe-search.
  4. Rank and return: The service ranks matching pages and returns them as structured JSON, often grouped into web, news, image, and video results.
  5. Consume programmatically: The application parses the structured results to power a search UI; to display or filter by type or freshness; or to feed those results as grounding context to an LLM.

The defining trait is that a web search API turns search into a building block: instead of a page for a person to read, it returns clean data for software to act on.

Web search API vs. consumer search engines and scraping

  • Consumer search engines are websites people visit; a web search API delivers the same kind of capability to software as data.
  • Programmable search engines are the underlying search systems; a web search API is the interface developers use to query it. The terms are sometimes used interchangeably in product marketing, but strictly speaking the API is how applications reach the engine.
  • Scraping parses a rendered results page and is brittle and often disallowed; a true web search API (powered by its own index) provides sanctioned, structured access to results optimized for machine consumption.

Where a web search API is used

  • Building search features: Powering site, app, or vertical search without running a crawler and index yourself.
  • Web grounding and RAG: Supplying fresh, citable web content as the retrieval layer for web grounding and RAG, so a model can answer about the current world.
  • AI agents and tools: Serving as the web-search tool an agent calls to look things up.
  • Brave Search API: An independent web search API backed by Brave’s own index of over 40 billion pages, the Brave Search API has structured endpoints for web, news, images, videos, and local results, plus content pre-extracted for LLM grounding. Like any API, it is accessed by a plan with rate limits, and its coverage, freshness, and latency shape what you can build on it.

A web search API is what connects an application to the live web—the foundation under AI answer engines, grounded assistants, and any product that needs to search rather than be searched.

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