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A programmatic deep research engine. Add web search and AI-powered research to your app—let your users get answers with citations, or run comprehensive multi-step research.
Web data only. This searches publicly available web content. For comprehensive legal research (case law, statutes, regulations), use specialized platforms like Lexis, Westlaw, or OpenLaws.

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Quick start

import Casedev from 'casedev';

const client = new Casedev({ apiKey: process.env.CASEDEV_API_KEY });

// Answer your user's question with citations
const answer = await client.search.v1.answer({
  query: userQuestion,
  includeDomains: ['law.cornell.edu', 'findlaw.com']
});

// Return answer with sources to your user
console.log(answer.answer);
// "In California, the statute of limitations for medical malpractice
//  is 3 years from the date of injury or 1 year from discovery [1]..."

console.log(answer.citations);

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Endpoints

Search

POST /search/v1/search — Web search with domain filtering

AI Answer

POST /search/v1/answer — Get AI answers with citations

Research

POST /search/v1/research — Deep multi-step research

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Use cases

Build these capabilities for your users:
FeatureEndpointExample
Research assistant/researchLet users research topics and get comprehensive reports
Fact verification/answerVerify claims with sourced answers
News monitoring/searchMonitor web for relevant news and updates
Background research/searchFind public records and business information

LLMs

Combine search results with LLMs for deeper analysis and synthesis

Format

Generate polished research reports from search results