ClinicalTrials.gov

ClinicalTrials.gov Data API v2

The ClinicalTrials.gov Data API v2 is the modern public REST interface to the NIH clinical-studies registry. It exposes study records, study metadata, search areas, study fields, version history, and statistics endpoints. Responses are JSON by default and the API is open and unauthenticated. The base URL is https://clinicaltrials.gov/api/v2 and operations include /studies, /studies/{nctId}, /studies/metadata, /studies/search-areas, /studies/enums, /version, and /stats.

GitHub OpenAPI

Documentation

📖
Documentation
https://clinicaltrials.gov/data-api/api

Specifications

⚙
OpenAPI
https://raw.githubusercontent.com/api-evangelist/clinical-trials-gov/refs/heads/main/openapi/clinical-trials-gov-data-api-v2-openapi.yml

Other Resources

🔗
About
https://clinicaltrials.gov/data-api/about-api

API entry from apis.yml

apis.yml Raw ↑ 
aid: clinical-trials-gov:data-api-v2
name: ClinicalTrials.gov Data API v2
tags:
- Clinical Trials
- REST
- Search
- Studies
image: https://kinlane-productions2.s3.amazonaws.com/apis-json/apis-json-logo.jpg
baseURL: https://clinicaltrials.gov/api/v2
humanURL: https://clinicaltrials.gov/data-api/api
properties:
- url: https://clinicaltrials.gov/data-api/api
  type: Documentation
- url: https://clinicaltrials.gov/data-api/about-api
  type: About
- url: openapi/clinical-trials-gov-data-api-v2-openapi.yml
  type: OpenAPI
description: The ClinicalTrials.gov Data API v2 is the modern public REST interface to the NIH clinical-studies
  registry. It exposes study records, study metadata, search areas, study fields, version history, and
  statistics endpoints. Responses are JSON by default and the API is open and unauthenticated. The base
  URL is https://clinicaltrials.gov/api/v2 and operations include /studies, /studies/{nctId}, /studies/metadata,
  /studies/search-areas, /studies/enums, /version, and /stats.