ClinicalTrials.gov API
by clinicaltrials.gov
Health
Added on November 7th, 2026
Checked and working on November 7th, 2026
Visit clinicaltrials.gov →
What it does
The ClinicalTrials.gov API from the US National Library of Medicine searches more than 500,000 clinical studies from around the world, with their conditions, treatments, locations, status and results, for example to find recruiting trials for a disease near a city. Responses are JSON (or CSV), and an OpenAPI specification describes every field. Free, no key needed.
At a glance
- API key
- Not needed · More APIs with no key
- Pricing
- Free, no key needed.
- From the browser
- Yes (CORS)
- Formats
- JSON
- Interface
- REST, HTTP-GET
- Provider
- clinicaltrials.gov
- Last checked
- Working on November 7th, 2026
More information: https://clinicaltrials.gov/data-api/api
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Example request
curl
curl 'https://clinicaltrials.gov/api/v2/studies?query.term=asthma&pageSize=1'JavaScript
const response = await fetch("https://clinicaltrials.gov/api/v2/studies?query.term=asthma&pageSize=1");
const data = await response.json();
console.log(data);Python
import requests
response = requests.get(
"https://clinicaltrials.gov/api/v2/studies?query.term=asthma&pageSize=1",
timeout=30,
)
print(response.json())The JavaScript works in a web page as well as in Node.js 18 or newer.