ClinicalTrials.gov
Search and retrieve data on clinical trials registered worldwide: conditions, interventions, sponsors, locations and results.
API key
Not required
HTTPS
Supported
Browser calls
Yes, CORS enabled
Status
Not yet checked
How to call it
A starting template for ClinicalTrials.gov. Replace ENDPOINT with the path from the official documentation, which we link above rather than guess at.
# No authentication required.
curl -s "https://clinicaltrials.gov/ENDPOINT" \
-H "Accept: application/json"Where this listing comes from
Aggregated from one public source (custom), then normalised and checked by us.
Report an issue with this listing ↗ClinicalTrials.gov — common questions
Answered from what our own scheduled checks found, not from the provider's marketing.
Is ClinicalTrials.gov free to use?
ClinicalTrials.gov is listed in our free catalogue and required no credential when we called it. It needs no authentication at all, so you can send a request without signing up. Free tiers can still carry rate limits or non-commercial terms, so check the provider's own terms before shipping.
Does ClinicalTrials.gov need an API key?
No. We called ClinicalTrials.gov on our last run with no key, no token and no Authorization header, and it responded. That is what puts it in our no-key collection.
Can I call ClinicalTrials.gov from browser JavaScript?
Yes. ClinicalTrials.gov returned CORS headers when we checked it, so a browser will let your page read the response. You can fetch it directly from client-side JavaScript with no proxy and no backend.
Is ClinicalTrials.gov available over HTTPS?
Yes. ClinicalTrials.gov serves over HTTPS, so you can call it from a secure page without triggering a mixed-content block.