ClinicalTrials.gov
US clinical trial registry search
NIH ClinicalTrials.gov v2 API returns structured study records — conditions, interventions, locations and status. Public JSON with no API key on read endpoints.
We probe a documented GET and expect 2xx JSON — full uptime and health score. Open provider docs ↗
On our probe schedule. Uptime charts appear after the first check lands.
GET https://clinicaltrials.gov/api/v2/studies?query.cond=cancer&pageSize=1
{
"studies": [
{
"protocolSection": {
"identificationModule": {
"nctId": "NCT02076503",
"orgStudyIdInfo": {
"id": "2013/1513"
},
"organization": {
"fullName": "St. Olavs Hospital",
"class": "OTHER"
},
"briefTitle": "Pre-operative PET-MR of High Risk Prostate Cancer Patients for Assessment of Cancer Aggressiveness and Lymph Node Status",
"officialTitle": "Pre-operative PET-MR of High Risk Prostate Cancer Patients for Assessment of Cancer Aggressiveness and Lymph Node Status"
},
"statusModule": {
"statusVerifiedDate": "2018-01",
"overallStatus": "COMPLETED",
"expandedAccessInfo": {
"hasExpandedAccess": false
},
"startDateStruct": {
"date": "2014-04",
"type": "ACTUAL"
},
"primaryCompletionDateStruct": {
"date": "2015-05",
"type": "ACTUAL"
},
"completionDateStruct": {
"date": "2015-05",
"type": "ACTUAL"
},
"studyFirstSubmitDate": "2014-02-10",
"studyFirstSubmitQcDate": "2014-02-27"
},
"sponsorCollaboratorsModule": {
"responsibleParty": {
"type": "SPONSOR"
},
"leadSponsor": {
"name": "St. Olavs Hospital",
"class": "OTHER"
},
"collaborators": [
{
"name": "Norwegian University of Science and Technology",
"class": "OTHER"
},
{
"name": "Norwegian Cancer Society",
"class": "OTHER"
}
]
},
"oversightModule": {
"oversightHasDmc": false,
"isFdaRegulatedDrug": false,
"isFdaRegulatedDevice": false
},
"descriptionModule": {
"briefSummary": "Prostate cancer is the most frequent cancer in Norwegian men. For optimal treatment, accurate staging of the disease at the time point of diagnosis is important. The objective of this study is to evaluate the diagnostic potential of a combined PET/MR examination for risk assessment and detection of lymph node metastases. The overall aim of the project is to improve the investigators ability to provide individually tailored treatment to prostate cancer patients.\n\nThe study will include 32 men with high-risk prostate cancer, who are eligible for radical prostatectomy. Informed consent is a requirement for inclusion in the study."
},
"conditionsModule": {
"conditions": [
"Prostatic Neoplasms"
],
"keywords": [
"Neoplasm Staging",
"Positron-Emission Tomography"
]
},
"designModule": {
"studyType": "INTERVENTIONAL",
"phases": [
"NA"
],
"designInfo": {
"allocation": "NA",
"interventionModel": "SINGLE_GROUP",
"primaryPurpose": "DIAGNOSTIC",
"maskingInfo": {
"masking": "NONE"
}
},
"enrollmentInfo": {
"count": 28,
"type": "ACTUAL"
}
},
"armsInterventionsModule": {
"armGroups": [
{
"label": "PET-MR 18F-FACBC",
"type": "EXPERIMENTAL",
"interventionNames": [
"Procedure: PET-MR 18f-FACBC",
"Procedure: histology (gold standard)"
]
}
],
"interventions": [
{
"type": "PROCEDURE",
"name": "PET-MR 18f-FACBC",
"armGroupLabels": [
"PET-MR 18F-FACBC"
]
},
{
"type": "PROCEDURE",
"name": "histology (gold standard)",
"description": "histopathological classification of co-located dissected lymph nodes",
"armGroupLabels": [
"PET-MR 18F-FACBC"
]
}
]
}
},
"derivedSection": {
"miscInfoModule": {
"versionHolder": "2026-07-02"
},
"conditionBrowseModule": {
"meshes": [
{
"id": "D011471",
"term": "Prostatic Neoplasms"
}
],
"ancestors": [
{
"id": "D005834",
"term": "Genital Neoplasms, Male"
},
{
"id": "D014565",
"term": "Urogenital Neoplasms"
}
]
}
},
"hasResults": false
}
],
"nextPageToken": "ZVNj7o2Elu8o3lp3D4Czt-numpOQJJxsaQ"
}curl "https://clinicaltrials.gov/api/v2/studies?query.cond=cancer&pageSize=1"const res = await fetch("https://clinicaltrials.gov/api/v2/studies?query.cond=cancer&pageSize=1");
const data = await res.json();
console.log(data);import requests
res = requests.get("https://clinicaltrials.gov/api/v2/studies?query.cond=cancer&pageSize=1")
print(res.json())/studies?query.cond=cancer&pageSize=1PROBEDUS clinical trial registry search
/studies?limit=5Studies — documented GET route.
/studies?page=1Studies — documented GET route.
We probe a documented GET and expect 2xx JSON — full uptime and health score. Export includes every documented route below.
Not tracked yet. Shape-change history starts once this API joins our probe schedule.
ClinicalTrials.gov: common questions
Is ClinicalTrials.gov free to use?
Yes — ClinicalTrials.gov is a free health & food API. Free tier: Free — limits not published. Whether the free tier allows commercial use is unclear — check the provider docs.
Does ClinicalTrials.gov need an API key?
No — ClinicalTrials.gov needs no API key or signup. You can call it straight away; rate limits still apply (Unpublished).
Can I call ClinicalTrials.gov from the browser?
Yes — ClinicalTrials.gov returns CORS headers over HTTPS, so front-end code can fetch it directly with no backend proxy. Use the fetch snippet on this page, or hit "Run live" to try it now.
Is ClinicalTrials.gov up right now?
ClinicalTrials.gov is catalogued but not yet on our probe schedule, so we don't publish a live status for it. Check the provider's own status page or docs for its current state.