ClinicalTrials.gov Scraper

Extract clinical trial data from the official ClinicalTrials.gov API v2. 585K+ studies: conditions, interventions, sponsors, phases, eligibility, outcomes, and locations. No API key, no browser, no proxy.

What does ClinicalTrials.gov Scraper do?

Scrape the U.S. National Library of Medicine's clinical trial registry in four modes:

• Search studies — filter by condition/disease, intervention/drug, sponsor, location, recruitment status, phase, and study type. Returns full flattened records with outcomes, eligibility, and site locations.
• Fetch by NCT ID — pass one or more NCT identifiers, get the same complete record.
• Database size stats — current total study count.
• Field value enums — the canonical value lists for status, phase, study type, and other controlled fields.

The ClinicalTrials.gov v2 API is fully public — no API key, no registration, no license barrier. Rate limit is ~50 requests/minute.

Output fields

Field	Description
nctId	ClinicalTrials.gov identifier
briefTitle / officialTitle / acronym	Title fields
orgStudyId / organization	Study identifiers and organization
overallStatus	Recruiting / Completed / Terminated / etc.
startDate / completionDate / lastUpdatePostDate	Date fields
whyStopped	Reason if stopped early
leadSponsor / leadSponsorClass	Primary sponsor
collaborators	Array of collaborator names
briefSummary / detailedDescription	Study description
conditions	Array of conditions/diseases
keywords	Study keywords
studyType	Interventional / Observational / Expanded Access
phases	Phase array (Phase 1, 2, 3, 4)
allocation / interventionModel / primaryPurpose / maskingInfo	Design
enrollmentCount / enrollmentType	Study size
interventions	Array of interventions with type, name, description
primaryOutcomes / secondaryOutcomes	Outcome measure arrays
eligibilityCriteria	Full eligibility text
healthyVolunteers / sex / minimumAge / maximumAge / stdAges	Eligibility
locations	Array of facility, city, state, country, status
ipdSharing	IPD sharing statement
hasResults	Whether the study has posted results
studyUrl	Direct ClinicalTrials.gov URL

Who is it for?

• Pharmaceutical and biotech teams tracking competitor trial pipelines
• Clinical research organizations (CROs) building site and investigator databases
• Medical researchers sourcing trial populations and outcomes for meta-analysis
• Healthcare investors monitoring pipeline progress by condition and phase
• Patient advocacy groups building trial-finder tools for specific diseases
• AI and RAG builders ingesting clinical trial corpora

Pricing

$1.50 per 1,000 results. No subscription.

Results	Cost
100	$0.15
1,000	$1.50
10,000	$15.00

How to use it

1. Pick a Mode.
2. Enter a Condition, Intervention, Sponsor, or Search Term.
3. Optionally filter by Overall Status, Phase, and Study Type.
4. Set Max Items (default 500).
5. Click Start.

Output example

{
  "recordType": "study",
  "nctId": "NCT04280705",
  "briefTitle": "Adaptive COVID-19 Treatment Trial (ACTT-1)",
  "officialTitle": "A Multicenter, Adaptive, Randomized Blinded Controlled Trial of the Safety and Efficacy of Investigational Therapeutics...",
  "overallStatus": "COMPLETED",
  "startDate": "2020-02-21",
  "completionDate": "2021-04-01",
  "lastUpdatePostDate": "2023-05-15",
  "leadSponsor": "National Institute of Allergy and Infectious Diseases (NIAID)",
  "leadSponsorClass": "NIH",
  "conditions": ["COVID-19"],
  "studyType": "INTERVENTIONAL",
  "phases": ["PHASE3"],
  "enrollmentCount": 1062,
  "enrollmentType": "ACTUAL",
  "interventionCount": 2,
  "interventions": [
    { "type": "DRUG", "name": "Remdesivir", "description": "..." },
    { "type": "DRUG", "name": "Placebo", "description": "..." }
  ],
  "primaryOutcomeCount": 1,
  "primaryOutcomes": ["Time to Recovery"],
  "eligibilityCriteria": "Inclusion Criteria: ... Exclusion Criteria: ...",
  "sex": "ALL",
  "minimumAge": "18 Years",
  "stdAges": ["ADULT", "OLDER_ADULT"],
  "locationCount": 55,
  "locations": [
    { "facility": "Massachusetts General Hospital", "city": "Boston", "state": "Massachusetts", "country": "United States", "status": "COMPLETED" }
  ],
  "hasResults": true,
  "studyUrl": "https://clinicaltrials.gov/study/NCT04280705",
  "scrapedAt": "2026-09-24T12:00:00.000Z"
}

Technical details

• Official ClinicalTrials.gov API v2 — https://clinicaltrials.gov/api/v2. Fully public, no key, no registration.
• Rate limit: ~50 requests/minute (2 requests/second). The actor throttles to 600ms between requests by default.
• Cursor pagination via pageToken — up to 200 studies per page.
• Four modes — search, direct NCT lookup, stats, and enum reference.
• No browser, no proxy — pure REST JSON.
• Flattened output — deeply nested protocol sections (identification, status, design, eligibility, outcomes, locations) are flattened to a single wide row.

Known limits

• Rate limit is 2 requests/second. Large runs (10,000+ studies) take proportional time. 10,000 studies ≈ 50 pages ≈ 60 seconds.
• Eligibility criteria is free text truncated at 5,000 characters.
• Outcome measures are truncated to 20 each (primary and secondary). Full outcome data requires per-study fetches.
• Location lists can be very long for multi-site trials — the full array is included.
• hasResults indicates whether the sponsor has posted results; it does not mean results are complete.

FAQ

Do I need an API key? No. The ClinicalTrials.gov v2 API is fully public with no authentication.

Do I need a proxy? No. Datacenter IPs are accepted at up to ~50 requests/minute.

What's the difference between condition, intervention, and term? condition matches disease/condition fields; intervention matches drug/device names; term searches across all fields.

How do I find NCT IDs? Run search mode first — the nctId field is in every output record. Pass those IDs to study mode for direct fetches.

How do I export data? After a run, go to Storage → Export as JSON, CSV, Excel.

Support

Open an issue on the Actor's page for bugs or feature requests.