Validate Metadata.
Assess FAIR Compliance.
Enhance Interoperability and Metadata Quality.

A machine-actionable validation service for repositories and data providers — aligned to OpenAIRE Guidelines v3 and v4, and the OSTrails interoperability framework.

About

Supported Guidelines & FAIR Principles

The OpenAIRE Metadata Validator is a service that checks a repository's compliance with the OpenAIRE Guidelines for repositories and data providers.
FAIR Assessment is grounded in machine-actionable FAIR metrics mapped to the three OpenAIRE Guidelines profiles.

v4OpenAIRE Guidelines for Literature Repositories v3OpenAIRE Guidelines for Literature Repositories v2OpenAIRE Guidelines for Data Repositories

FAIR Principles, operationalised

F

Findable

F1(Meta)data are assigned a globally unique and persistent identifier
F2Data are described with rich metadata
F3Metadata clearly and explicitly include the identifier of the data it describes
F4(Meta)data are registered or indexed in a searchable resource
A

Accessible

A1(Meta)data are retrievable by their identifier using a standardized communications protocol
A1.1The protocol is open, free, and universally implementable
I

Interoperable

I1(Meta)data use a formal, accessible, shared, and broadly applicable language for knowledge representation
I2(Meta)data use vocabularies that follow FAIR principles
I3(Meta)data include qualified references to other (meta)data
R

Reusable

R1Meta(data) are richly described with a plurality of accurate and relevant attributes
R1.1(Meta)data are released with a clear and accessible data usage license
R1.2(Meta)data are associated with detailed provenance
R1.3(Meta)data meet domain-relevant community standards
Capabilities

Everything you need to assess compliance

From single-record validation to full benchmark runs, the service supports multiple OpenAIRE profiles and resource types.

Multi-profile Benchmarks

Run full FAIR assessments against repositories compliant with the OpenAIRE Guidelines v3/v4 and v2 data.

Individual Metric Tests

Isolate and test specific FAIR indicators (F1–R1.3) independently, with detailed pass/fail output.

Machine-actionable API

OSTrails-compliant REST API with Swagger documentation. Integrate validation into your pipeline programmatically.

Guidelines v3 & v4 Support

Covers OpenAIRE Guidelines for Literature (v3/v4) and Data Repositories with cross-version metric coverage.

Benchmarks

Available validation profiles

Select a benchmark to run a full FAIR assessment across all applicable indicators for that resource profile.

OpenAIRE FAIR Guidelines for Literature Profile
13 metrics · F1–R1.3 · OAI-PMH & metadata validation
v4 View →
OpenAIRE FAIR Guidelines for Literature Profile
12 metrics · F1–R1.3 · previous generation support
v3 View →
OpenAIRE FAIR Guidelines for Data Repositories Profile
13 metrics · F1–R1.3 · research data specific checks
v2 View →
Browse all benchmarks →
Metrics & Tests

Individual FAIR indicators

Each indicator is a discrete, machine-actionable metric with metadata and a submittable test endpoint.

Browse all metrics → Run tests →
Developer API

OSTrails-compliant REST API

Machine-actionable endpoints for benchmarks, metrics, and individual tests. Integrate FAIR assessment directly into your repository pipeline.

GET /osTrails/benchmarks/{name} Benchmark metadata GET /osTrails/metrics/{id} Metric definition POST /osTrails/tests/{id} Run a test POST /osTrails/tests/{benchmark} Full benchmark run
OSTrails API Docs (Swagger) → 
# Run a FAIR test via the API
curl -X POST \
  https://beta.services.openaire.eu\
/osTrails/tests/F1_v4 \
  -H 'Content-Type: application/json' \
  -d '{
            "subject": "https://repo.example.eu/oai"
  }'

# Fetch benchmark definition
curl \
  https://beta.services.openaire.eu\
/osTrails/benchmarks/\
OpenAIRE%20FAIR%20Guidelines%20\
for%20Literature%20Profile%20v4