Usage notes

Code snippets

curl "https://api.oanor.com/ontology-api/v1/meta" \
  -H "x-oanor-key: oanor_test_..."

await fetch("https://api.oanor.com/ontology-api/v1/meta", {
  headers: { "x-oanor-key": "oanor_test_..." }
});

$ch = curl_init("https://api.oanor.com/ontology-api/v1/meta");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$out = curl_exec($ch);

import requests
requests.get(
    "https://api.oanor.com/ontology-api/v1/meta",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

A real response from this endpoint, captured by the latest health check.

{
    "data": {
        "note": "Biomedical ontologies. /v1/search?query=diabetes (filter ontology=mondo, exact=true) = search terms across 280+ ontologies, returning each term's OBO id, label, ontology & definition; /v1/ontologies = the ontology catalogue (paginate page & size); /v1/ontology?id=mondo = one ontology's metadata (title, version, term count, homepage); /v1/term?ontology=mondo&id=MONDO:0005148 = a term's label, definition, synonyms, IRI & obsolete flag; /v1/parents?ontology=mondo&id=MONDO:0005148 = its direct parent terms; /v1/children?ontology=mondo&id=MONDO:0005148 = its direct child terms. Common ontologies: mondo (diseases), hp (phenotypes), go (gene ontology), uberon (anatomy), cl (cell types), chebi (chemistry), efo, ncit. OBO ids look like MONDO:0005148 or GO:0008150. Data via EBI OLS.",
        "source": "EBI Ontology Lookup Service — OLS4 (ebi.ac.uk/ols4)",
        "endpoints": [
            "/v1/search",
            "/v1/ontologies",
            "/v1/ontology",
            "/v1/term",
            "/v1/parents",
            "/v1/children",
            "/v1/meta"
        ]
    },
    "meta": {
        "timestamp": "2026-06-01T08:14:01.144Z",
        "request_id": "b1d7fd83-a59e-4c78-9f0c-d0c5f4df467f"
    },
    "status": "ok",
    "message": "Meta retrieved",
    "success": true
}