hierarchicalChildren: Get hierarchical children

API: ac.uk:embl-ebi-ontology-lookup-service-ols-api
Endpoint: /ontologies/{ontologyId}/terms/{termId}/hierarchicalChildren
Response format: application/json
Auth: none
Method: GET
Last Status: 200
Latency: 300ms

Description

Returns hierarchical children of the specified term (is_a relations only)

Parameters (5)

lang (string, query, optional, default: en)

Language code

ontologyId (string, path, required)

Ontology ID (e.g., 'go', 'efo', 'mondo')

page (integer, query, optional, default: 0)

Page number (0-indexed)

size (integer, query, optional, default: 20)

Page size

termId (string, path, required)

Term IRI (URL-encoded, typically double-encoded)

Examples (1)

Get hierarchical children via termId probe-gate 
curl 'https://www.ebi.ac.uk/ols4/api/ontologies/go/terms/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FBFO_0000004/hierarchicalChildren'
import requests

resp = requests.get("https://www.ebi.ac.uk/ols4/api/ontologies/go/terms/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FBFO_0000004/hierarchicalChildren")
data = resp.json()
import zingu_apis

api = zingu_apis.api("embl-ebi-ontology-lookup-service-ols")
result = api.fetch("ontologies/{ontologyId}/terms/{termId}/hierarchicalChildren")

for item in result:
    print(item)
const resp = await fetch("https://www.ebi.ac.uk/ols4/api/ontologies/go/terms/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FBFO_0000004/hierarchicalChildren");
const data = await resp.json();

Probe History

Latency

Status Codes

TimeStatusLatencySize
2026-04-16 03:10:43.359115 200 300ms
2026-04-15 00:39:42.117931 200 219ms
2026-04-14 03:39:14.192771 200 274ms
2026-04-12 15:41:41.915468 200 243ms
2026-04-10 00:55:57.966600 200 818ms
2026-04-09 02:14:40.711002 200 220ms
2026-04-08 07:20:08.428149 200 216ms
2026-04-07 01:52:10.903860 200 253ms
2026-04-05 19:22:47.803195 200 299ms