Data hub

Data hub

A central node in a data ecosystem that aggregates, harmonises, and brokers access to data from multiple upstream sources, exposing the harmonised data to downstream consumers via curated APIs, query interfaces, or download endpoints.

ByCASRAI Editorial Board

· Last updated 5 Sept 2026

How it differs from a federated infrastructure and a data lake

A data hub is distinct from a federated data infrastructure, where data stay distributed at their sources and are queried in place rather than centrally copied and harmonised — a federation trades central control for avoiding duplication and preserving source ownership. It is also distinct from a data lake: a lake is schema-on-read, storing data close to its raw upstream form and deferring structure until query time, whereas a hub typically applies its harmonised model up front (schema-on-write), and is closer in spirit to a curated data warehouse aimed at a specific consuming community.

Research-context examples

The European Marine Observation and Data Network (EMODnet) operates as a marine data hub, aggregating observational data from member institutes across Europe into harmonised, discipline-standard products. Health Data Research UK’s Innovation Gateway operates similarly for UK health datasets: it indexes and brokers access requests to datasets that continue to be held by their originating institutions, centralising discovery and request-handling even where the underlying data does not physically move. Not every “gateway”-branded service is a data hub in this strict sense — some are pure catalogues (discovery only, no harmonisation) closer to a federated model; check what actually happens to the data, not just the product name, before classifying a given service.

Worked example / counter-example

A national research funder that stands up a service ingesting grant, output and researcher metadata from dozens of institutional CRIS systems, resolving inconsistent identifiers into one harmonised record set, and exposing that through a single API is operating a data hub. A one-off, point-to-point integration between exactly two systems is not a data hub — the pattern requires multiple upstream sources feeding one harmonised centre. Similarly, a single original-source repository that has not aggregated anything from elsewhere is a source, not a hub, even if it exposes a well-documented API.

References

Smith, G., “Designing Data Hubs,” Communications of the ACM 64(11), 2021.

Use in your systems

JATS XML <role> element

xml

<role vocab="credit"
      vocab-identifier="https://casrai.org/dictionary/"
      vocab-term="Data hub"
      vocab-term-identifier="https://casrai.org/dictionary/term/data-hub" />

Schema.org DefinedTerm (JSON-LD)

json

{
  "@context": "https://schema.org",
  "@type": "DefinedTerm",
  "@id": "https://casrai.org/dictionary/term/data-hub",
  "name": "Data hub",
  "identifier": "https://casrai.org/dictionary/term/data-hub",
  "description": "A central node in a data ecosystem that aggregates, harmonises, and brokers access to data from multiple upstream sources, exposing the harmonised data to downstream consumers via curated APIs, query interfaces, or download endpoints.",
  "inDefinedTermSet": "https://casrai.org/dictionary/domain/data-infrastructure#set",
  "url": "https://casrai.org/dictionary/term/data-hub",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "publisher": {
    "@id": "https://casrai.org/#organization"
  },
  "author": {
    "@id": "https://casrai.org/#editorial-team"
  },
  "datePublished": "2026-05-21T02:18:11",
  "dateModified": "2026-09-05T14:23:21",
  "inLanguage": "en-GB",
  "isAccessibleForFree": true
}

Research-admin question? Get an answer that links its sources.

An AI assistant specialized in research administration. Every answer links its sources to check before you act. 2 questions free, no account. $29/month after.

Answers draw on CASRAI's guides and dictionary plus the federal and funder documents we index: Federal Register, Grants.gov, Regulations.gov and UKRI.

Every answer numbers its sources and links each one, so you can check the source yourself.

Ask about Data hub

Worked examples

Looks similar, but isn't