# Project Open Data (data.json) Catalog API

**Canonical:** https://apis.io/apis/data-gov/project-open-data/  
**Provider:** Data.gov — https://apis.io/providers/data-gov/  
**Documentation:** https://resources.data.gov/resources/dcat-us/

Project Open Data (data.json) Catalog API is one of 4 APIs that [Data.gov](https://apis.io/providers/data-gov/) publishes on the [APIs.io](https://apis.io/) network. This API exposes 1 JSON Schema definition. Tagged areas include Open Data, DCAT-US, Federal, and Catalog. The published artifact set on APIs.io includes API documentation and 1 JSON Schema.

Every U.S. federal executive branch agency is required by the Open Government Data Act of 2018 (and predecessor OMB M-13-13) to publish a public enterprise data inventory as a JSON document at /data.json on its primary domain. The format follows the DCAT-US 1.1 schema (Project Open Data Metadata Schema), an extension of W3C DCAT. Data.gov harvests these /data.json endpoints on a regular cadence and ingests records into the central CKAN catalog. The schema defines a Catalog containing Dataset records with required fields (title, description, keyword, modified, publisher, contactPoint, identifier, accessLevel, bureauCode, programCode) and optional distribution records (downloadURL, accessURL, mediaType, format).

## Machine-readable artifacts (3)

- **Documentation** — https://resources.data.gov/resources/dcat-us/
- **JSONSchema** — https://project-open-data.cio.gov/v1.1/schema/
- **SourceCode** — https://github.com/GSA/project-open-data-dashboard

## Other Data.gov APIs (3)

- [Data.gov CKAN Action API](https://apis.io/apis/data-gov/ckan-action-api/)
- [Data.gov Harvester (datagov-harvester)](https://apis.io/apis/data-gov/datajson-harvester/)
- [Inventory.data.gov CKAN API](https://apis.io/apis/data-gov/inventory-api/)

## Tags

Open Data, DCAT-US, Federal, Catalog

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/data-gov/project-open-data/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/data-gov/.