# Columbia University Libraries Hours API

**Canonical:** https://apis.io/apis/columbia/library-hours/  
**Provider:** Columbia University — https://apis.io/providers/columbia/  
**Base URL:** https://hours.library.columbia.edu/api/v1  
**Documentation:** https://hours.library.columbia.edu/

Columbia University Libraries Hours API is one of 10 APIs that [Columbia University](https://apis.io/providers/columbia/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. This API exposes 1 JSON Schema definition. Tagged areas include Campus Life, Library, Hours, Locations, and Open Data. The published artifact set on APIs.io includes an OpenAPI specification, authentication docs, a GitHub repository, and 1 JSON Schema.

The only institution-operated, publicly consumable, unauthenticated API found anywhere in Columbia University's estate. Two read operations: which library locations are open right now, and the posted hours for one location over a date or a date range. Returns JSON with Access-Control-Allow-Origin set to *, so it is directly callable from a browser or an agent with no key, no registration and no click-through. Columbia publishes no OpenAPI, no reference documentation and no changelog for it; the contract in this repository was reverse-engineered from live probes and from Columbia's own openly published application source. Small, undocumented, and genuinely theirs.

## Machine-readable artifacts (11)

- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/columbia/refs/heads/main/openapi/columbia-library-hours-openapi.yml
- **OpenAPI Source** — https://raw.githubusercontent.com/api-evangelist/columbia/refs/heads/main/openapi/_original/columbia-library-hours-openapi.yml
- **JSONSchema** — https://raw.githubusercontent.com/api-evangelist/columbia/refs/heads/main/json-schema/columbia-library-hours-schema.json
- **Examples** — https://raw.githubusercontent.com/api-evangelist/columbia/refs/heads/main/examples/index.yml
- **Errors** — https://raw.githubusercontent.com/api-evangelist/columbia/refs/heads/main/errors/columbia-errors.yml
- **Rules** — https://raw.githubusercontent.com/api-evangelist/columbia/refs/heads/main/rules/columbia-rules.yml
- **Vocabulary** — https://raw.githubusercontent.com/api-evangelist/columbia/refs/heads/main/vocabulary/columbia-vocabulary.yml
- **Authentication** — https://raw.githubusercontent.com/api-evangelist/columbia/refs/heads/main/authentication/columbia-authentication.yml
- **Lifecycle** — https://raw.githubusercontent.com/api-evangelist/columbia/refs/heads/main/lifecycle/columbia-lifecycle.yml
- **GitHubRepository** — https://github.com/cul/ldpd-hours
- **APIsJSON** — https://raw.githubusercontent.com/api-evangelist/columbia/refs/heads/main/apis.yml

## Other Columbia University APIs (9)

- [Columbia Identity — Shibboleth IdP and CAS](https://apis.io/apis/columbia/identity/)
- [CLIO Library Catalog Open Data](https://apis.io/apis/columbia/clio-opendata/)
- [Columbia Open Data Service](https://apis.io/apis/columbia/opendata/)
- [CU Directory of Classes](https://apis.io/apis/columbia/directory-of-classes/)
- [Columbia Academic Commons](https://apis.io/apis/columbia/academic-commons/)
- [Digital Library Collections and the 10.7916 DOI namespace](https://apis.io/apis/columbia/dlc/)
- [IRI/LDEO Climate Data Library](https://apis.io/apis/columbia/iri-data-library/)
- [CourseWorks (Instructure Canvas)](https://apis.io/apis/columbia/courseworks/)
- [Columbia University Data Platform (Redivis)](https://apis.io/apis/columbia/redivis/)

## Tags

Campus Life, Library, Hours, Locations, Open Data, JSON, CORS

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