CU-REG Course Schedule API
The read-only JSON backend behind CU-REG Course Schedule, the Office of the Registrar's public course, curriculum and timetable browser. Two endpoints answer HTTP 200 to an unauthenticated request from outside the campus network — /course-studies, which returns the curriculum register with degree and major names in Thai and English, credit totals and offering windows, and /version. The Angular client declares thirteen further endpoints against the same base (/course, /course-detail, /faculty, /instructor, /exam-date and others); all thirteen returned 404 on probe, and they are recorded as observations in the OpenAPI rather than promoted to a contract that cannot be demonstrated. No key, no token, no published rate limit, no terms of use. A bare GET on the base /class/api issues a 301 to http://cas.reg.chula.ac.th:8080/class/api/, leaking the origin port and downgrading to plain HTTP.
CU-REG Course Schedule API is one of 10 APIs that Chulalongkorn University publishes on the APIs.io network, described by a machine-readable OpenAPI specification.
This API exposes 1 JSON Schema definition.
Tagged areas include Course Catalog, Curriculum, Registrar, Student Systems, and Education. The published artifact set on APIs.io includes an OpenAPI specification and 1 JSON Schema.
This API exposes 2 operations across 2 paths, organized into 2 resource areas, and defines 1 schema. It is described by OpenAPI 3.0.3, at version 2026.8.21-1644-1a51328.
Requests are made against a single base URL, https://cas.reg.chula.ac.th/class/api.
Metadata
The identity and technical contract details declared by the specification.
Paths & Operations 2
Across 2 paths, the API surfaces 2 operations — 2 GET. They span 2 resource areas: Meta, Curriculum. Each is listed below with its method, path, parameters, and response codes.
Service metadata
Degree programs and fields of study
Schemas 1
The contract defines 1 schema that model the data the API accepts and returns. The most detailed is CourseStudy (34 properties). Each schema is shown below with its type and property counts.
Specification
The full machine-readable OpenAPI contract behind this narrative.
Source
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Other APIs Chulalongkorn University publishes across the network.
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