Church Calendar API
Overview
Church Calendar (calapi.inadiutorium.cz) is a free, no-auth REST API that returns the Roman Catholic liturgical calendar for any date or month. It provides the liturgical season, feast day names, and liturgical colour for each day. No registration is needed — just send a GET request with a year, month, and optional day.
Beginner Tip
No API key or sign-up required, making this one of the easiest APIs to test. Request a full month with GET http://calapi.inadiutorium.cz/api/v0/en/calendars/default/YYYY/MM.
Available Data
Example Response
{
"status": "success",
"data": {
"result": "Data from Church Calendar",
"description": "Catholic liturgical calendar",
"timestamp": "2025-01-15T10:00:00Z"
}
} Field Reference
[].date The calendar date in YYYY-MM-DD format. [].season The liturgical season for that day, e.g., "advent" or "ordinary". [].celebrations[].name Name of the feast or memorial observed on that day. [].celebrations[].colour Liturgical colour for the celebration: "white", "red", "green", or "purple". [].celebrations[].rank Liturgical rank of the celebration, e.g., "solemnity", "feast", or "memorial". Implementation Example
const url = "http://calapi.inadiutorium.cz/";
const response = await fetch(url);
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data); What Can You Build?
Note: These code examples are AI-generated and unverified. Always refer to the official API documentation for accurate usage.
Common Errors & Troubleshooting
Matrix Score Breakdown
Fully tested on Apr 5, 2026
Technical Specifications
Related Tags
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