RRULE Parser

A web backend that accepts an iCal formatted recurrence rule and sends back a generated list of dates as JSON.

Why?

Created for an old back-end server unable to run the rrule.js javascript library directly.

Stack

• Node.js
• Express.js
• rrule.js

Hosting

The application is hosted on Heroku, and is publicly available.

How to use

You can either send requests to the publicly available Heroku service, or host the application on your own.

Request/Response example

HTML Request:

POST /parse HTTP/1.1
Host: rrule-parser.herokuapp.com
Content-Type: application/json

{
	"rrule": "INTERVAL=2;FREQ=MONTHLY;BYDAY=+2WE;COUNT=10;DTSTART=20171213"
}

Response:

{
    "dates": [
        "2017-12-13T00:00:00.000Z",
        "2018-02-14T00:00:00.000Z",
        "2018-04-10T23:00:00.000Z",
        "2018-06-12T23:00:00.000Z",
        "2018-08-07T23:00:00.000Z",
        "2018-10-09T23:00:00.000Z",
        "2018-12-12T00:00:00.000Z",
        "2019-02-13T00:00:00.000Z",
        "2019-04-09T23:00:00.000Z",
        "2019-06-11T23:00:00.000Z"
    ],
    "friendlyText": "every 2 months on the 2nd Wednesday for 10 times"
}