Exports Mapmyrun workouts to a series of tcx files which can be imported into lots of software.

Mapmyrun exporter.js

// # Javascript to copy in dev tools console
let data = await (await fetch("https://www.mapmyrun.com/internal/allWorkouts/?started_after=2020-01-29")).json()
// Change started_after for date you want to filter from or remove entirely for every workout
// Api parameters:
// number user= *id* - can be found in url of the person's profile ie https://www.mapmyrun.com/profile/[id]/activity_feed
// ISO-8601-date started_after= *date* for example this is valid 2020-01-29
// ISO-8601-date started_before= *date* this is another valid date 2011-10-05T14:48:00.000Z
// Remove ?user= to access only your own workouts
// Example url using all 3 parameters
// https://www.mapmyrun.com/internal/allWorkouts/?started_after=2020-01-29&started_before=2021-5-29&user=123456789

// To filter workouts by type
data = data.filter(x => x.name.includes('Road Cycling'))
// You can edit the line above, or remove it entirely if you want to keep every workout


let workoutUrls = JSON.stringify(data).match(/\/workout\/(\d*)\//g)
// At this point I reccomend the following steps
// 1 Tell your web browser to ask where the file should be saved
// 2 Create a folder for the files and save a single file
// 3 Tell web browser to automatically download files
// 4 After the sea of tabs open and close, reset web browser download preference setting to previous
for (let link of workoutUrls) {
    window.open(link.replace('/workout', '/workout/export') + 'tcx')
}