Josh Grant
Military to Cloud Architect

Military to Cloud Architect

Reverse Engineering Crossfit Games API

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Reverse Engineering Crossfit Games API

Josh Grant's photo
Josh Grant
·Feb 27, 2022·

3 min read

I am "competing" in the CrossFit Open this year. I have only been doing CrossFit for about 5 months and signed up for the open as a personal challenge and to see where I stack up against others in my age group.

It is 0500 in the morning and I want to see where I am at on the leaderboard. I log in to the CrossFit Games website to check. I can search for my name and see what place I am in, but the experience is odd and some information is missing.

As I navigate the leaderboard I notice the website is not reloading, it must be pulling this data from an API. Let's reverse engineer the API and get the data we want.

Finding the API

I start by launching the Developer Tools built into the Chrome Browser and going to the Network tab. If you are following along this is the leaderboard URL:

Just looking at the URL we can see some parameters we might be interested in: division, region, and scaled.

Loading the Leaderboard sends a lot of requests, to find the request to the API lets Filter and show Fetch/XHR requests.

Screen Shot 2022-02-27 at 5.25.45 AM.png

The page is making 9 requests, one of them to the following URL:

We found the API.

The Basics

In the CrossFit Open, there are three main categories you can compete in.

  • RX: You do the hardest version of the workout
  • Scaled: You do a slightly easier version of the workout
  • Foundations: You do the easiest version of the workout

Going back to Chrome I watch for outgoing requests to the API while changing the Workout Type Filter on the website. From that I determine how to use the scaled parameter on the API.

  • RX: scaled=0
  • Scaled: scaled=1
  • Foundations: scaled=2

In a similar way I map out some of the division parameter options:

  • Men: division=1
  • Women division=2
  • Men (35-39) division=18

The website allows me to search by Athlete Name, let's see how that works. As I type my name in the search box it begins autocompleting with the closest matching athlete name. I find the following request is sent as I am typing.

When I click on my autocompleted name the page makes the following request:

The results of that request contains all the information I was looking for. I can see the total number of competitors based on the parameters of my request.

"version": 3,
"dataType": "LEADERBOARD",
"query": "query-string",
"sort": 0,
"pagination": {
"totalPages": 43,
"totalCompetitors": 2140,
"currentPage": 15

I can see that I am currently 729 out of 2140 for Males 35-40 that completed the scaled workout.

"overallRank": "729",
"overallScore": "12732",
"nextStage": "",
"ui": {
"highlight": true,
"countryChampion": false
"entrant": {
"competitorId": "2166965",
"competitorName": "Joshua Grant",
"firstName": "Joshua",
"lastName": "Grant",
"status": "ACT",
"postCompStatus": "",
"gender": "M",
"profilePicS3key": "20a29-P2166965_1-184.jpg",
"countryOfOriginCode": "US",
"countryOfOriginName": "United States",
"countryShortCode": "",
"regionId": "31",
"regionName": "North America",
"divisionId": "18",
"affiliateId": "27760",
"affiliateName": "CrossFit CG2RK",
"age": "36",
"height": "",
"weight": "",
"teamCaptain": "0"

There is a lot more data to explore. I might write another post about using Postman to explore and document this API.

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