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ESPN-Fantasy-Football-API
Connect to ESPN's fantasy football API via this JS API client for web and NodeJS. Available as an npm package.
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ESPN-API-Documentation
Some of the endpoints of ESPN's hidden NFL API, along with a (partial) list of player ids
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Doing a search (https://www.google.com/search?q=espn+fantasy+football+api), the first hit is: http://espn-fantasy-football-api.s3-website.us-east-2.amazonaws.com/ Is that what you're looking for?
Not for fantasy but this is some (unofficial) documentation for ESPN's APIs https://github.com/ianpherbert/ESPN-API-Documentation