Game contracts are written on Solidity. On what frameworks are sites like Cryptokitties and other games made? (Node js, React, Vue or something else?)

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The JavaScript library Web3.js has been developed specifically for Ethereum dapps. I don't think there's any competing JS frameworks for Ethereum at this time. Web3.js can be used in conjunction with a variety of JavaScript frameworks including the ones that you've mentioned, but Web3.js is the crucial JS library for connecting to Ethereum.

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    Also on the server side you can use web3.py github.com/ethereum/web3.py and other Web3 frameworks for your choice of programming language. May 5, 2018 at 9:02
  • ^ Good point. I've also seen people using web3j for Java and Android apps. May 6, 2018 at 0:15

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