Behind the scenes, Web3 uses JSON RPC . RPC is used in many different types of programming languages. You can learn more about JSON RPC here.
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Blockchain developers use javascript in web3. js and ethereum. js which it helps you connect your frontend of application to connect with ethereum network and smart contracts. Another popular use of javascript in blockchain is Hyperledger Fabric SDK for node.
Read moreWhat is the best blockchain framework?
Top 6 blockchain development frameworks
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