Is Solidity a backend language?

You can have separate repositories for your Solidity backend and JavaScript frontend . For the backend you would use Truffle and for the frontend you would start with create-eth-app. You can have both parts in one repository for convenience and for example start with the Truffle React box.

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Do I need Python for Solidity?

However, unless you want to interact with the smart contract with command line or online tools like Remix Solidity , you will need another language to interact with the smart contract . The second language can be Python or Javascript or any other language which already has some interaction libraries with Solidity.

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