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I am trying to call the ethers js functions which in turn call my smart contract using an express API. I created the APIs but I'm unable to run the server and get the response for the API request.

I started the local hardhat env with npx hardhat node. Butt eventually want to run the APIs on the smart contract deployed on the Polygon-Mumbai testnet.

When I run the express app using command node app.js I'm not able to connect with deployed smart contract in hardhat local env. And When I run it using npx hardhat run app.js --network localhost I am able to call the API along with the smart contract using postman, but the response doesn't go back to postman and it keeps waiting.

Do I need to leverage the config in hardhat.config.js file to start the server?

Any help is much appreciated. Thanks in advance!

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