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web3 version 1.x has the decrypt method, which decrypts a keystore v3 JSON.

By using it the following way, I can get the private key easily:

web3.eth.accounts.decrypt(keystoreJsonV3, password);

But how to get the private key with web3 version 0.2.x ?

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Web3 v0.20.xx doesn't have such functionality. You can use a third party library like Ethereumjs Wallet.

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