postEth.js

exports.postData = async (req, res, next) => {
    try {
        const { hash } = req.data[0];
        const accounts = await web3.eth.getAccounts();

        const resp = await SavingContract.methods.saveHash(hash)
            .send({
                from: accounts[0],
            });
        const data = Object.assign({ ipfsHash: hash }, resp);
        req.data = data;
        next();
    } catch (err) {
        res.status(500).send(err.message);
    }
};