node_mdw_2.js

// middleware/validateBodyParams.js

const validId = require('./validId');

module.exports = (req, res, next) => {
    const {
        account_id: accId,
        currency,
    } = req.body;

    if (!accId || !currency) {
        const err = new Error('missing body params');
        err.status = 412;
        return next(err);
    }

    if (!validId(accId)) {
        const err = new Error('invalid id');
        err.status = 400;
        return next(err);
    }

    next();
}