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How could i go about checking wheather the input information is contained in the user.json file ?

How could i go about checking wheather the input information is contained in the user.json file ?

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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I have a "user.json" file that looks like this

{
    "something@somewhere.com": "maybe",
    "john@beatles.uk": "lennonj!",
    "paul@beatles.uk": "mccartney",
    "mick@rollingstones.uk": "jaggerm!"
}
 
using java script i have to parse this file and then check this email and file conbinations against user input
 
This is the code i m using to parse the file.
 
function lookUpCredentials(filePath, cb) {
    fs.readFile(filePath, (err, fileData) => {
        if (err) {
            return cb && cb(err);
        }
        try {
            const object = JSON.parse(fileData);
            return cb && cb(null, object);
        } catch (err) {
            return cb && cb(err);
        }
    });
}

lookUpCredentials("./user.json", (err, data) => {
    if (err) {
        console.log(err);
        return;
    }
    credentials = data;
});
 
and this is the code i m using to get input from the user
 
app.post('/login', (req, res) => {
    let username = req.body.username;
    let password = req.body.password;
})
 
How could i go about checking wheather the input information is contained in the user.json file ?
 
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