Masking middle 4 digit number using Javascript

Question

I have Json Array data as shown below:

{
    "AccountNumber":[
        "123456789012",
        "234567891012",
        "345678912012"
    ]
}

Now I want to mask the middle 4 digit number only. as shown below:

{
    "AccountNumber":[
        "1234xxxx9012",
        "2345xxxx1012",
        "3456xxxx2012"
    ]
}

Can anyone help how to mask multiple json array data using javascript.

Answer 1

Since you say your working with JSON, the answer is as follows:

var json = '{"AccountNumber":["123456789012","234567891012","345678912012"]}';
var result = json.replace(/(\d{4})(\d{4})(\d+)/g, '$1xxxx$3');

// this will be the JSON with the masked values
console.log(result);
// now you can parse the JSON and get some useful result
console.log(JSON.parse(result));

However, it may be more useful to work with data parsed from JSON

var json = '{"AccountNumber":["123456789012","234567891012","345678912012"]}';
var data = JSON.parse(json);
data.AccountNumber.forEach((v, i, a) => a[i] = `${v.substr(0, 4)}xxxx${v.substr(8)}` );
console.log(data);