How do I add new field in existing JSON

Question

I have JSON with 10000 unique records and I need to add another field with a unique value to every record. How do I add that?

[
{
_id: "5fffd08e62575323d40fca6f",
wardName: "CIC",
region: "ABC",
location: "AAA",
specialism: "CSR",
__v: 0
},
.
.
.
]

The JSON is stored in variable showWard. How do I add an action field in my JSON with value = './wardName' where wardName is already a field in my JSON? This is my current code:

app.get('/wards', function (req, res) {
    Ward.find({}, function (err, showWard) {
        if (err) { console.log(err); return; }
        return res.send(showWard);
    });
});

That's an array of objects and not [JSON](https://www.json.org/json-en.html) -> [What is the difference between JSON and Object Literal Notation?](https://stackoverflow.com/questions/2904131/what-is-the-difference-between-json-and-object-literal-notation) — Andreas, Jan 19 '21 at 08:36

AlTheLazyMonkey · Answer 1 · 2021-01-19T09:07:39.010

0

Using a .map()? I don't know the logic for determinate the gender, but in Ward.find() callback you can add a thing like that:

app.get('/wards', function (req, res) {
    Ward.find({}, function (err, showWard) {
        if (err) { console.log(err); return; }

        const newShowWard = showWard.map(ward => {
            ward.gender = "BOH"; 
            return ward;
        })
        
        return res.send(newShowWard);
    });
});

edited Jan 19 '21 at 09:07

answered Jan 19 '21 at 08:35

AlTheLazyMonkey

1,190
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20

If you're not going to use the return value of `.map()` then you shouldn't use `.map()` – Andreas Jan 19 '21 at 08:46
Sorry, but what do you mean? If he assign the new object at a variable and use `res.send(variable)`, that's not goog? – AlTheLazyMonkey Jan 19 '21 at 09:01
Your example modifies `showWard` in-place, and you're not using the array returned by `.map()`. This should be a `.forEach()` call (without the `return ward;` at the end) – Andreas Jan 19 '21 at 09:03
Ah ok, right. Unfortunately I imply many things. – AlTheLazyMonkey Jan 19 '21 at 09:06

How do I add new field in existing JSON

1 Answers1