How to read specific object from json file in JavaScript?

Question

I'm trying to work with a json file but I can't figure out how to read just a specific object from a json file.

My current code looks like this:

try {
    const data = fs.readFileSync("addresses.json", "utf8");
    console.log(data);
} catch (err) {
    console.error(err);
}

This works fine. However when I try to get some object from the file like this:

console.log(data.address)

It doesn't work because it is a string.

So my question is how can I read just a single object from the json file.

Thanks a lot!

You need to parse the string that you get first using JSON.parse(). Then you will be able to access it the way you want to. — Mushroomator
– Mushroomator, Commented Mar 26, 2022 at 19:42

Steven Spungin · Accepted Answer · 2022-03-26 19:41:54Z

3

Try:

const parsedData = JSON.parse(data)
const address = parsedData.address

answered Mar 26, 2022 at 19:41

Steven Spungin

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Comments

Viradex · Accepted Answer · 2022-03-26 19:45:30Z

2

You need to use JSON.parse(), as right now, you are trying to access a property off of a string. However, the method will change it to an object.

// Dummy JSON data
const data = `{ "address": "Stack Overflow" }`;

const json = JSON.parse(data);
console.log(json.address);

This will make it possible to access the properties off of the object.

answered Mar 26, 2022 at 19:45

Viradex

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Comments

mathhacker · Accepted Answer · 2022-03-26 20:01:32Z

0

you must convert the data into json like so:

    JSON.parse(data)

In your example :

    try {
        const data = fs.readFileSync("addresses.json", "utf8");
        console.log(JSON.parse(data).address);
    } catch (err) {
        console.error(err);
    }

I hope I answered your question. Feel free to comment if I misunderstood you or you have some questions ;)

answered Mar 26, 2022 at 20:01

mathhacker

1

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