Transform a JSON object string into a usable value

Question

Transform a JSON object string into a usable value

I'm currently working on a function that takes a string, splits it, and then formats it using json[key][key2][key3]. The issue is that 'n' could potentially be infinite (not literally but needs to be written as such)

function getJsonValue(json,string) {
    var vals = string.split(".");
    var x = vals.length;
    var newString = '';
    while (x != 0) {
      newString += "['"+vals[(vals.length-x)]+"']"
        x--
    }
    return newString;
}

For example, this will produce:

"['condition']['item']['condition']['temp']"

I need to retrieve a value from that by combining it with a json object, like

json"['condition']['item']['condition']['temp']"

However, I am unsure if this is possible or how to achieve it.

Edit: The challenge I am facing is that I need any value from a config file to be passed in and then parsed by a returning function. For instance, a user knows the value will be condition.item.condition.temp for a specific query. I am attempting to create a single function that can handle all scenarios and pass in configuration values for the expected output. Therefore, in one query, the desired value might be condition.item.condition.temp and in another, it might be condition.wind.chill.

javascript

Answer 1

Answer №1

It seems there might be some confusion in understanding your task, but if you are dealing with a JavaScript object named json and a string formatted as field1.field2.field3, and your goal is to retrieve the value of json.field1.field2.field3, here's a possible solution:

function fetchValueFromJson(json, string) {
    var keys = string.split(".");
    for (var i = 0; i < keys.length; i++) json = json[keys[i]];
    return json;
}

You can apply this function on an object like this:

var data = { field1: { field2: { field3: "Hey there!" } } };
var result = fetchValueFromJson(data, "field1.field2.field3"); 
console.log(result); // outputs Hey there

Answer 2

It seems there might be some confusion in understanding your task, but if you are dealing with a JavaScript object named json and a string formatted as field1.field2.field3, and your goal is to retrieve the value of json.field1.field2.field3, here's a possible solution:

function fetchValueFromJson(json, string) {
    var keys = string.split(".");
    for (var i = 0; i < keys.length; i++) json = json[keys[i]];
    return json;
}

You can apply this function on an object like this:

var data = { field1: { field2: { field3: "Hey there!" } } };
var result = fetchValueFromJson(data, "field1.field2.field3"); 
console.log(result); // outputs Hey there

Answer 3

Answer №2

Check out the lodash documentation for using the get method.

_.get(data, 'property1.property2.property3')

By constructing the "path" in your code, you can utilize lodash to extract the desired value efficiently.

Answer 4

Check out the lodash documentation for using the get method.

_.get(data, 'property1.property2.property3')

By constructing the "path" in your code, you can utilize lodash to extract the desired value efficiently.

Answer 5

Answer №3

Have you considered using the eval function?

let data = {
    'first': {
        'second': {
            'third': {
                'fourth': 4
            }
        }
    }
};

alert(eval("data['first']['second']['third']['fourth']"))

Answer 6

Have you considered using the eval function?

let data = {
    'first': {
        'second': {
            'third': {
                'fourth': 4
            }
        }
    }
};

alert(eval("data['first']['second']['third']['fourth']"))

Transform a JSON object string into a usable value

Answer №1

Answer №2

Answer №3

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