Creating a hash from a string in Javascript

Question

Creating a hash from a string in Javascript

I'm struggling with the process of converting a string into a nested hash in JavaScript.

Here is the string I want to convert:

"{'btc_usd': {'price': 376.2, 'volume': 42812.69, 'change': -0.5},'btc_cny': {'price': 2519.39, 'volume': 67148.51, 'change': -85.13},'ltc_usd': {'price': 3.068, 'volume': 4735.55, 'change': -0.58},'btc_ltc': {'price': 0.00805433, 'volume': 153.33, 'change': -0.76},'btc_eth': {'price': 0.00660196, 'volume': 6428.98, 'change': 5.87}}"

I aim to enable hash['btc_usd']['price'] to return 376.2.

How can this be achieved?

Despite trying the following code, it doesn't execute as expected:

var string="{'btc_usd': {'price': 376.2, 'volume': 42812.69, 'change': -0.5},'btc_cny': {'price': 2519.39, 'volume': 67148.51, 'change': -85.13},'ltc_usd': {'price': 3.068, 'volume': 4735.55, 'change': -0.58},'btc_ltc': {'price': 0.00805433, 'volume': 153.33, 'change': -0.76},'btc_eth': {'price': 0.00660196, 'volume': 6428.98, 'change': 5.87}}"
var results=JSON.parse(string);

javascript json hash

Answer 1

Answer №1

Have you considered utilizing the JSON format directly?

let data = "{'btc_usd': {'price': 376.2, 'volume': 42812.69, 'change': -0.5},'btc_cny': {'price': 2519.39, 'volume': 67148.51, 'change': -85.13},'ltc_usd': {'price': 3.068, 'volume': 4735.55, 'change': -0.58},'btc_ltc': {'price': 0.00805433, 'volume': 153.33, 'change': -0.76},'btc_eth': {'price': 0.00660196, 'volume': 6428.98, 'change': 5.87}}";
data = "obj = " + data + ";";
eval(data);

console.log(obj.btc_usd.price);

This method is straightforward, but it does have its drawbacks: using eval() can pose security risks if the source of your string is unknown. Additionally, it may be resource-intensive, especially when processing a large number of entries in a loop.

Answer 2

Have you considered utilizing the JSON format directly?

let data = "{'btc_usd': {'price': 376.2, 'volume': 42812.69, 'change': -0.5},'btc_cny': {'price': 2519.39, 'volume': 67148.51, 'change': -85.13},'ltc_usd': {'price': 3.068, 'volume': 4735.55, 'change': -0.58},'btc_ltc': {'price': 0.00805433, 'volume': 153.33, 'change': -0.76},'btc_eth': {'price': 0.00660196, 'volume': 6428.98, 'change': 5.87}}";
data = "obj = " + data + ";";
eval(data);

console.log(obj.btc_usd.price);

This method is straightforward, but it does have its drawbacks: using eval() can pose security risks if the source of your string is unknown. Additionally, it may be resource-intensive, especially when processing a large number of entries in a loop.

Answer 3

Answer №2

The key difference between the provided string and valid JSON is the use of single quotes instead of double quotes. To rectify this, simply replace all occurrences of single quotes with double quotes and then proceed to parse the modified JSON.

str = str.replace(/'/g, "\"");
var result = JSON.parse(str);

It's important to note that this solution assumes there are no string literals containing single quotes within the JSON structure (e.g. {'name': 'John O\'hara'}).

Answer 4

The key difference between the provided string and valid JSON is the use of single quotes instead of double quotes. To rectify this, simply replace all occurrences of single quotes with double quotes and then proceed to parse the modified JSON.

str = str.replace(/'/g, "\"");
var result = JSON.parse(str);

It's important to note that this solution assumes there are no string literals containing single quotes within the JSON structure (e.g. {'name': 'John O\'hara'}).

Creating a hash from a string in Javascript

Answer №1

Answer №2

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