String to array, format

Question

I passing some params from by back to my front through environment params. No problems with strings but I'm getting crazy to do it with an array.

Initial array format = ["one", "two", "three"]
when I pass it to the front, it return "["one", "two", "three"]"
So to solve thats, a little js tricks (.replace(/"/g, "'")) give me that format : "['one', 'two', 'three']"

And now, I would like to transform it to a basic array javascript like this : ['one', 'two', 'three']

Any ideas to solve that (with less code would be great obviously !)

You cant use arrays for that: environment variables are strings. allways! What you can do is to "serialize" the array on the backend with <ENV_VAR> = JSON.serialize(...) and "parse" it with JSON.parse(<ENV_VAR>) on the frontend. — Marc
– Marc, Commented Oct 21, 2020 at 13:34
You can refer to this answer here: stackoverflow.com/questions/9244824/… Seems like the same issue — RohitG
– RohitG, Commented Oct 21, 2020 at 13:36

Tibebes. M · Accepted Answer · 2020-10-21 13:54:02Z

2

You can replace """ and then split by ",".

let str = "[&quot;one&quot;, &quot;two&quot;, &quot;three&quot;]"
let ret = str.slice(1, -1).replace(/&quot;/g, "").split(",").map(x => x.trim());
console.log(ret);

edited Oct 21, 2020 at 13:54

Tibebes. M

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answered Oct 21, 2020 at 13:39

phi-rakib

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Tibebes. M · Accepted Answer · 2020-10-21 13:55:29Z

2

First, unescape the HTML code by passing it through a temporary text area. Second, use JSON.parse() to convert the unescaped String to a JavaScript array.

escaped = "[&quot;one&quot;, &quot;two&quot;, &quot;three&quot;]"

const tmp = document.createElement("textarea");
tmp.innerHTML = escaped;
unescaped = tmp.value;
array = JSON.parse(unescaped);
document.write(array); // "one,two,three"

edited Oct 21, 2020 at 13:55

Tibebes. M

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answered Oct 21, 2020 at 13:43

Konrad Höffner

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Derek Wang · Accepted Answer · 2020-10-21 13:36:15Z

1

You can use Javascript eval() function to extract that string into array as follows.

const input = "['one', 'two', 'three']";

console.log(eval(input));

answered Oct 21, 2020 at 13:36

Derek Wang

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1 Comment

Marc Over a year ago

You should avoid using eval, especially if you can simply enter ENV_VAR = "<script> alert () </script>" from outside

Ayush v · Accepted Answer · 2020-10-21 13:42:50Z

0

send data as string from server to client as string

var x = ["one", "two", "three"];
let dataForExchange = x.tostring();

Now when data received at the client parse it into an array again

var xArray = dataForExchange.split(',');

answered Oct 21, 2020 at 13:42

Ayush v

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