Convert string representation of an array to JSON

Question

I am trying to parse a String response from an API to JSON in ReactJS.

My string response looks like this:

[{"fromArea":"chocolate","toArea":"chocolate","distance":"100"},{"fromArea":"strawberry","toArea":"strawberry","distance":"200"},{"fromArea":"vanilla","toArea":"vanilla","distance":"300"}]

So far, I have tried:

JSON.parse(element.permission))

JSON.parse("\'"+element.permission+"\'")

I am getting error as:

AppliedPermissions.js:18 Uncaught (in promise) SyntaxError: Unexpected token o in JSON at position 1

Referred from:

Convert string array to array in javascript

Any help would be constructive.

Are you getting any errors? What is parse()returning if it isnt throwing errors? How are you retrieving the response? Is it maybe already parsed, as libraries like jQuery will do? Provide a minimal reproducible example that shows the problem — Patrick Evans
– Patrick Evans, Commented Nov 8, 2020 at 16:48
AppliedPermissions.js:18 Uncaught (in promise) SyntaxError: Unexpected token o in JSON at position 1 — VIVANK SHARMA 17BIT0325
– VIVANK SHARMA 17BIT0325, Commented Nov 8, 2020 at 16:49
What you have is JSON. See: What is the difference between JSON and Object Literal Notation?. You want to parse this into an object. If JSON.parse doesn't work for you, you should supply a minimal reproducible example because your code is correct. — VLAZ
– VLAZ, Commented Nov 8, 2020 at 16:50
If you're getting Unexpected token o in JSON at position 1 you most likely already have an object. Why do you think you need to parse it? — VLAZ
– VLAZ, Commented Nov 8, 2020 at 16:50
@VLAZ because when I am trying to loop through it. It's printing every character of that string. — VIVANK SHARMA 17BIT0325
– VIVANK SHARMA 17BIT0325, Commented Nov 8, 2020 at 17:01

Ismail Diari · Accepted Answer · 2020-11-08 16:54:47Z

0

AppliedPermissions.js:18 Uncaught (in promise) SyntaxError: Unexpected token o in JSON at position 1.

this means that what you are sending in JSON.parse() is already an object.
So what you say is a string representation is already an object and most likely is the JSON that you are trying to get, precisely is an array of json objects.

answered Nov 8, 2020 at 16:54

Ismail Diari

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k-wasilewski · Accepted Answer · 2020-11-08 17:05:54Z

-1

let json = {};
const paramRegex = /"[a-zA-Z0-9]":/;
const attrRegex = /:"[a-zA-Z0-9]"/;
const params = [];
const attrs = [];

while((param = paramRegex.exec(element.permission)) !== null) {
    params.push(param);
}

while((attr = attrRegex.exec(element.permission)) !== null) {
    attrs.push(attr);
}

let i = 0;
while (i < params.length && i < attrs.length) {
    json[params[i]] = attrs[i];
    i++;
}

answered Nov 8, 2020 at 17:05

k-wasilewski

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