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Json – How to replace '"' with '\"' in javascript?

I have a variable str

let str = '{"id": "option2", "text": ""hello world""}';

when i try to convert to json using JSON.parse(str);, it throws an error SyntaxError: Expected ',' or '}' after property value in JSON at position 28. I’m aware that the javascript engine reads the str as

{"id": "option2", "text": ""hello world""}, so it’s expecting a , or a } after the first set of double quotes ("") that appear before hello world.

Putting an extra backslash allows JSON.parse(str); to run.

let str = '{"id": "option2", "text": "\"hello world\""}';

However, I’d like to put the extra backslash programatically. I’ve tried using the replace method. It doesn’t seem to have any effect

let str = '{"id": "option2", "text": ""hello world""}'.replace(/\"/g, '\\"');

JSON.parse(str) still throws the same error.

The result i’m looking for is such that when str.text is printed on the console, it’s value should be "hello world"

Tags:

2

Answers


  1. 0

    You need to use " if you want to KEEP the quotes

    let str = `{"id": "option2", "text": ""hello world""}`;
let obj = JSON.parse(str);
document.getElementById("output").innerHTML = obj.text
    <span id="output"></span>
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  2. 0

    the chalenge is that the beginning quoted words are differ from the end. And it seems like javascript has some bugs and doesn’t allow to replace "/" using replace function. So only this code works for me

    let sourceStr = '{"id": "option2", "text": ""hello world""}';
const searchStr = '""';

const indexes = [...sourceStr.matchAll(new RegExp(searchStr, "gi"))].map(
  (a) => a.index
);
console.log(indexes); // [26,39]

var sourceStrFixed = "";
var index;
for (index = 0; index < indexes.length; index += 2) {
  sourceStrFixed +=
    sourceStr.substring(0, indexes[index]) + '"\"'
    + sourceStr.substring(indexes[index] + 2, indexes[index + 1]) + '\""';
}
sourceStrFixed += sourceStr.substring(indexes[index - 1] + 2);
console.log(sourceStrFixed);
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