Transforming a string representation of a nested array into an actual nested array with the help of JavaScript

My database stores a nested array as a string, which is then returned as a string when fetched. I am facing the challenge of converting this string back into a nested array. Despite attempting to use JSON.parse for this purpose, I encountered the following error:

VM5481:1 Uncaught SyntaxError: Unexpected token ' in JSON at position 2

In essence, my goal is to transform the following:

"[['E4', '4n.'], ['D4', '8n'], ['C4', '4n'], ['D4', '4n']]"

into this:

[['E4', '4n.'], ['D4', '8n'], ['C4', '4n'], ['D4', '4n']]

using JavaScript.

javascript

Answer №1

Working with JSON requires using double quotes " for string literals, not single quotes. You can update your code to use valid JSON strings by replacing single quotes with double quotes using the .replace() method:

const str = "[['E4', '4n.'], ['D4', '8n'], ['C4', '4n'], ['D4', '4n']]";
const res = JSON.parse(str.replace(/'/g, '"'));
console.log(res);

If possible, it's recommended to modify the source of the string rather than relying on the replace method.

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