convert an Array, converted to a String, back to an Array JavaScript Error

Question

I have this object :

let startCourseData = {
    'slidesHistory': '[{ id: 1, difficulty: 4, performance: 100, guided_phrases: [], sequence: "A", plan: false, planned: 10 },{ id: 2, difficulty: 4, performance: 30, guided_phrases: [], sequence: "A", plan: false, planned: 0 },{ id: 3, difficulty: 4, performance: 60, guided_phrases: [], sequence: "A", plan: false, planned: 6 },{ id: 4, difficulty: 4, performance: 80, guided_phrases: [], sequence: "B", plan: false, planned: 5 },{ id: 5, difficulty: 4, performance: 80, guided_phrases: [], sequence: "B", plan: false, planned: 6 },{ id: 6, difficulty: 4, performance: 82, guided_phrases: [], sequence: "A", plan: false, planned: 10 },{ id: 7, difficulty: 4, performance: 90, guided_phrases: [], sequence: "C", plan: false, planned: 9 },{ id: 8, difficulty: 4, performance: 90, guided_phrases: [], sequence: "C", plan: false, planned: 8 },{ id: 9, difficulty: 4, performance: 90, guided_phrases: [], sequence: "B", plan: false, planned: 5 },];'
};

And I want to convert slidesHistory that is a string to an array so I used JSON.parse like this:

const slidesHistorys = JSON.parse(startCourseData.slidesHistory);
console.log(slidesHistorys);

But I get an error!

Uncaught SyntaxError: Unexpected token i in JSON at position 3

How can I fix this?

your keys does not have double quotes, like "id: 1" or in short it is not ECMA-404 conform — Nina Scholz
– Nina Scholz, Commented Jun 17, 2020 at 15:13
You have invalid JSON. I'm not sure why you're storing it this way but I suggest fixing the encoding. — VLAZ
– VLAZ, Commented Jun 17, 2020 at 15:14
The key for the object in the array should have double quotes like this: [{ "id": 1, "difficulty": 4, ....}] — dRoyson
– dRoyson, Commented Jun 17, 2020 at 15:14
I want to store slidesHistory into a database as a string.. isn't it a good idea...?? — foxer
– foxer, Commented Jun 17, 2020 at 15:16

ebyte · Accepted Answer · 2020-06-17 15:15:45Z

you can use eval

let startCourseData = {
    'slidesHistory': '[{ id: 1, difficulty: 4, performance: 100, guided_phrases: [], sequence: "A", plan: false, planned: 10 },{ id: 2, difficulty: 4, performance: 30, guided_phrases: [], sequence: "A", plan: false, planned: 0 },{ id: 3, difficulty: 4, performance: 60, guided_phrases: [], sequence: "A", plan: false, planned: 6 },{ id: 4, difficulty: 4, performance: 80, guided_phrases: [], sequence: "B", plan: false, planned: 5 },{ id: 5, difficulty: 4, performance: 80, guided_phrases: [], sequence: "B", plan: false, planned: 6 },{ id: 6, difficulty: 4, performance: 82, guided_phrases: [], sequence: "A", plan: false, planned: 10 },{ id: 7, difficulty: 4, performance: 90, guided_phrases: [], sequence: "C", plan: false, planned: 9 },{ id: 8, difficulty: 4, performance: 90, guided_phrases: [], sequence: "C", plan: false, planned: 8 },{ id: 9, difficulty: 4, performance: 90, guided_phrases: [], sequence: "B", plan: false, planned: 5 },];'
};

const slidesHistorys = eval(startCourseData.slidesHistory);
console.log(slidesHistorys);

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