1function parseJSON(input) {
2
3    // if the input is empty or starts with an invalid character, throw an error
4    if (input === "" || input[0] === "'") {
5        throw Error();
6    }
7
8    // check if the input is null, an empty object, empty array, or a boolean and return the value from the input
9    if (input === "null") {
10        return null;
11    }
12    if (input === "{}") {
13        return {};
14    }
15    if (input === "[]") {
16        return [];
17    }
18    if (input === "true") {
19        return true;
20    }
21    if (input === "false") {
22        return false;
23    }
24
25    //if the input starts with a quote, return the value from inside the quotes
26    if (input[0] === '"') {
27        return input.slice(1, -1);
28    }
29
30    // if it starts with a bracket, perform parsing of the contents within the brackets
31    if (input[0] === "{") {
32        return input
33            .slice(1, -1)
34            .split(",")
35            .reduce((acc, item) => {
36                // get the key and the value of the JSON property by splitting the string on the colon character
37                const index = item.indexOf(":");
38                const key = item.slice(0, index);
39                const value = item.slice(index + 1);
40                acc[parseJSON(key)] = parseJSON(value);
41                return acc;
42            }, {});
43    }
44    // if the input is an array, return the value from inside the array
45    if (input[0] === "[") {
46        return input
47            .slice(1, -1)
48            .split(",")
49            .map((x) => parseJSON(x));
50    }
51}