JSON minifier

main.ts

const base = `
{
    "a": 1,
    "b": {
        "c": 2,
        "d": "ai",
        "e": 2.3,
        "f": true,
        "g": null,
        "h": [
            1,
            {
                "i": 2,
                "j": [2,3,4]
                },
            "hello"
        ]
    }
}
`;


const strSplitRegex =  /(["])(.*?)\1/gm;

function parse(code: string): string {
    // e.g. ["{a:", ""hello!"", ",b:20"]
    const abstractTree: {
        objectLit: string,
        stringLit: string
    }[] = [];

    let splitedString: string = code;
    
    code.trim();
    code = code.replace(strSplitRegex, (match, ...p) => {
        abstractTree.push({
            objectLit: (splitedString.split(match).shift() ?? "").replace(/\n/gm, "").replace(/\s/gm, ""),
            stringLit: match
        });

        let splitedStringArray = splitedString.split(match);
        splitedStringArray.shift()
        splitedString = splitedStringArray.join(match).replace(match, "");

        return match;
    })



    const serializedCode = abstractTree.map(tree => {
        return tree.objectLit + tree.stringLit;
    }).join("") + splitedString.replace(/\n/gm, "").replace(/\s/gm, "");
    
    return serializedCode;
}

console.log(parse(base))