stringify javascript values with support for Symbols that will be rendered as is

stringify.js

function stringify(data, indentation = 2) {
    if (typeof indentation === "number") {
        return doStringify(data, 0, " ".repeat(indentation))
    }

    return doStringify(data, 0, indentation)
}


function doStringify(data, level = 0, idt = "  ") {
    if (typeof data === "symbol") {
        return data.description;
    }

    if (Array.isArray(data)) {
        return "[" + "\n"
            + data.map(val => idt.repeat(level + 1) + doStringify(val, level + 1, idt) + ",").join('\n')
            + "\n" + idt.repeat(level) + "]"
    }

    if (data && typeof data === 'object') {
        return "{" + "\n"
            + Object.entries(data)
                .map(([key, val]) => idt.repeat(level + 1) + JSON.stringify(key) + ": " + doStringify(val, level + 1, idt) + ",")
                .join("\n")
            + "\n" + idt.repeat(level) + "}"
    }

    return JSON.stringify(data);
}
console.log(stringify([1, "string", true, {
    a: "b"
}]))

console.log(stringify({
    "null": null,
    "infinity": Infinity,
    "date": Date.now(),
    banana: "bread",
    "foo": "bar",
    "number": 1,
    "truth": false,
    "array": [1, "string", true, {
        a: "b"
    }],
    "object": {
        "a": "b",
        sym: Symbol("__dirname"),
        func: Symbol("JSON.stringify(1)")
    }
}));

Output

[
  1,
  "string",
  true,
  {
    "a": "b",
  },
]

{
  "null": null,
  "infinity": null,
  "date": 1675682915616,
  "banana": "bread",
  "foo": "bar",
  "number": 1,
  "truth": false,
  "array": [
    1,
    "string",
    true,
    {
      "a": "b",
    },
  ],
  "object": {
    "a": "b",
    "sym": __dirname,
    "func": JSON.stringify(1),
  },
}