pure js save text and json object to file

save.js

function saveTextToFile() {
    const saveText = "tmp";

    // file setting
    const text = saveText;
    const name = "sample.json";
    const type = "text/plain";

    // create file
    const a = document.createElement("a");
    const file = new Blob([text], { type: type });
    a.href = URL.createObjectURL(file);
    a.download = name;
    document.body.appendChild(a);
    a.click();
    a.remove();
}

function saveJsonObjToFile() {
    const saveObj = { "a": 3 }; // tmp

    // file setting
    const text = JSON.stringify(saveObj);
    const name = "sample.json";
    const type = "text/plain";

    // create file
    const a = document.createElement("a");
    const file = new Blob([text], { type: type });
    a.href = URL.createObjectURL(file);
    a.download = name;
    document.body.appendChild(a);
    a.click();
    a.remove();
}

Nice, this is very helpful !

Thanks, I have been looking for something like this for ages

Had a URL.createObjectURL is not a function error.
So prefixing it as: window.URL.createObjectURL(file); worked.