How to read an external local JSON file in JavaScript?

Question

I have saved a JSON file in my local system and created a JavaScript file in order to read the JSON file and print data out. Here is the JSON file:

{"res         


        

Answer 1

I took Stano's excellent answer and wrapped it in a promise. This might be useful if you don't have an option like node or webpack to fall back on to load a json file from the file system:

// wrapped XMLHttpRequest in a promise
const readFileP = (file, options = {method:'get'}) => 
  new Promise((resolve, reject) => {
    let request = new XMLHttpRequest();
    request.onload = resolve;
    request.onerror = reject;
    request.overrideMimeType("application/json");
    request.open(options.method, file, true);
    request.onreadystatechange = () => {
        if (request.readyState === 4 && request.status === "200") {
            resolve(request.responseText);
        }
    };
    request.send(null);
});

You can call it like this:

readFileP('')
    .then(d => {
      ''
    });