Check if image exists on server using JavaScript?


Using javascript is there a way to tell if a resource is available on the server? For instance I have images 1.jpg - 5.jpg loaded into the html page. I'd like to call a JavaScript function every minute or so that would roughly do the following scratch code...

if "../imgs/6.jpg" exists:
    var nImg = document.createElement("img6");
    nImg.src = "../imgs/6.jpg";

Thoughts? Thanks!

You could use something like:

function imageExists(image_url){

    var http = new XMLHttpRequest();

    http.open('HEAD', image_url, false);
    http.send();

    return http.status != 404;

}

Obviously you could use jQuery/similar to perform your HTTP request.

$.get(image_url)
    .done(function() { 
        // Do something now you know the image exists.

    }).fail(function() { 
        // Image doesn't exist - do something else.

    })

You can use the basic way image preloaders work to test if an image exists.

function checkImage(imageSrc, good, bad) {
    var img = new Image();
    img.onload = good; 
    img.onerror = bad;
    img.src = imageSrc;
}

checkImage("foo.gif", function(){ alert("good"); }, function(){ alert("bad"); } );

JSFiddle


You can just check if the image loads or not by using the built in events that is provided for all images.

The onload and onerror events will tell you if the image loaded successfully or if an error occured :

var image = new Image();

image.onload = function() {
    // image exists and is loaded
    document.body.appendChild(image);
}
image.onerror = function() {
    // image did not load

    var err = new Image();
    err.src = '/error.png';

    document.body.appendChild(err);
}

image.src = "../imgs/6.jpg";

If anyone comes to this page looking to do this in a React-based client, you can do something like the below, which was an answer original provided by Sophia Alpert of the React team here

getInitialState: function(event) {
    return {image: "http://example.com/primary_image.jpg"};
},
handleError: function(event) {
    this.setState({image: "http://example.com/failover_image.jpg"});
},
render: function() {
    return (
        <img onError={this.handleError} src={src} />;
    );
}

If you create an image tag and add it to the DOM, either its onload or onerror event should fire. If onerror fires, the image doesn't exist on the server.


You may call this JS function to check if file exists on the Server:

function doesFileExist(urlToFile)
{
    var xhr = new XMLHttpRequest();
    xhr.open('HEAD', urlToFile, false);
    xhr.send();

    if (xhr.status == "404") {
        console.log("File doesn't exist");
        return false;
    } else {
        console.log("File exists");
        return true;
    }
}

A better and modern approach is to use ES6 Fetch API to check if an image exists or not:

fetch('https://via.placeholder.com/150', { method: 'HEAD' })
    .then(res => {
        if (res.ok) {
            console.log('Image exists.');
        } else {
            console.log('Image does not exist.');
        }
    }).catch(err => console.log('Error:', err));

Make sure you are either making the same-origin requests or CORS is enabled on the server.


Basicaly a promisified version of @espascarello and @adeneo answers, with a fallback parameter:

const getImageOrFallback = (path, fallback) => {
  return new Promise(resolve => {
    const img = new Image();
    img.src = path;
    img.onload = () => resolve(path);
    img.onerror = () => resolve(fallback);
  });
};

// Usage:

const link = getImageOrFallback(
  'https://www.fillmurray.com/640/360',
  'https://via.placeholder.com/150'
  ).then(result => console.log(result) || result)

// It can be also implemented using the async / await API.

Note: I may personally like the fetch solution more, but it has a drawback – if your server is configured in a specific way, it can return 200 / 304, even if your file doesn't exist. This, on the other hand, will do the job.


You can do this with your axios by setting relative path to the corresponding images folder. I have done this for getting a json file. You can try the same method for an image file, you may refer these examples

If you have already set an axios instance with baseurl as a server in different domain, you will have to use the full path of the static file server where you deploy the web application.

  axios.get('http://localhost:3000/assets/samplepic.png').then((response) => {
            console.log(response)
        }).catch((error) => {
            console.log(error)
        })

If the image is found the response will be 200 and if not, it will be 404.

Also, if the image file is present in assets folder inside src, you can do a require, get the path and do the above call with that path.

var SampleImagePath = require('./assets/samplepic.png');
axios.get(SampleImagePath).then(...)

This works fine:

function checkImage(imageSrc) {
    var img = new Image();        
    try {
        img.src = imageSrc;
        return true;
    } catch(err) {
        return false;
    }    
}

You can refer this link for check if a image file exists with JavaScript.

checkImageExist.js:

    var image = new Image();
    var url_image = './ImageFolder/' + variable + '.jpg';
    image.src = url_image;
    if (image.width == 0) {
       return `<img src='./ImageFolder/defaultImage.jpg'>`;
    } else {
       return `<img src='./ImageFolder/`+variable+`.jpg'`;
    } } ```