How can a convert an image into a url?

Question

I am creating a web app, in which I receive a image file from the user then have to store it in my Firebase Realtime Database and display it in Html. Since Realtime Database doesn't support files I have to create a Url for my image.

The Url I want is not a download link like this which I got from the Firebase Cloud Storage Url creation tool, rather I need a viewable link like this which I can add to the src on my tag in Html like this:

<img src="The Url">

I have tried using Firebase Cloud Storage, but when uploading and image file, the image is uploaded as an Application/octate-stream rather than an image. When I run the geturl() function it gives me this link which leads to a download page and therefore I cannot it to the src attribute of tag.

The file uploading code is this:

var file_from_usr = document.getElementById('file_input')
var storageRef = firebase.storage().ref();
var thisRef = storageRef.child(filename);
thisRef.put(file_from_usr).then((snapshot) => {
    console.log('Uploaded a blob or file!');
});

convert your image binary data into base64 string

Rahul Kumar
– Rahul Kumar

2021-05-05 04:54:55 +00:00
Commented May 5, 2021 at 4:54 — Rahul Kumar
– Rahul Kumar, Commented May 5, 2021 at 4:54
how can I do it?

SunSom
– SunSom

2021-05-05 04:58:21 +00:00
Commented May 5, 2021 at 4:58 — SunSom
– SunSom, Commented May 5, 2021 at 4:58

Nirmal Dey · Accepted Answer · 2021-05-05 05:05:42Z

0

This seems like a metadata issue to me. Your code is not able to infer the file's type, so by default, it will assume it to be an Application/octet-stream content type.

if for some reason your filename has no extension or some other problems then you can manually specify that content-type metadata.

var metadata = {
  contentType: 'image/jpeg',
};

// Upload the file and metadata
var uploadTask = storageRef.child('images/mountains.jpg').put(file, metadata);

https://firebase.google.com/docs/storage/web/upload-files

Alternatively, try putting an extension to your filename . eg. filename= "myimage.jpg"

answered May 5, 2021 at 5:05

Nirmal Dey

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2 Comments

SunSom Over a year ago

Using this the file gets uploaded as an image but then I think it gets corrupted. This is the link I get

Nirmal Dey Over a year ago

Try uploading a different image. Also , Converting your image to base64 encoding (text formatis not an efficient way to upload files.

Rahul Kumar · Accepted Answer · 2021-05-05 06:00:01Z

0

download image data using fetch api and convert it into url which you can set to image src attribute; Added the code snippet for the same below. This code is to download image and skipped the upload task which seems like working as mentioned in above post.

getImageURL(url) {
  const options = {
    method: 'GET',
    mode: 'no-cors',
    cache: 'default'
  };
  return fetch(url, options).then((response) => {
    return response.blob();
  }).then(blob => {
    return URL.createObjectURL(blob);
  });
}

document.getElementById("myImg").src = getImageURL("https://{your_url_path}");

edited May 5, 2021 at 6:00

answered May 5, 2021 at 5:18

Rahul Kumar

3,1572 gold badges18 silver badges23 bronze badges

9 Comments

SunSom Over a year ago

Sorry I am not able to understand what are you trying to say. I am a new to Javascript. How can I download image data using fetch api and convert it into a url?

Rahul Kumar Over a year ago

you need to call getImageURL() method by passing the url, and it will get the response as blob and will convert to url.

SunSom Over a year ago

Oh ok. Now I get it. I will try and respond

SunSom Over a year ago

This is giving me this error: Access to fetch at 'firebasestorage.googleapis.com/v0/b/…' from origin '127.0.0.1:5500' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.

Rahul Kumar Over a year ago

you need to disable cors to make it work from your local machine

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