Convert buffer data to an image

Question

how do i convert this buffer data to an image so when am looping thru the result and rendering it in the img src it will render as an image that the user can see

am using ejs to render it

     <span>
        <img class="user-with-avatar" src=<%=item.photo%> />
     </span>

when i console.log(result.data.photo), i get this

{"type":"Buffer","data":[100,97,116,97,58,14,79,8,113,97,65,43,57,55,89,69,88,51,66,101,70,86,112,121,112,121,121,121,80,81,104]},
{"type":"Buffer","data":[100,97,116,97,58,14,79,8,113,97,65,43,57,55,89,69,88,51,66,101,70,86,112,121,112,121,121,121,80,81,104]},
{"type":"Buffer","data":[100,97,116,97,58,14,79,8,113,97,65,43,57,55,89,69,88,51,66,101,70,86,112,121,112,121,121,121,80,81,104]}

how do i fix it with this code arrangement

    app.get('/products', function (req, res) {
            if (req.session.token && req.session.user_id) {
                let data = {
                    token: req.session.token,
                    id: req.session.user_id,
                }
                let url = `https:/url/product/get_products?id=${data.id}&token=${data.token}`
                functions.callAPIGet(
                    url,
                    function (error, result) {
                        res.render('products', {
                            result: result.data
                        })
                    }
                );
            } else {
                res.redirect('/login')
            }
        });

Padriac

It sounds like you want a data URI that you can embed in your page. See #53274052 for one implementation. – Disseminule

Answer 1

You'll need to convert the buffer to a base64 string. Here's an example for a PNG image. I am not clear on where your image is stored and format it's in however. This example reads the image as a file. May need to adjust things based on your data source.

server.js

const express = require('express')
const app = express()
const fs = require('fs')
app.set('view engine', 'ejs')

app.get('/', function(req, res) {
  const data = fs.readFileSync('./image.png')

  res.render('page', {
    image: data.toString('base64')
  })
})

const server = app.listen(2000)

views/page.ejs

<img src="data:image/png;base64,<%= image %>" />

Lettered

I think the OP is trying to create a data URL that they embed in their page (where the image data is in the URL), not respond to a browser request for an image. – Disseminule

Ah I see. @CodeBae - can you clarify how this image is stored and how it's fetched? I adjusted example to read image as a file but I suspect your use case is a bit different. – Lettered

Answer 2

this is an examples of how you can do it using the express.js

const express = require("express");
const app = express();
    
app.get("/images/:id", async (req, res) => {
  const id = req.params.id;
  const image = await Product.findOne({ _id: id }).select("images");
  res.contentType(image.contentType);
  res.send(image.data);
});
    
app.listen(3000, () => {
  console.log("Image server started on port 3000");
});

And here's how you can display the images in HTML:

<img src="http://localhost:3000/images/<id-of-the-image>" />

Crafton