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----
-title: Create placeholder images with sharp Node.js image processing library
-url: create-placeholder-images-with-sharp.html
-date: 2020-03-27T12:00:00+02:00
-draft: false
----
-
-I have been searching for a solution to pre-generate some placeholder images for
-image server I needed to develop that resizes images on S3. I though this would
-be a 15min job and quickly found out how very mistaken I was.
-
-Even though Node.js is not really the best way to do this kind of things (surely
-something written in C or Rust or even Golang would be the correct way to do
-this but we didn't need the speed in our case) I found an excellent library
-[sharp - High performance Node.js image
-processing](https://github.com/lovell/sharp).
-
-Getting things running was a breeze.
-
-## Fetch image from S3 and save resized
-
-```js
-const sharp = require('sharp');
-const aws = require('aws-sdk');
-
-const x,y = 100;
-const s3 = new aws.S3({});
-
-aws.config.update({
-  secretAccessKey: 'secretAccessKey',
-  accessKeyId: 'accessKeyId',
-  region: 'region'
-});
-
-const originalImage = await s3.getObject({
-  Bucket: 'some-bucket-name',
-  Key: 'image.jpg',
-}).promise();
-
-const resizedImage = await sharp(originalImage.Body)
-  .resize(x, y)
-  .jpeg({ progressive: true })
-  .toBuffer();
-
-s3.putObject({
-  Bucket: 'some-bucket-name',
-  Key: `optimized/${x}x${y}/image.jpg`,
-  Body: resizedImage,
-  ContentType: 'image/jpeg',
-  ACL: 'public-read'
-}).promise();
-```
-
-All this code was wrapped inside a web service with some additional security 
-checks and defensive coding to detect if key is missing on S3.
-
-And at that point I needed to return placeholder images as a response in case
-key is missing or x,y are not allowed by the server etc. I could have created
-PNG in Gimp and just serve them but I wanted to respect aspect ratio and I
-didn't want to return some mangled images.
-
-> Main problem with finding a clean solution I could copy and paste and change a
-> bit was a task. API is changing constantly and there weren't clear examples or
-> I was unable to find them.
-
-## Generating placeholder images using SVG
-
-What I ended up was using SVG to generate text and created image with sharp and
-used composition to combine both layers. Response returned by this function is a
-buffer you can use to either upload to S3 or save to local file.
-
-```js
-const generatePlaceholderImageWithText = async (width, height, message) => {
-  const overlay = `<svg width="${width - 20}" height="${height - 20}">
-    <text x="50%" y="50%" font-family="sans-serif" font-size="16" text-anchor="middle">${message}</text>
-  </svg>`;
-
-  return await sharp({
-    create: {
-      width: width,
-      height: height,
-      channels: 4,
-      background: { r: 230, g: 230, b: 230, alpha: 1 }
-    }
-  })
-    .composite([{
-      input: Buffer.from(overlay),
-      gravity: 'center',
-    }])
-    .jpeg()
-    .toBuffer();
-}
-```
-
-That is about it. Nothing more to it. You can change the color of the image by
-changing `background` and if you want to change text styling you can adapt SVG
-to your needs.
-
-> Also be careful about the length of the text. This function positions text at
-> the center and adds `20px` padding on all sides. If text is longer than the
-> image it will get cut.