Chartjs-How do I run Chart.js with Angular 10 SSR / universal?

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The reason why this is happening is because you are running SSR with NodeJS and there is no window object, so you need a NodeJS replacement.

I suggest installing domino

npm i --save-dev domino

Then in your server.ts

const domino = require('domino');

const template = fs
  .readFileSync(path.join('dist/browser', 'index.html')) // Or whereever your rendered index.html is
  .toString();


const window = domino.createWindow(template);
(global as any).window = window;
(global as any).document = window.document;

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