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koa-rerender is perfect for Single Page Application SEO.
koa-rerender is a service that uses Chrome headless to create static HTML out of a javascript page.
npm install --save koa-rerender
You can import from koa-rerender:
import { isCrawler, launch } from 'koa-rerender';
if (isCrawler(ctx.request)) {
const reRender = await launch()
const html = await reRender.render({ url: 'https://reactjs.org/docs/portals.html' })
}