A framework for building Open Graph images. GitHub’s new social preview images are generated by a Node.js script that fetches data from their GraphQL API, generates an HTML version of the card and then grabs a PNG snapshot of it using Puppeteer. It takes an average of 280ms to serve an image and generates around 2 million unique images a day. Interestingly, they found that bumping the available RAM from 512MB up to 513MB had a big effect on performance, because Chromium detects devices on 512MB or less and switches some processes from parallel to sequential.
Recent articles
- Claude can write complete Datasette plugins now - 8th October 2025
- Vibe engineering - 7th October 2025
- OpenAI DevDay 2025 live blog - 6th October 2025