Generates open graph images for your blog with Github Actions.

This github action scans your PR for changes to md or mdx files, reads frontmatter configuration from them and generates images for your SEO.

If looks very bland without an image when you share the URL, but adding a cover pic with nothing do with your article also does not suit you well. Here is a Github Action based generator that got you covered.

In your action file:

name: "Generate OG Images"
on: pull_request

jobs:
  generate_og_job:
    runs-on: ubuntu-latest
    name: Generate OG Images
    steps:
      - name: Checkout
        uses: actions/checkout@v1
      - name: Generate Image
        uses: BoyWithSilverWings/generate-og-image@1.0.0@beta
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          GITHUB_CONTEXT: ${{ toJson(github) }}
        with:
          path: src/images/post-images/

For configuring the parameters, add following fields to the frontmatter:

---
ogImage:
  title: "Things you don't know"
  subtitle: "There must be something"
  imageUrl: "https://example.com/image-url.jpg"
  background: "yellow"
  fontColor: "rgb(0, 0, 0)"
  fontSize: "100%"
---

Works only with Pull Requests and md and mdx files.

These are props that you can configure in the action file to customise the working.

Frontmatter level props on a document always takes precedence over Repository level props.

1. I need a gradient background

   Just as in CSS your frontmatter or Repo level prop can contain:

   background: 'linear-gradient(to right, #ec008c, #fc6767)'
   

2. What if I need an image as background?

   Write the CSS for it.

   background: 'url(https://example.com/image.png)'
   

3. What about font sizes?

   you can customise the repository level or frontmatter fontSize props which defaults to 100%. The heading and paragraph font sizes vary depending on it.

   fontSize: 120%;
   

4. I need an emoji instead of image

   You can pass in the unicode representation of the emoji from the List in imageUrl prop.

5. I need to format the title

   The title prop supports markdown, feel free to use it.

The generator uses a web component to create the default output and provides a repository level prop to customise this web component.

The component currently being used is on Github and published on NPM. The default URL is from Unpkg with https://unpkg.com/@agney/og-image-element@0.2.0.

You can substitute the same with componentUrl input in your workflow file. For more info on creating this web component, visit source

See docs

1. Zeit OG Image

   Serverless based open graph image generator from zeit

2. Zeit NCC

3. Github Image Actions

   For some utils to copy from.