This example uses a custom excerpt_separator.

You can manually mark in your markdown where to stop excerpting—similar to Jekyll. gatsby-transformer-remark uses gray-matter to parse markdown frontmatter, so you can specify an excerpt_separator, as well as any of the other options mentioned here, in the gatsby-config.js file.

{
  "resolve": `gatsby-transformer-remark`,
  "options": {
    "excerpt_separator": `<!-- end -->`
  }
}

Any file that does not have the given excerpt_separator will fall back to the default pruning method.