Import your Ghost posts into a Jekyll project using Gulp

gulpfile.js

const File = require('vinyl');
const gulp = require("gulp");
const Handlebars = require('handlebars');
const streamArray = require('stream-array');
const ghostContentAPI = require("@tryghost/content-api");

const api = new ghostContentAPI({
  url: 'https://demo.ghost.io',
  key: '22444f78447824223cefc48062',
  version: "v4"
});

const template = `
---
title: {{ title }}
excerpt: {{{ excerpt }}}
feature_image: {{ feature_image }}
tags:
{{#each tags}}
- {{ this.slug }}
{{/each}}
---
{{{ html }}}
`;

const templateFunction = Handlebars.compile(template.trim());

gulp.task('ghost', async function() {
  const posts = await api.posts
  .browse({
    include: "tags,authors",
    limit: "all"
  })
  .catch(err => {
    console.error(err);
  });

  const files = posts.map(post => {
    const { published_at, slug } = post;

    return new File({
      path: `${published_at.slice(0,10)}-${slug}.md`,
      contents: Buffer.from(templateFunction(post))
    });
  });

  // Gulp specific stream stuff
  return streamArray(files)
    .pipe(gulp.dest('./_posts'));
});

package.json

{
  "name": "ghost-to-jekyll",
  "version": "1.0.0",
  "description": "Import Ghost into a Jekyll site",
  "main": "gulpfile.js",
  "scripts": {
    "test": "gulp ghost"
  },
  "author": "David Darnes",
  "license": "MIT",
  "dependencies": {
    "@tryghost/content-api": "^1.2.7",
    "gulp": "^4.0.2",
    "handlebars": "^4.1.2",
    "stream-array": "^1.1.2",
    "vinyl": "^2.2.0"
  }
}