gatsby-node.js

/**
 * Implement Gatsby's Node APIs in this file.
 *
 * See: https://www.gatsbyjs.org/docs/node-apis/
 */

// You can delete this file if you're not using it
const path = require(`path`)

exports.createPages = async ({ actions, graphql, reporter }) => {
    const { createPage } = actions

    const blogPostTemplate = path.resolve(`src/templates/blogTemplate.js`)

    const result = await graphql(`
    {
      allMarkdownRemark(
        sort: { order: DESC, fields: [frontmatter___date] }
        limit: 1000
      ) {
        edges {
          node {
            frontmatter {
              path
            }
          }
        }
      }
    }
  `)

  // error handling
  if (result.errors) {
      reporter.panicOnBuild(`Error while running graphql`)
      return
  }

  result.data.allMarkdownRemark.edges.forEach(({ node }) => {
      createPage({
          path: node.frontmatter.path,
          component: blogPostTemplate,
          context: {}, //any additional data
      })
  })
}