Vladimir Zhelvis

Software engineerzhelvisvladimir@gmail.com

Vladimir Zhelvis

Software engineerzhelvisvladimir@gmail.com

JAMstack. Modern way to create static sites

📅 12/09/2019
5 min read

Do you want to create blazing fast sites, using your favorite web framework, with support for the latest SEO, PWA and interface availability recommendations without writing a single line of server code? You are welcome!



JAM = JavaScript + APIs + Markup

Despite the name, this is not a set of tools, but a general approach to application design, which consists of three components:

  • JavaScript – Programming language we need to develop browser-based interactive. For very simple sites, you can do without it

  • APIs – Data sources from which static pages will be generated. Anything can serve as a source: databases, CMS or git repository

  • Markup – Literally, this is the markup of the site. At the primitive level, these are interconnected html files.   But often the use of static site generator (SSG), which create pages from received data according to a predetermined pattern


Architecture JAM

Cloud services are used as a backend. All development comes down to designing templates for SSG, which hosted in git repository with data. The repository connects to continuous delivery service (CD), which tracks changes in source code, runs the generator and places the resulting pages in content delivery network (CDN). Developers update the site by sending commits to the repository directly, and non-technical specialists use a cloud-based CMS, also connected to the repository.

Benefits of JAMstack

High load speed and fault tolerance

Since all pages are created in advance, the server does not waste time requesting and parsing data, which allows you to process more requests per second.


The logic of interaction is reduced to transferring the created file by get-request. Simpler the system, the less potential vulnerabilities in it.

Scalability and low support costs

Through the use of CDN, a stable fast response time and high uptime are ensured. Easy integration of the git repository with continuous integration and delivery services (CI/CD) allows you to effectively automate the process of developing, testing, deploying and scaling of application.

Limitations of JAMstack

Slow Content Updates

Any change of data in repository causes a redeployment of project to CD, which may last a few minutes.

Loading dynamic data

If you need pages that must provide dynamic or time sensitive data, then we will have to request and cache them on the client side after loading the page. This is not always a perfect solution.


Based on all the pros and cons, JAMstack is great for developing personal pages, portfolios, blogs, documentation and any other static sites where the speed of updating content is fading into the background.

Blog development example Using Gatsby, Netlify, NetlifyCMS, and GitHub

This guide assumes that you are already familiar with NodeJS software platform, git console client, React library and have GitHub account.

There are a huge number of tools for creating JAM applications. The following stack will be used in this example:

  • Gatsby – Open source generator of static sites from React + GraphQL applications. On the one hand, it has a convenient plugin system, which allows you to develop sites with minimal time, on the other hand have very flexible configuration.

  • NetlifyCMS – Open source content management system that separates the data layer from the display layer (headless CMS). It has convenient integration with git repositories.

  • Netlify – Shareware cloud platform providing tools for continuous deployment and its own CDN.

GitHub will be used to store content and source code.

Creating blog using Gatsby

Install gatsby using node package manager:

npm i -g gatsby-cli

Create a new project:

gatsby new gatsby-blog-example

Change directories into site folder:

cd gatsby-blog-example

Project structure:

|-- /src
|-- /pages
|-- /images
|-- /components
|-- gatsby-config.js
|-- gatsby-node.js
|-- gatsby-ssr.js
|-- gatsby-browser.js

Some notable files and their definitions:

  • gatsby-config.js — configure options for a Gatsby site, with metadata for project title, description, plugins, etc.

  • gatsby-node.js — implement Gatsby’s Node.js APIs to customize and extend default settings affecting the build process

  • gatsby-browser.js — customize and extend default settings affecting the browser, using Gatsby’s browser APIs

  • gatsby-ssr.js — use Gatsby’s server-side rendering APIs to customize default settings affecting server-side rendering

By default, Gatsby creates pages in src/pages folder.

Run local development server:

gatsby develop

You can browse the site at http://localhost:8000/.

site starter

You also have a browser for GraphQL (http://localhost:8000/___graphql), where you can view the data and query patterns that are used when rendering pages.

graphQL browser

We will store blog posts in markdown markup. Let's create a separate folder for blog posts:

mkdir content

And add the file first_post.md with the following content:

path: '/blog/my-first-post'
date: '2019-12-09'
title: 'My first blog post'
# Hello world!
this is my first blog post in markdown.

We declare a set of variables at the beginning of first_post.md using yaml syntax, called frontmatter.

In order for Gatsby to automatically create pages from markdown files and recognize data from frontmatter, we need to use two plugins:

gatsby-source-filesystem is already included in the starter template, so we only need to install the second plugin:

npm i gatsby-transformer-remark

Connect plugins in gatsby-config.js:

plugins: [
resolve: `gatsby-source-filesystem`,
options: {
name: `blog`,
path: `${__dirname}/content`,

Restart our development server. Going to the graphQL browser, we will see that new data has become available to us. We will send test request and get valid response.

Test request

We managed to add a new data source for our generator! It remains only to display content on the site.

First of all, create a blog page template in file src/templates/blogPost.js:

import React from 'react'
import { graphql } from 'gatsby'
import Layout from '../components/layout'
export default function Template({
data, // this prop will be injected by the GraphQL query below.
}) {
const { markdownRemark } = data // data.markdownRemark holds your post data
const { frontmatter, html } = markdownRemark
return (
<div dangerouslySetInnerHTML={{ __html: html }} />
export const pageQuery = graphql`
query($path: String!) {
markdownRemark(frontmatter: { path: { eq: $path } }) {
frontmatter {
date(formatString: "MMMM DD, YYYY")

Now we program in gatsby-node.js, how posts will be rendered. To do this, we use the createPages API described in the specification Gatsby Node APIs:

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(`
sort: { order: DESC, fields: [frontmatter___date] }
limit: 1000
) {
edges {
node {
frontmatter {
// Catch errors
if (result.errors) {
reporter.panicOnBuild(`Error while running GraphQL query.`)
result.data.allMarkdownRemark.edges.forEach(({ node }) => {
path: node.frontmatter.path,
component: blogPostTemplate,

Our post will be available at http://localhost:8000/blog/first-post/

post page

It's time to write a second post! Create file content/second-post.md:

path: '/blog/second-post'
date: '2019-12-09'
title: 'My second blog post'
this is my second amazing post.

Finally, add a list of all the posts to the main page by editing src/pages/index.js:

import React from 'react'
import { Link, graphql } from 'gatsby'
import Layout from '../components/layout'
import SEO from '../components/seo'
const IndexPage = ({ data }) => {
const posts = data.allMarkdownRemark.edges
return (
<SEO title="Home" />
<h1>Hi people</h1>
<p>Welcome to your new Gatsby site.</p>
<p>Now go build something great.</p>
<h2>Blog Posts</h2>
{posts.map(({ node: post }) => (
<li key={`${post.frontmatter.title}`}>
<Link to={post.frontmatter.path}>{post.frontmatter.title}</Link>
<br />
<hr />
<Link to="/page-2/">Go to page 2</Link>
export default IndexPage
export const pageQuery = graphql`
query MyQuery {
allMarkdownRemark {
edges {
node {
frontmatter {

We get the following result after restarting of the development server:

main page of our blog

Delete app tempory files:

gatsby clean

And build production version:

gatsby build

Site data saved in public folder.

Our blog is ready to be published online!

Publish project using GitHub and Netlify

Create new repository on GitHub named gatsby-blog-example and upload our source code:

git add .
git commit -m "init"
git remote add origin https://github.com/[You account]/gatsby-blog-example.git
git push -u origin master

Go to Netlify and sign up, using Github account. You will be redirected to the main dashboard after successful registration.

Netlify dashboard

Creating a new site is divided into three simple steps:

First step is selection the necessary git provider. This is GitHub in our example.

Provider selection

Then we connect repository.

Repository selection

The last step is to set the build options. Netlify by default tracks changes in the master branch of the repository. Specify build command, and select the public folder as the path to the statics.


During building, Netlify downloads the source code from Github, launches Gatsby, and deploy project in its own CDN with adding random domain and SSL certificate. In the settings you can change the domain to your own, as well as familiarize yourself with real-time CD process logs.

Project building

After a short time, your blog will be available for all internet users. This example is located at https://reverent-hodgkin-05f070.netlify.com/.

Successful deploy

When you send commit to master branch, Netlify automatically redeploy the site.

Connect NetlifyCMS

At this stage, we can edit, add and delete posts by sending commits to GitHub. But it’s much more convenient to use a Content Management System for this.

Add a couple of new dependencies to the project:

npm i netlify-cms-app gatsby-plugin-netlify-cms

And connect plugin in gatsby-config.js:

plugins: [...`gatsby-plugin-netlify-cms`]

Create file config.yml in folder static/admin with the following content:

name: git-gateway
branch: master
media_folder: static/img
public_folder: /img
- name: 'blog'
label: 'Blog'
folder: 'content'
create: true
preview: false
- { label: 'Path', name: 'path', widget: 'string' }
- { label: 'Title', name: 'title', widget: 'string' }
- { label: 'Publish Date', name: 'date', widget: 'string' }
- { label: 'Body', name: 'body', widget: 'markdown' }

Upload out changes to GitHub:

git add .
git commit -m "add NetlifyCMS"
git push

Set up authorization for admin panel:

Open Netlify dashboard and go to Site Settings > Identity. Enable Identity service.

Enabling Netlify Identity

The registration in CMS opened by default. We will configure it so that the authors register by invitation.

setting registration options

Go to Identity tab on main dashboard and invite new member.

Inviting new member

Invitation will come to the email. By clicking on the link, register and get access to the CMS panel.

CMS panel

CMS available by /admin URL. Now we have the opportunity to interact with content through a browser.

Source code of this example

Example site published on Netlify