The Gatsby Blog theme

A Gatsby theme for creating a blog.

Installation

$3

If you're creating a new site and want to use the blog theme, you can use the blog theme starter. This will generate a new site that pre-configures use of the blog theme.

``shell
gatsby new my-themed-blog https://github.com/gatsbyjs/gatsby-starter-blog-theme
`

$3

If you already have a site you'd like to add the blog theme to, you can manually configure it.

1. Install the blog theme

`shell
npm install gatsby-theme-blog
`

2. Add the configuration to your gatsby-config.js file

`js
// gatsby-config.js
module.exports = {
plugins: [
{
resolve: gatsby-theme-blog,
options: {
// basePath defaults to /
basePath: /blog,
},
},
],
}
`

3. Add blog posts to your site by creating md or mdx files inside /content/posts.

> Note that if you've changed the default contentPath in the configuration, you'll want to add your markdown files in the directory specified by that path.

4. Add an image with the file name avatar (can be jpg or png) inside the /assets directory to include a small image next to the footer on every post page.

> Note that if you've changed the default assetPath in the configuration, you'll want to add your asset files in the directory specified by that path.

5. Run your site using gatsby develop and navigate to your blog posts. If you used the above configuration, your URL will be http://localhost:8000/blog

Usage

$3

| Key | Default value | Description |
| ------------------------ | ------------------------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| basePath | / | Root url for all blog posts |
| contentPath | content/posts | Location of blog posts |
| assetPath | content/assets | Location of assets |
| mdxOtherwiseConfigured | false | Set this flag true if gatsby-plugin-mdx is already configured for your site. |
| preset | gatsby-theme-ui-preset | Theme UI compatible package name that will act as the base styles for your project. Be sure to install the package you're referencing. Set to false to ignore all presets and only use local styles. |
| prismPreset | null | Theme UI compatible package name that will act as the prism syntax highlighting for your project. Be sure to install the package you're referencing. For themes in @theme-ui/prism the name will suffice, e.g. prism-okaidia. |
| excerptLength | 140 | Length of the auto-generated excerpt of a blog post |
| webfontURL | '' | URL for the webfont you'd like to include. Be sure that your local theme does not override it. |
| imageMaxWidth | 1380 | Set the max width of images in your blog posts. This applies to your featured image in frontmatter as well. |
| filter | {} | Set the posts filter, for example: { frontmatter: { draft: {ne: true} } } |
| limit | 1000 | Set the amount of pages that should be generated |

#### Example configuration

`js
// gatsby-config.js
module.exports = {
plugins: [
{
resolve: gatsby-theme-blog,
options: {
// basePath defaults to /
basePath: /blog,
prismPreset: prism-okaidia,
},
},
],
}
`

$3

In addition to the theme options, there are a handful of items you can customize via the siteMetadata object in your site's gatsby-config.js

`js
// gatsby-config.js
module.exports = {
siteMetadata: {
// Used for the site title and SEO
title: My Blog Title,
// Used to provide alt text for your avatar
author: My Name,
// Used for SEO
description: My site description...,
// Used for resolving images in social cards
siteUrl: https://example.com,
// Used for social links in the root footer
social: [
{
name: Twitter,
url: https://twitter.com/gatsbyjs,
},
{
name: GitHub,
url: https://github.com/gatsbyjs,
},
],
},
}
`

$3

The following are the defined blog post fields based on the node interface in the schema

| Field | Type |
| ---------------- | -------- |
| id | String |
| title | String |
| body | String |
| slug | String |
| date | Date |
| tags | String[] |
| excerpt | String |
| image | String |
| imageAlt | String |
| imageCaptionText | String |
| imageCaptionLink | String |
| socialImage | String |

$3

Blog posts can include references to images inside frontmatter. Note that this works for a relative path as shown below, or an external URL.

`md
---
title: Hello World (example)
date: 2019-04-15
image: ./some-image.jpg
---
`

image refers to the featured image at the top of a post and is not required. It will also appear as the preview image inside a social card. Note that this requires you to set siteUrl in your gatsby-config.js file metadata to your site's domain.

When adding an image, imageAlt is available to provide alt text for the featured image within the post. If this is not included, it defaults to the post excerpt.

You may want to use a different image for social sharing than the one that appears in your blog post. You can do so by setting socialImage in frontmatter.

$3

This theme enables gatsby-plugin-theme-ui which allows you to leverage Theme UI to style your project.

By default, gatsby-theme-ui-preset operates as your base theme styles. Any local shadowed styles deep merge with that preset.

Alternatively, you can pass a preset of your own choosing by installing the package and passing the package name as the preset in gatsby-config.js. Again, local shadowed styles will deep merge with this preset if they exist.

`js
// gatsby-config.js
module.exports = {
plugins: [
{
resolve: gatsby-theme-blog,
options: {
preset: my-preset-name-here,
},
},
],
}
`

If you'd rather use only local shadowed styles with no underlying preset, pass the preset option as false.

#### Prism

You can also configure your prism theme for syntax highlighting in code snippets by passing the prismPreset option.

@theme-ui/prism is included by default, so any available presets can be passed using only their name, e.g. dracula.

`js
// gatsby-config.js
module.exports = {
plugins: [
{
resolve: gatsby-theme-blog,
options: {
prismPreset: dracula,
},
},
],
}
`

As an alternative, you can install a package with a prism theme into your project and pass the package name.

This option is null by default, and in all cases local shadowed styles take precedent.

##### Highlight Line

You can highlight code snippets using // highlight line or a combination of // highlight-start and // highlight-end.

To update the styling for these highlights override the .highlight styles inside your prism theme.

$3

This theme comes equipped with skip-nav. Note that if you override header.js you'll need to add the SkipNavLink component yourself. Additionally, if you override layout.js you'll need to include SkipNavContent` manually.

Migration

For migration guides please see the dedicated migration guide.