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2.3.3 • Public • Published


A static site generator based in Next.js

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What is it?

nextein is a wrapper around next.js that allows you to write static sites using markdown and react.


NodeJS v8.x+ is required to run nextein commands.

Starter Kit

If you want to jump into a starter project check nextein-starter

Getting Started

There are a few steps you have to follow to get your site up and running with nextein

  • Create a project:

    • mkdir my-site
    • cd my-site
    • npm init -y
  • Install Dependencies

    • npm i nextein next react react-dom
  • Add a next.config.js config file

    const { withNextein } = require('nextein/config')
    module.exports = withNextein({
  • Create pages/index.js

    import React from 'react'
    import withPosts from 'nextein/posts'
    import { Content } from 'nextein/post'
    export default withPosts( ({ posts }) => {
      return (
 => <Content {} />)
  • Create a markdown post entry under posts folder (posts/

    title: First Post
    category: post
    This is the first paragraph and it will be used as an excerpt when loaded in a `<Content excerpt />` tag.
    This paragraph should *not* appear in that list.
  • Add npm scripts to run dev mode to your package.json

      "dev": "nextein"
  • Run the development server

  • Add another npm script to your package.json to export the site

      "dev": "nextein",
      "export": "nextein build && nextein export"


See nextein-example for a working example



HOC for /pages components that renders a list of posts. It makes the post list available thru the posts property.

import withPosts from 'nextein/posts'
export default withPosts( ({ posts }) => { /* render your posts here */ } )

inCategory(category, options)

Filter function to be applied to posts to retrieve posts in a given category.

  • category: {String} The category to filter results.
  • options : {Object} Optional
    • includeSubCategories: Boolean true to include posts in sub categories. Default: false

Categories are resolved by the folder structure by default. This means that a post located at posts/categoryA/subOne will have a category categoryA/subOne unless you specify the category name in frontmatter.

import withPosts, { inCategory } from 'nextein/posts'
export default withPosts( ({ posts }) => { 
  const homePosts = posts.filter(inCategory('home'))
  /* render your homePosts here */ 
} )

If you want to retrieve all posts under a certain category, let's say categoryA which will include all those under subOne, use the options includeSubCategories: true.

import withPosts, { inCategory } from 'nextein/posts'
export default withPosts( ({ posts }) => { 
  const categoryAPosts = posts
    .filter(inCategory('categoryA', { includeSubCategories: true }))
  /* render your categoryAPostsmePosts here */ 
} )


Returns an HOC that gets all posts filtered out by the given filter function. This can be used in conjunction with inCategory to get only the desired posts in a certain category.

import { withPostsFilterBy, inCategory } from 'nextein/posts'
const withCategoryAPosts = withPostsFilterBy(inCategory('categoryA'))
export default withCategoryAPosts(({ posts }) => { 
 /* render your posts here */ 


Sort function to be applied to posts to sort by date (newest on top). This requires the post contains a date in frontmatter or in the file name (ala jekyll)

import withPosts, { sortByDate } from 'nextein/posts'
export default withPosts( ({ posts }) => { 
  /* render your posts here */ 
} )


HOC for /pages components that renders a single post. It makes the post available thru the post property.

import withPost from 'nextein/post'
export default withPost( ({ post }) => { /* render your post here */ } )


Component to render a post object. This component receives the content from the post as a property. Use the excerpt property to only render the first paragraph (this is useful when rendering a list of posts).

  • content: {Object} Markdown content in HAST format to be render. This is provided by post.content
  • excerpt: {Boolean} true to only render the first paragraph. Optional. Default: false
  • renderers: {Object} A set of custom renderers for Markdown elements with the form of [tagName]: renderer.
  • prefix: {String} Prefix to use for the generated React elements. Optional. Default: 'entry-'
  • component: {String|React.Component} The component used for the root node. Either a string to use or a React Component.
import withPost, { Content } from 'nextein/post'
export default withPost( ({ post }) => { return (<Content {} />) } )

Using the excerpt property

import withPosts, {inCategory} from 'nextein/posts'
export default withPosts( ({ posts }) => { 
  const homePosts = posts.filter(inCategory('home'))
  return (
    { (post, idx) => <Content key={idx} {} excerpt/> )
} )

Using renderers to change/style the <p> tag

export default withPost( ({ post }) => { 
  return (
    <Content {} 
        p: Paragraph 
} )
const Paragraph = ({ children }) => (<p style={{padding:10, background: 'silver'}}> { children } </p> )


You can use nextein/link instead with the exact same parameters as next/link. This component wraps the next/link one to simplify creating a Link for a given post object. next/link will work out of the box. When passing a to href it will generate the underlying next/link with the post information.

  • data: {Object} Post frontmatter object. This is provided by
import withPosts from 'nextein/posts'
import Link from 'nextein/link'
export default withPosts( ({ posts }) => (
  { (post, idx) => {
      return (
          <Content key={idx} {} excerpt/>
          <Link {}><a>Read More...</a></Link>


  • data is the frontmatter object containig the post meta information (title, page, category, etc)
    • data.url is the generated url for the post
    • data.category is the post's category. When not specified, if the post is inside a folder, the directory structure under posts will be used.
    • JSON date from frontmatter's date or date in file name or file creation date
  • raw is markdown content of the post
  • content is a HAST representation of post content
{ data, raw } = post


There are only a few defined properties in the frontmatter metadata that is used by nextein

page: my-awesome-post
category: categoryOne
date: 2017-06-23
Post Content...
  • page: the component under /pages that will be used to render the post (default to post which reads /pages/post component) Note: If you have an entry that should not be rendered by its own page (such as a part of an index file only) use page: false to avoid generating the url and exporting entry.
  • category: the category name (optional)
  • date: date string in YYYY-MM-DD format. Used to sort posts list. (optional)
  • published: Set to false to remove this post from entries.
  • permalink: Set the url using any parameter in the frontmatter object. Default value /:category?/:name. The ? means the parameter will be optional.
  • name: Read Only The post file name. Date is removed from name if present.
  • url: Read Only The post url.


A wrapper configuration function to be applied into the next.config.js. It provides a way to add your own next.js config along with nextein internal next.js config.


const { withNextein } = require('nextein/config')
module.exports = withNextein({
  // Your own next.js config here

You can also define nextein plugins using the withNextein configuration:

const { withNextein } = require('nextein/config')
module.exports = withNextein({
  nextein: {
    plugins: [
      ['nextein-plugin-markdown', { entriesDir: ['_posts'] }]
      //your nextein plugins here
  // Your own next.js config here

The nextein.plugins configuration accepts an array of plugins with the following formats:

  • ['plugin-name']: Just a string to define the plugin.
  • ['plugin-name', { }]: A string to define the plugin and a plugins options object.

The plugin name should be a pre-installed plugin (nextein-plugin-markdown) , or a local file (./myplugins/my-awesome-plugin)

Default Plugin (nextein-plugin-markdown)

The default plugin will source the posts using a configurable set of options:

  • extension: Default to md
  • entriesDir: Default to ['posts']
  • raw: Default to true. Make this false to not add the raw content in the post object.
  • position: Default to false. Make this true to add the position info to post content HAST.
  • rehype: Default to []. Add a set of plugins for rehype
  • remark: Default to []. Add a set of plugins for remark


You can write your own plugins. There are basically 2 different types (source and transforms). Source plugins will be called to generate the posts entries and then the transform plugins will receive those entries and can modify, filter, append, or transform in anyway the posts list.

Both types are just async functions. You have to export a source and/or transform method from you plugin main module:

// file: ./plugins/my-plugin
/* source plugin  (options) => post[]  */
module.exports.source = async (options) => { /* return your posts */ }
/* transform plugin (options, post[]) =>  post[] */
module.export.transform = async (options, posts) => { /* return your posts */ }

Then in the next.config.js file you can define your plugin with options as follows. The same options object will be passed to both source and transform methods.

const { withNextein } = require('nextein/config')
module.exports = withNextein({
  nextein: {
    plugins: [
      ['./plugins/my-plugin', { awesome: true }]
  // Your own next.js config here


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