We extended the Hexo filter and added theme_inject, so user can add the desired custom content to any injection point.


hexo.extend.filter.register('theme_inject', function(injects) {
// ...

A injects argument will get passed into the function, so we can use it add custom code in injectPoint as following.

For inject view:

// The name of same `injectPoint` suggest be unique. If same, it will override low priority configurations.
// `locals` and `options` is the same as partial https://hexo.io/docs/helpers#partial.
// `order` defines the order of injection, which by default depends on the priority of injection.
hexo.extend.filter.register('theme_inject', function(injects) {
// it will put code from this filePath into injectPoint.
injects.[injectPoint].file(name, filePath, [locals, options, order]);
// it will put raw string as code into injectPoint.
injects.[injectPoint].raw(name, raw, [locals, options, order]);

You have to note filePath, it must be absolute path or relative to hexo_dir.

For inject style:

hexo.extend.filter.register('theme_inject', function(injects) {
// it will put styleFile into injectPoint.

These are many injectPoint, defined in injects-point.js

module.exports = {
views: ['head', 'header', 'sidebar', 'postMeta', 'postBodyEnd', ..., 'footer', 'bodyEnd'],
styles: ['variable', 'mixin', 'style']

custom_file_path also uses this API, see default-injects.js. It will consume custom name in view inject points. So if you use custom_file_path, please not use custom.


One: load a custom script. We can add it in bodyEnd.

hexo.extend.filter.register('theme_inject', function(injects) {
injects.bodyEnd.raw('load-custom-js', '<script src="js-path-or-cdn.js"></script>', {}, {cache: true});

Two: add a custom my-favourite-food.njk to sidebar.

Step1: you should create my-favourite-food.njk in any path(e.g. source/_data/) as below. You can get variable from hexo or local defined in filter.

{% for food in foods %}
<div>{{ food }}</div>
{% endfor %}

Step2: add filter to load it.

hexo.extend.filter.register('theme_inject', function(injects) {
injects.sidebar.file('my-favourite-food', 'source/_data/my-favourite-food.njk', {
foods: ['apple', 'orange']

Three: want to have big header, put big-header.styl to NexT.

Of course, you need to create this file first(e.g. source/_data/big-header.styl).

h1 {
font-size: 2rem;

And then add it in filter.

hexo.extend.filter.register('theme_inject', function(injects) {


We also support hexo's plugin system, which makes it easy to extend functions without modifying the source code of the core module. You can see https://hexo.io/docs/plugins.html#Plugin to learn how to create a plugin.