Project Structure

Note: This page refers to our main product repo, not our website.

Directory Tree

.
├── .github
├── .platform
├── bin
├── cypress
├── ee  
├── frontend
│   └── public
│   └── src
│       └── editor
│       └── layout
│       └── lib
│       └── models
│       └── scenes
│       └── style
│       └── toolbar
├── posthog
│   └── api
│   └── management
│   └── migrations
│   └── models
│   └── queries
│   └── tasks
│   └── templates
│   └── test
└── requirements

*Selected subdirectories only

.github

Directory for our GitHub actions and templates for issues and pull requests.

.platform

Scripts for deploying to Platform.sh.

bin

Executable shell scripts for various purposes, most notably building, testing, and running PostHog.

cypress

Hosts our Cypress tests. When writing tests that use Cypress, you will mostly be working on the integration/ subdirectory. Remember that you should always be including tests if you are making a significant change to our frontend.

ee

Enterprise Edition features for PostHog. This subdirectory is the only subdirectory not MIT-Licensed in the PostHog/posthog repository, and a license is needed to use its features. To use PostHog with 100% FOSS code, refer to our PostHog/posthog-foss repository.

frontend

Hosts the PostHog frontend, built with React.

Subdirectories

public

PostHog logos to be used by the app.

src

Code for the frontend.

src/editor

Component used to load the PostHog Toolbar on a webpage.

src/layout

Components referring to the overall PostHog app layout, such as sections of the app used in most pages, like Sidebar.js.

src/lib

Various components used all around the PostHog app. Reusable components will most likely be placed in this subdirectory, such as buttons, charts, etc.

src/models

Kea models for the app's state.

src/scenes

Components referring to specific pages of the PostHog app. Mostly non-reusable.

src/styles

Sass files for the PostHog app's style.

toolbar

All code related exclusively to the PostHog Toolbar.

posthog

Hosts the PostHog backend, built with Django.

Subdirectories

api

Subdirectory for PostHog's REST API. Includes its own tests.

management

Custom Django management commands. Commands defined here are registered as manage.py commands and can be called with:

./manage.py <your_command_here>
# or
python manage.py <your_command_here>

These commands are for admin use only, and generally refer to the configuration of your Django app.

migrations

Hosts the Database migrations which occur when there are changes to the models. If you make any changes to the app's ORM, you need to first make migrations:

python manage.py makemigrations

And after making your own migrations or running git pull after new migrations, you also need to apply them:

python manage.py migrate

Clickhouse Migrations

To create boilerplate for clickhouse migrations use

python manage.py create_ch_migration --name <name of migration>

To apply clickhouse migrations use

python manage.py migrate_clickhouse

models

Subdirectory for the models (Django ORM). Interactions with our database are handled by these models.

queries

Hosts the queries used to query data from our database, which will be used by our various features, such as Retention and Trends.

tasks

Celery tasks that happen in the "background" of the server to enhance PostHog's performance by preventing long processes from blocking the main thread. An example of task is processing events as they come in.

templates

Django templates used to generate dynamic HTML. We use templates for pages such as /login and /setup_admin.

test

Subdirectory hosting our backend tests. You should always include tests when you make changes to our backend.

requirements

Hosts our backend's dev requirements.