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Local Development
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Cal.com runs with pretty minimal hardware requirements by itself. The most intensive part for the software is when you actually build the software, but once it's running it's relatively lightweight.

Cal.com works with a very large range of operating systems, as it only requires JavaScript execution to run. Cal.com is known to work well with Windows, Mac, Linux and BSD. Although they do work well on all of them, for production deployments we would suggest Linux as the ideal platform. Any operating system that runs Node.js should be able to work too, but these are some of the common operating systems that we know work well.

To run Cal.com, you need to install a few things. Node.js, yarn, Git and PostgreSQL. We use Prisma for database maintenance, and is one of the dependencies. We won’t publish installation guides for these as they have their own resources available on the internet. If you're on Linux/BSD, all of these things should be readily available on your package manager. Your best bet is searching for something like Debian 12 PostgreSQL, which will give you a guide to installing and configuring PostgreSQL on Debian Linux 12.

To ensure optimal performance and compatibility, we highly recommend using Node.js version 18 for your development environment. This version provides the best balance of stability, features, and security for this project. Please make sure to update your Node.js installation if necessary.

Development Setup & Production Build

  1. First, you git clone the repository with the following command, so you have a copy of the code. 
    git clone https://github.com/calcom/cal.com.git
If you are on windows, you would need to use the following command when cloning, with **admin privileges**: ```git git clone -c core.symlinks=true https://github.com/calcom/cal.com.git ```

  1. Then, go into the directory you just cloned with

    cd cal.com

    and run

    yarn

    to install all of the dependencies. Essentially, dependencies are just things that Cal.com needs to install to be able to work.

  2. Then, you just need to set up a couple of things. For that, we use a .env file. We just need to copy and paste the .env.example file and rename the copy to .env. Here you'll have a template with comments showing you the settings you need/might want to set.

  3. Next, use the command

    openssl rand -base64 32

    (or another secret generator tool if you prefer) to generate a key and add it under NEXTAUTH_SECRET in the .env file.

  4. You'll also want to fill out the .env.appStore file similar to the .env file as this includes keys to enable apps.

Development tips

Add NEXT_PUBLIC_DEBUG=1 anywhere in your .env to get logging information for all the queries and mutations driven by trpc.

echo 'NEXT_PUBLIC_DEBUG=1' >> .env

For email testing, set it to "1" if you need to email checks in E2E tests locally. Make sure to run mailhog container manually or with yarn dx.

echo 'E2E_TEST_MAILHOG_ENABLED=1' >> .env

E2E Testing

Be sure to set the environment variable NEXTAUTH_URL to the correct value. If you are running locally, as the documentation within .env.example mentions, the value should be http://localhost:3000.

In a terminal just run:

yarn test-e2e

To open last HTML report run:

yarn playwright show-report test-results/reports/playwright-html-report

Manual setup

  1. Configure environment variables in the .env file. Replace <user>, <pass>, <db-host>, <db-port> with their applicable values

    DATABASE_URL='postgresql://<user>:<pass>@<db-host>:<db-port>'

  2. Set a 24 character random string in your .env file for the CALENDSO_ENCRYPTION_KEY (You can use a command like

    openssl rand -base64 24

    to generate one).

  3. Set up the database using the Prisma schema (found in packages/prisma/schema.prisma)

    yarn workspace @calcom/prisma db-deploy

  4. Run (in development mode)

    yarn dev
When you're testing out the enterprise features locally, you should see a warning shown in the image below, clarifying the need to purchase a license for such features in production.

Development quick start with yarn dx

  • Requires Docker and Docker Compose to be installed

  • Will start a local Postgres instance with a few test users - the credentials will be logged in the console

yarn dx

Cron Jobs

There are a few features which require cron job setup. At cal.com, the cron jobs are found in the following directory:

/apps/web/pages/api/cron

App store seeder

We recommend using the admin UI/wizard instead of the seeder to enable app store apps

API

Step 1

Copy the .env files from their respective example files depending on the version of the API (v1 or v2):

cp apps/api/.env.example apps/api/{version}/.env
cp .env.example .env

Step 2

Install packages with yarn:

yarn

Running API server

Run the API V1 with yarn:

yarn workspace @calcom/api dev

Run the API V2 with yarn: Please note API V2 requires the database running in docker

yarn workspace @calcom/api-v2 dev
On windows, you would need to update the script to explicitly set port to 3003 and run yarn dev under `apps/api/package.json` So, it should look something like this after the changes:

"dev": "set PORT=3003 && next dev" Now, running yarn workspace @calcom/api dev should start the server.

Open http://localhost:3003 with your browser to see the result.

If you wish to test how API works locally, please check out our guide here.