---
title: "Express, Fastify, Koa"
description: "How to use Infisical to inject environment variables and secrets into an Express app."
---

Prerequisites:

- Set up and add envars to [Infisical Cloud](https://app.infisical.com)
- [Install the CLI](/cli/overview)

The steps apply to the following non-exhaustive list of frameworks:

- [Express](https://expressjs.com)
- [Fastify](https://www.fastify.io)
- [Koa](https://koajs.com)

## Initialize Infisical for your app

```bash
# navigate to the root of your of your project 
cd /path/to/project

# then initialize Infisical
infisical init
```

## Start your application as usual but with Infisical

```bash
infisical run -- <your application start command>

# Example
infisical run -- npm run dev
```