---
title: Vars
description: "Plain-string constants baked into the binary at build time."
---

## Configuration

```jsonc
"vars": { "APP_URL": "https://hello.example.com" }
```

## Usage

```js
env.APP_URL // -> "https://hello.example.com"
```

:::note
Vars are baked into the binary at build time and anyone with the artifact can read them. Put credentials in [Secrets](/docs/bindings/secrets).
:::