---
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
Baked into the binary at build time. For anything secret, use [Secrets](/bindings/secrets) instead — a var is not encrypted and is visible in the artifact.
:::