---
title: Constant options
---
If your option is a scalar value (like a string or a number),
it will be treated as a constant. Constant options are never
exposed in the frontend, but can still be set when using FreeSewing
via the API.
## Structure
Any option holding a scalar value is a constant option.
## Example
```js
const part = {
name: 'example.front',
options: {
collarFactor: 4.8,
fitCollar: false,
},
draft: ({ part }) => part
}
```
:::tip
##### Why would you use this?
There are typically two use-cases for constant options:
- Rather than define constants in your code, it's good practice to set
them in your configuration file. This way, people who use your
part as a dependency can override them if they would like to.
- A constant option can be used as a feature-flag. Enabling or disabling
parts of the code beyond the control of the end user, but accessible to
developers.
:::
ab3204f9f1