# Installation

You can install verifica into your project as a npm package. It is as simple as:

```
npm install verifica
```

*And voilà!*  Verifica is installed and ready to be used. Now to use it you need to import functionality, e.g.:

```typescript
const { asVerificable, ensure, isString } = require("verifica");
```

And use it:

```typescript
function sayHello(name) {
    const vname = asVerificable(name);
    ensure(vname, isString);
    
    console.log(`Hello ${name}!`);
}
```

Here we ensured that provided `name` argument is a string. To see what other checks (called `Predicates` in verifica) are available out of the box, please see the **Predicates** section of the documentation. Good news are, you can also easily create your own `Predicates` to satisfy your business logic checks!