# Programmatic mode

You can use `new Cap({ ... })` in your client-side JavaScript to create a new Cap instance and use the `solve()` method to solve the challenge.

```js
const cap = new Cap({
  apiEndpoint: "/api/",
});
const solution = await cap.solve();

console.log(solution.token);
```

You can also set up [event listeners](widget.md#supported-events):

```js
const cap = new Cap({
  apiEndpoint: "/api/",
});

cap.addEventListener("progress", (event) => {
  console.log(`Solving... ${event.detail.progress}% done`);
});
```

Behind the scenes, Cap creates a hidden `cap-widget` element and uses it to solve the challenge.

## Supported methods and arguments

The following methods are supported:

#### `new Cap({ ... })`

Creates a new Cap instance. If a 2nd argument is provided, it will use that element instead of creating a new one in memory.

**Arguments**

```json
{
  apiEndpoint: ..., // api endpoint, similar to the widget `data-cap-api-endpoint` attribute
  workers: navigator.hardwareConcurrency || 8 // number of worker threads to use
}
```

#### `cap.solve()`

Requests and solves a challenge.

**Output:** `{ token }`

#### `cap.token`

Returns the token from the latest solve

#### `cap.reset()`

Resets `cap.token`

#### `cap.addEventListener(..., function () { ... })`

Listens for an event for the cap widget. See [supported events](widget.md#supported-events)