---
title: "Parameters"
slug: "081-core-parameters"
updated: 2025-05-23T22:36:47Z
published: 2025-05-23T22:36:47Z
canonical: "docs.developer.comcast.com/081-core-parameters"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.developer.comcast.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Parameters

**Parameters Module 0.8.1 | Core SDK**

## Overview

Methods for getting initialization parameters for an app cold launch.

## OpenRPC

Firebolt APIs are maintained in the [rdkcentral/firebolt-core-sdk](https://github.com/rdkcentral/firebolt-core-sdk) GitHub repository.

You can see this API in the [parameters.json](https://github.com/rdkcentral/firebolt-core-sdk/blob/main/src/modules/parameters.json) OpenRPC JSON-Schema document.

## Usage

To use the Parameters module, you can import it into your project from the Firebolt SDK:

```
import { Parameters } from '@firebolt-js/sdk'
```

## Methods

### initialization

Returns any initialization parameters for the app, e.g. initialial `NavigationIntent`.

```
function initialization(): Promise<AppInitialization>
```

Promise resolution:

| Type | Description |
| --- | --- |
| [`AppInitialization`](/docs/081-core-parameters#appinitialization) | The initialization parameters. |

**Examples**

Default Example

JavaScript:

```
import { Parameters } from '@firebolt-js/sdk'

Parameters.initialization()
    .then(init => {
        console.log(init)
    })
```

Value of `init`:

```
{
  "lmt": 0,
  "us_privacy": "1-Y-",
  "discovery": {
    "navigateTo": {
      "action": "entity",
      "data": {
        "entityId": "abc",
        "entityType": "program",
        "programType": "movie"
      },
      "context": {
        "source": "voice"
      }
    }
  }
}
```

**JSON-RPC:**

Request:

```
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "parameters.initialization",
  "params": {}
}
```

Response:

```
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "lmt": 0,
    "us_privacy": "1-Y-",
    "discovery": {
      "navigateTo": {
        "action": "entity",
        "data": {
          "entityId": "abc",
          "entityType": "program",
          "programType": "movie"
        },
        "context": {
          "source": "voice"
        }
      }
    }
  }
}
```

---

## Schemas

### AppInitialization

```
type AppInitialization = {
  us_privacy?: string                  // The IAB US Privacy string.
  lmt?: number                         // The IAB limit ad tracking opt out value.
  discovery?: {
    navigateTo?: NavigationIntent      // A Firebolt compliant representation of a user intention to navigate to a specific place in an app.
  }
  secondScreen?: {
    launchRequest?: SecondScreenEvent  // An a message notification from a second screen device
  }
}
```

See also:

- [NavigationIntent](/docs/081-core-Intents-schemas#navigationintent)
- [SecondScreenEvent](/docs/081-core-SecondScreen-schemas#secondscreenevent)

---