---
title: "Use Case: Requesting and parsing a JSON response"
slug: "use-case-requesting-and-parsing-a-json-response"
updated: 2025-12-05T18:47:17Z
published: 2025-12-05T18:47:17Z
canonical: "help.mozenda.com/use-case-requesting-and-parsing-a-json-response"
---

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

# Use Case: Requesting and parsing a JSON response

For this example, we will be scraping active weather alerts from the [United States Weather Service](https://api.weather.gov/). The purpose it to illustrate:

1. Making a request to a web service that returns a JSON response
2. Parsing that response
3. Writing the parsed response to the Mozenda Agent Collection

Concepts that you should familiarize yourself with with to accomplish this are:

1. Mozenda [Run JavaScript action](/vl/docs/custom-javascript)
2. The JavaScript `fetch` function
  1. [https://www.w3schools.com/js/js_api_fetch.asp](https://www.w3schools.com/js/js_api_fetch.asp)
  2. [https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch](https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch)

```
(async function () {
  try {
    // Request active weather alerts from the AL region
    // This request returns a JSON-formatted response
    // You can see the format by loading the URL in a browser
    const url = 'https://api.weather.gov/alerts/active/region/AL';
    const response = await fetch(url);

    // Attempts to convert the JSON text response to a JavaScript 
    // object
    const data = await response.json();

    // Format the response to rows of objects as required by 
    // Mozenda's M_SetFieldValues() function
    
    // Create an array to pass into M_SetFieldValues()
    const rows = [];
    
    // Iterate through the "features" array
    for (const feature of data.features) {
      const row = {};
      row['id'] = feature.id;

      const properties = feature.properties;
      row['headline'] = properties.headline;
      row['description'] = properties.description;
      row['area'] = properties.areaDesc;

      rows.push(row);
    }

    // console.log(rows);
    
    // Write all rows from the response to the Mozenda
    // Agent's output collection
    M_SetFieldValues(rows);
    M_StopWaiting();
  } catch (err) {
    M_StopWithError(err.name, err.message);
  }
}
)();
```

To see the example in action, copy the above code to a RunJavaScript action, and test the Agent.

![Screenshot 2025-12-05 at 11.32.09 AM.png](https://cdn.document360.io/03076343-9561-4857-8a4e-9f3bfed20ced/Images/Documentation/Screenshot%202025-12-05%20at%2011.32.09%E2%80%AFAM.png)