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Postman API Testing Tips

How To Find Cuurent Temp Using Postman

API Testing Blog

Getting Started with Postman

Postman is a powerful tool for API testing and development. One of its many capabilities is retrieving real-time data from APIs, including current temperature information. This guide will walk you through the process of using Postman to access weather data and display the current temperature.

Finding the Right API: OpenWeatherMap

For this example, we’ll use the OpenWeatherMap API. OpenWeatherMap provides a free and extensive weather data API, perfect for our demonstration. The key to success is understanding the API documentation and its endpoints.

Accessing the OpenWeatherMap API Documentation

Visit the OpenWeatherMap website and navigate to the documentation section. You’ll find comprehensive information on available endpoints, required parameters, and expected responses.

Setting up a Postman Request

Step 1: Create a New Request

Open Postman and click on the “New” button to create a new request.

Step 2: Select the HTTP Method

Select “GET” as the HTTP method since we are requesting data from the API.

Step 3: Enter the API Endpoint

In the “Enter request URL” field, paste the OpenWeatherMap API endpoint you’ll be using to retrieve weather data. For example:

https://api.openweathermap.org/data/2.5/weather?q=London,uk&appid=YOUR_API_KEY

Replace “YOUR_API_KEY” with your actual OpenWeatherMap API key. You can sign up for a free account on the OpenWeatherMap website to obtain your API key.

Step 4: Adding Parameters

The OpenWeatherMap API requires specific parameters to function.

  • q: This parameter represents the city name and country code (e.g., London,uk).
  • appid: Your unique API key.

Step 5: Sending the Request

Click the “Send” button to execute your request.

Parsing the Response

How to Parse the JSON Response

The API response will be in JSON format. Postman will automatically display the response in a tab labelled “Body.”

You can navigate within the response to locate the specific data you need.

  • main.temp: This field will display the current temperature in Kelvin.
  • main.feels_like: This field represents the temperature felt by humans.

Converting Kelvin to Celsius or Fahrenheit

To display the temperature in Celsius or Fahrenheit, you can use a code snippet within Postman’s Tests tab.

Here’s an example script for converting Kelvin to Celsius:

pm.test("Temperature conversion", function () {
  var kelvinTemp = pm.response.json().main.temp;
  var celsiusTemp = kelvinTemp - 273.15;
  pm.expect(celsiusTemp).to.be.above(0); // Add appropriate assertions
  console.log("Current temperature in Celsius: " + celsiusTemp.toFixed(2));
});

This script grabs the temperature in Kelvin from the response, performs the conversion, and then displays the Celsius temperature in the console.

Conclusion

By following these steps, you can utilize Postman to retrieve real-time weather data from the OpenWeatherMap API, making it a valuable tool for API testing, as well as data acquisition for internal applications or personal projects. You can adapt the examples provided to your specific needs, focusing on extracting and manipulating the desired data from the API response.

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