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How to Validate Value in Response Array Using Postman

Discover how to effectively validate specific values in JSON response arrays using Postman, ensuring your API tests are accurate and reliable. --- This video is based on the question https://stackoverflow.com/q/76162288/ asked by the user 'Cinthiya Singh' ( https://stackoverflow.com/u/8241274/ ) and on the answer https://stackoverflow.com/a/76166741/ provided by the user 'Christian Baumann' ( https://stackoverflow.com/u/641135/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions. Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: How to validate value in response array Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l... The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license. If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com. --- How to Validate Value in Response Array Using Postman When working with APIs, validating responses is crucial to ensure that your application behaves as expected. One common scenario involves checking whether a specific value in the JSON response body matches an expected result. In this guide, we’ll explore how you can validate the value in a response array using Postman. The Problem Consider you’re testing an API that returns a JSON object with various fields. Here’s an example of a response body you might receive: [[See Video to Reveal this Text or Code Snippet]] In this response, you need to validate whether the error_msg in the data object equals the expected string: token失效,请重新登录. But how do you implement this check in your Postman test script? The Solution To validate the value of error_msg, you can use Postman's powerful testing capabilities. Here’s a breakdown of how to create a validation test in your Postman script. Step-by-Step Guide Parse the JSON Response: First, you need to parse the JSON response so that it can be easily understood and manipulated. This is done using the built-in pm.response.json() function. Set Up Environment Variables: You might want to check an environment variable (for example, token_status) to determine the flow of your tests. For this example, we will just focus on validating the error_msg. Write the Test: Use the pm.expect() assertion to check if the error_msg matches the expected string. Example Code Here’s how the complete test script would look: [[See Video to Reveal this Text or Code Snippet]] Important Notes Ensure Correct Path: Make sure that you are accessing the correct path for your value. In this case, jsonData.data.error_msg points directly to the error message you want to validate. Handling Response Status: In the example, different tests are executed depending on the state of token_status. This allows you to structure your tests effectively. Conclusion Validating values in JSON responses using Postman is straightforward once you understand how to parse the response and use assertions properly. By following the steps outlined in this post, you can ensure that your API responses meet expectations, improving the reliability of your applications. With these tools, you're now equipped to create robust tests for your APIs, ensuring your code is both reliable and efficient. Happy testing!