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Discover how to modify the response of a POST request in Postman to replace a remote URL with the localhost URL using a custom script.
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This video is based on the question https://stackoverflow.com/q/73894765/ asked by the user 'Carlos Sá' ( https://stackoverflow.com/u/2414834/ ) and on the answer https://stackoverflow.com/a/73939179/ provided by the user 'Carlos Sá' ( https://stackoverflow.com/u/2414834/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Easily Change the Response URL in Postman with a Simple Script

When working with APIs in Postman, you might come across situations where you need to customize the response you receive after making a POST request. This can be particularly useful during local development, where you want to replace a remote URL with one that points to your localhost. In this guide, we will guide you through the steps to change part of the response from a POST request made to a login API in Postman.

The Problem: Changing the Response URL

Let's say you execute a POST request to your login API, and the server returns a JSON response like this:

[[See Video to Reveal this Text or Code Snippet]]

However, for your local development, you want to tailor the response to look like this:

[[See Video to Reveal this Text or Code Snippet]]

The question is: Is it possible to change this URL in Postman's response?

The Solution: Utilizing Postman Visualizer

Yes, it is entirely possible! The solution involves using Postman’s built-in visualizer feature, which allows you to manipulate the response using JavaScript. Here’s how you can do it step-by-step:

Step 1: Set Up the Visualizer

First, navigate to the Tests tab in your Postman request. This is where we will write the script to manipulate the response. You’ll need to structure your script to first parse the JSON response and then replace the specified part of the URL.

Step 2: Implement the Script

Here’s the code you need to put in the Tests tab:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Run Your Request

Now that you've set up your script, execute the POST request again.

Step 4: Copy the Modified URL

Once the response is received, you will see that your redirect_uri has changed. There will also be a button labeled Copy Url. Click on it, and the modified URL will be copied to your clipboard, ready for use in your browser!

Conclusion

Customizing response URLs in Postman can expedite your development and debugging process significantly. By using the visualizer and a small JavaScript code snippet, you can easily replace any part of the response with whatever you need. This not only saves time but also allows for a smoother workflow when transitioning between different environments (e.g., from production to local development).

So, next time you need to adjust a POST request response in Postman, remember this easy approach! Happy coding!