![]() When you’re talking to an API, the server returns an HTTP status code that signals the status of your API request. You can also capture a sequence of calls with a proxy for replay or recording. If you want to import an API call into Postman, you can paste a cURL command as raw text. Reproduce the issue in a developer tool, like Postman, for deeper inspection For example, there might be a third-party service or a change in infrastructure causing the unexpected behavior. If you can’t reliably discern a relationship between the input and output, the problem may not be with the API call itself. This allows you to more easily inspect and tweak the request parameters, headers, and body to compare against the response. Reproduce the issue in your favorite developer tool or API client for deeper inspection. The first step is to isolate the API issue and determine if the issue stems from calling the API, the API itself, processing the output, or something completely unrelated. I’ll demonstrate these debugging examples in Postman, but feel free to use your favorite developer tool or API client. Here is one approach to identifying bugs: But even if you don’t have this level of observability, a consistent approach can reduce the time and effort required to find and fix issues. Ideally, you have a robust testing and monitoring system to alert you when something goes wrong and pinpoint where the problem might be. This can get tricky if you are stringing together a sequence of API calls from different providers or accessing different resources. ![]() Most of the effort goes toward locating the root cause of the issue based on what can be observed. The debugging process aims to understand the relationship between inputs and outputs. In this article, let’s dig into methodologies and principles for debugging REST APIs more quickly and reliably. In addition to experiencing unexpected behavior while accessing an API, you can also make mistakes parsing the output or passing through variables. In many cases, you are debugging code that you might not control, and you are at the mercy of what is observable. What do you do when an API returns something unexpected? Is the issue user inputs, the API itself, or something completely unrelated? For API consumers, debugging means identifying and fixing issues with a single API call or sequence of calls.
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