Difficulties of API Testing

Cover Image for Difficulties of API Testing
Ankit Kumar
Table of Contents

When I was working as an intern in a tech company, I came to know about API testing which was a hectic job, along with so many difficulties and frustrations, So I decided to find out several kinds of difficulties that are faced during the testing process which are mentioned below.

Firstly let’s discuss some technical aspects

1-Securing Rest API Parameter combination

Generally, an API consists of many parameters, where the purpose of the API parameter is to pass data values through the API endpoint according to the data request. Choosing the wrong REST API parameter combinations can trigger faulty program states that might potentially expose APIs to external attacks or cause crashes.

2-Sequencing the API calls

In some cases, API needs to be arranged in the proper sequence to function properly. Let’s take an example of a web app where a person can create his profile and can delete his profile, Now let’s say if the testing team tests the profile deletion feature before the profile creating feature then the tester will be getting an undesired response. So, an unordered sequence of APIs creates a mess for testers.

3-Validating REST API parameter

It is important to validate the API parameters because a malicious attacker might call the API with parameters that don’t fit the expected data type or value ranges.

4-Maintaining Data Formatting

In API testing, data formatting describes the schema that specifies how data is formatted, since this schema handles responses and requests of REST APIs, it has to be maintained and updated regularly to ensure that newly added parameters are included in the schema.

5-Setting up an Automated REST API Test

The initial configuration is the part of automated REST API testing that requires the most manual effort.

6-REST API Error Reporting

Conventional black box testing tools can’t measure the test coverage during REST API testing, which greatly reduces the value of test reports. white-box testing approaches enable testers to generate inputs that cover large parts of REST APIs, While providing details error reports and code-coverage visibility.

7-System integration

It is important to make sure that the API system works properly with the data tracking system. For example, a shipment platform that uses shipment tracking API tracks all the information across the available carriers and the outside platform. Here we need to validate all responses to ensure that call is working properly. This information is used to measure the API performance.

8-Initial setup of API Testing

Getting the testing infrastructure up and running is often one of the most challenging parts of the process not because it is difficult but because it can be a motivation killer.

9-Updating of API request testing scheme

The data format that handles requests and responses for the API — needs to be maintained throughout the testing process. Any update to the program that creates additional parameters for the API calls need to be reflected in the schema configuration.

Now coming towards Some theoretical aspects

1-Limited Time

Generally, testers get less time for testing as compared to developers, which becomes hectic for testers to give the best output.

2-Communication gap

Many bugs arise while the testing process, which interrupts the testing flow therefore proper communication is important between developers and testers.

3-Poor API Documentation

Poor documentation creates a lot of difficulties for testers in understanding the code.

4-Building flow is challenging

Building flow while testing requires proper coordination between the testing team and the developer team.


  • ankit

    Ankit is a creative individual with a knack for enhancing efficiency through organization. He thrives in navigating unique challenges, both in his professional and personal spheres. An early riser by nature, Ankit harnesses his mornings for personal development and dedicates his evenings to mentoring others. With an entrepreneurial spirit at his core, he not only spearheads his own startup endeavors but also delights in conceptualizing and advising on the startups and products of others. Ankit boasts a diverse skill set, including: - Product Management - Meta Advertising - Google Analytics - User Experience (UX) Design - Frontend Development with React - Figma / Canva Expertise - Jira / Miro / notion Proficiency - SQL - balsamic


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