What Scripting Language Does LoadRunner Use?


Larry Thompson

Scripting languages play a crucial role in LoadRunner, a popular performance testing tool used by software testers and developers. LoadRunner primarily uses the Virtual User Scripting (VUS) framework to create test scripts.

The VUS framework supports multiple scripting languages, allowing users to choose the language they are most comfortable with. The supported scripting languages in LoadRunner include:

1. JavaScript:

JavaScript is a widely used scripting language that is known for its versatility and ease of use.

In LoadRunner, JavaScript can be used to create VUS scripts for performing various actions during a performance test. It provides developers with a rich set of functions and libraries to manipulate web elements, handle dynamic data, and simulate user interactions.

2. C:

C is a powerful programming language that offers low-level control over system resources.

In LoadRunner, C-based VUS scripts are often used to create complex scenarios that require precise control over network protocols, data manipulation, and advanced algorithms. While C may require more programming expertise compared to other scripting languages, it offers superior performance and flexibility.

3. Java:

Java is another popular choice for scripting in LoadRunner.

With its vast ecosystem of libraries and frameworks, Java enables developers to build robust and scalable VUS scripts. Java’s object-oriented approach simplifies code maintenance and allows for easy integration with external systems or APIs.

4. .NET:

LoadRunner also supports .NET languages such as C# and VB.NET for scripting purposes. This makes it convenient for organizations already using Microsoft technologies to leverage their existing skillsets and infrastructure while conducting performance tests with LoadRunner.

LoadRunner’s flexibility in supporting multiple scripting languages allows users to work with the language they are most proficient in. This not only enhances productivity but also enables teams to leverage their existing knowledge and resources effectively.


In conclusion, LoadRunner supports various scripting languages, including JavaScript, C, Java, and .NET. Each scripting language has its own strengths and areas of application. The choice of scripting language depends on the specific requirements of the performance test and the expertise of the testers or developers involved.

Regardless of the scripting language chosen, LoadRunner’s VUS framework provides a powerful set of tools and capabilities to simulate user actions, analyze system performance, and identify bottlenecks in software applications. So whether you are a JavaScript enthusiast or a C aficionado, LoadRunner has got you covered when it comes to scripting languages for performance testing!

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