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Rest API Testing with JMeter (Step by Step Guide)

I'm sure you're here because you need to load test a Json Rest API. It's not a surprise since Rest API are increasingly popular these days.

That's the purpose of this guide: help you load test a Json Rest API through a concrete example, OctoPerf's Json Rest API.

And this guide will completely get you through the following knowledge:

No theory here, only practice: everything is based on a realistic Rest API (not a dummy example). You can download the sample JMX while following the tutorial.

Ready to learn? Let's go!

JMeter Assertions: The Ultimate Guide

Whether you want to:

  • Check if the server response contains a specific string,
  • Or Verify the server returned an HTTP 200 OK,
  • Or check the value of a json field (using JsonPath like $.store..price).

Assertions are the way to go.

The problem is: you don't know how to get started. And the number of available assertions is overhelming. No worries!

This ultimate guide on JMeter Assertion explores every single assertion type through comprehensive examples. You'll know when and how to use each kind of assertion wisely. Once you've read this guide, assertions won't have any secrets for you anymore! Let's go.

How to Install JMeter on Windows

JMeter isn't particularly hard to install. But that's easy to say when you've done it many times.

Basically if you want to get started with JMeter on Windows. That's great because this guide is for you! Let's see how to install JMeter on Windows.

Install Java

Check Java Version

JMeter is a Java program: the Java Virtual Machine must be installed prior to installing JMeter.

To check if Java is installed properly:

  • Open a Command-Line console by clicking on the start menu then type cmd,
  • Enter the command: java -version.

Java Version

JMeter CSS JQuery Extractor

I guess if you are here, chances are you have already visited our JMeter series on variable extraction:

There is another way to extract content from a server response: Using CSS Selectors or JQuery Selectors.

Let's see how we can leverage selectors to extract variables with JMeter!