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devtools

CATS: Automated API Testing

Get robust API testing with CATS, a tool for startup founders and developers. 1.4k+ GitHub stars
1,360 stars89 forksJavaQuality 8/10Updated 7/3/2026100% free ยท open source
What it does

CATS automatically generates, runs, and reports tests for OpenAPI endpoints with minimal configuration and no coding effort, providing robust API testing and negative testing capabilities.

Install / run
git clone https://github.com/Endava/cats.git
When to use it
  • โ€ขWhen you need to test OpenAPI endpoints without manually writing test cases
  • โ€ขWhen you want to ensure your API is resilient to unexpected input or edge cases
  • โ€ขWhen you need to reduce manual testing effort and maintenance for your API
Quick start
  1. 1Navigate to the cloned repository: cd cats
  2. 2Build the project using Maven: mvn clean package
  3. 3Run CATS with the default configuration: java -jar target/cats-1.0.0.jar
  4. 4Configure CATS by modifying the config.yml file to specify your OpenAPI endpoint and testing settings
  5. 5Review the generated test report to identify potential issues with your API
Ready-to-paste prompt
java -jar target/cats-1.0.0.jar -c config.yml -e https://your-api-endpoint.com/openapi.json
Heads up: Ensure you have Java 11 or later installed on your system, as CATS requires this version to run
Saves to your device

Topics

api
fuzzer
java
openapi
rest-api
rest-fuzzer
swagger
testing
What's inside โ€” free to inspect
No purchase needed

Read the entire source before you build โ€” unlike paid marketplaces that hide it behind a buy button.

10
top-level files
6
folders
36.7M
repo size
Apache-2.0
license
Key files
lombok.config
README.md
File tree
.github/
.mvn/
files/
images/
lib/
src/
.gitignore
cats_autocomplete
CODE_OF_CONDUCT.md
CONTRIBUTING.md
LICENSE
lombok.config
mvnw
mvnw.cmd
pom.xml
README.md
Quick Actions
Details
Creator
Endava
Language
Java
Category
devtools
Published
4/2/2020

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