NodeJS Sample Application

Introduction

A simple sample CRUD application and see how seamlessly Keploy integrates with Express and MongoDB. Buckle up, it's gonna be a fun ride! 🎢

🛠️ Platform-Specific Requirements for Keploy

Below is a table summarizing the tools needed for both native and Docker installations of Keploy on MacOS, Windows, and Linux:

Operating System	Without Docker	Docker Installation	Prerequisites
MacOS			Docker Desktop version must be 4.25.2 or above
Windows			- Use WSL wsl --install - Windows 10 version 2004 and higher (Build 19041 and higher) or Windows 11
Linux			Linux kernel 5.15 or higher

On MacOS and Windows, additional tools are required for Keploy due to the lack of native eBPF support.

Quick Installation

Let's get started by setting up the Keploy alias with this command:

 curl --silent -O -L https://keploy.io/install.sh && source install.sh

You should see something like this:

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       ▓█████████▌▓▓   ██▓█▄  ▓█▄▓▓ ▐█▌  ██ ▓█  █▌  ██  █▌ █▓
      ▓▓▓▓▀▀▀▀▓▓▓▓▓▓▌  ██  █▓  ▓▌▄▄ ▐█▓▄▓█▀ █▓█ ▀█▄▄█▀   █▓█
       ▓▌                           ▐█▌                   █▌
        ▓

Keploy CLI

Available Commands:
  example           Example to record and test via keploy
  config --generate generate the keploy configuration file
  record            record the keploy testcases from the API calls
  test              run the recorded testcases and execute assertions
  update            Update Keploy

Flags:
      --debug     Run in debug mode
  -h, --help      help for keploy
  -v, --version   version for keploy

Use "keploy [command] --help" for more information about a command.

🎉 Wohoo! You are all set to use Keploy.

Other Installation Methods

Downloading and running Keploy in Docker

On macOS

1. Open up a terminal window.

2. Create a bridge network in Docker using the following docker network create command:

docker network create keploy-network

3. Run the following command to start the Keploy container:

alias keploy="docker run --name keploy-v2 -p 16789:16789 --network keploy-network --privileged --pid=host -v $(pwd):$(pwd) -w $(pwd) -v /sys/fs/cgroup:/sys/fs/cgroup -v /sys/kernel/debug:/sys/kernel/debug -v /sys/fs/bpf:/sys/fs/bpf -v /var/run/docker.sock:/var/run/docker.sock --rm ghcr.io/keploy/keploy"

Downloading and running Keploy in Native

Prequisites:

• Linux Kernel version 5.15 or higher
• Run uname -a to verify the system architecture.
• In case of Windows, use WSL with Ubuntu 20.04 LTS or higher.

On WSL/Linux AMD

1. Open the terminal Session.
2. Run the following command to download and install Keploy:

curl --silent --location "https://github.com/keploy/keploy/releases/latest/download/keploy_linux_amd64.tar.gz" | tar xz --overwrite -C /tmp
sudo mkdir -p /usr/local/bin && sudo mv /tmp/keploy /usr/local/bin/keploy

On WSL/Linux ARM

1. Open the terminal Session
2. Run the following command to download and install Keploy:

curl --silent --location "https://github.com/keploy/keploy/releases/latest/download/keploy_linux_arm64.tar.gz" | tar xz --overwrite -C /tmp
sudo mkdir -p /usr/local/bin && sudo mv /tmp/keploy /usr/local/bin/keploy

Note: Keploy is not supported on MacOS natively.

With Arkade

1. Installing Arkade

# Note: you can also run without `sudo` and move the binary yourself
curl -sLS https://get.arkade.dev | sudo sh

arkade --help
ark --help  # a handy alias

# Windows users with Git Bash
curl -sLS https://get.arkade.dev | sh

2. Install Keploy

arkade get keploy

Or you can also download specific version of Keploy using the following command:

arkade get keploy@2.2.0-alpha23

Get Started! 🎬

Clone the repository and move to express-mongoose folder

git clone https://github.com/keploy/samples-typescript && cd samples-typescript/express-mongoose

# Install the dependencies
npm install

Installation 📥

Depending on your OS, choose your adventure: There are 2 ways you can run this sample application.

• Using Docker compose : running application as well as MongoDb on Docker container
• Using Docker container for mongoDb and running application locally

Using Docker Compose 🐳

We will be using Docker compose to run the application as well as MongoDb on Docker container.

Lights, Camera, Record! 🎥

Fire up the application and mongoDB instance with Keploy. Keep an eye on the two key flags: -c: Command to run the app (e.g., docker compose up).

--container-name: The container name in the docker-compose.yml for traffic interception.

keploy record -c "docker compose up" --container-name "nodeMongoApp" --build-delay 50

🔥 Challenge time! Generate some test cases. How? Just make some API calls. Postman, Hoppscotch or even curl - take your pick!

Let's generate the testcases.

Make API Calls using Hoppscotch, Postman or cURL command. Keploy with capture those calls to generate the test-suites containing testcases and data mocks.

curl --request POST \
--url http://localhost:8000/students \
 --header 'content-type: application/json' \
 --data '{
  "name":"John Do",
  "email":"john@xyiz.com",
  "phone":"0123456799"
  }'

Here's a peek of what you get:

Student registration successful!

🎉 Woohoo! With a simple API call, you've crafted a test case with a mock! Dive into the Keploy directory and feast your eyes on the newly minted test-1.yml and mocks.yml

Time to perform more API magic! Follow the breadcrumbs... or Make more API Calls

curl --request GET \
--url http://localhost:8080/students

Or simply wander over to your browser and visit http://localhost:8000/students.

Did you spot the new test and mock scrolls in your project library? Awesome! 👏

Run Tests

Time to put things to the test 🧪

keploy test -c "docker compose up" --container-name "nodeMongoApp" --build-delay 50 --delay 10

The --delay flag? Oh, that's just giving your app a little breather (in seconds) before the test cases come knocking.

Your results should be looking all snazzy, like this:

Worry not, just add the ever-changing fields (like our ts here) to the noise parameter to dodge those assertions.

Wrapping it up 🎉

Congrats on the journey so far! You've seen Keploy's power, flexed your coding muscles, and had a bit of fun too! Now, go out there and keep exploring, innovating, and creating! Remember, with the right tools and a sprinkle of fun, anything's possible.😊🚀

Happy coding! ✨👩‍💻👨‍💻✨

**********************************___**********************************

Running App Locally on Linux/WSL 🐧

We'll be running our sample application right on Linux, but just to make things a tad more thrilling, we'll have the database (mongoDB) chill on Docker. Ready? Let's get the party started!🎉

If you are using WSL on windows then use below to start wsl in the user's home directory:

wsl ~

First things first, update the MongoDB URL on line 4, in db/connection.js, from mongodb://mongoDb:27017/keploy to mongodb://127.0.0.1:27017/keploy.

🍃 Kickstart MongoDB

We are going to run a mongo docker container which requires an existing docker network. We need to run the following command to create the required docker network:

docker network create keploy-network

Now, let's breathe life into your mongo container. A simple spell should do the trick:

docker compose up mongo

📼 Roll the Tape - Recording Time!

Ready, set, record! Here's how:

sudo -E env PATH=$PATH keploy record -c 'node src/app.js'

Keep an eye out for the -c flag! It's the command charm to run the app.

Alright, magician! With the app alive and kicking, let's weave some test cases. The spell? Making some API calls! Postman, Hoppscotch, or the classic curl - pick your wand.

Let's generate the testcases.

Make API Calls using Hoppscotch, Postman or cURL command. Keploy with capture those calls to generate the test-suites containing testcases and data mocks.

curl --request POST \
--url http://localhost:8000/students \
--header 'content-type: application/json' \
--data '{
  "name":"John Do",
  "email":"john@xyiz.com",
  "phone":"0123456799"
  }'

Here's a peek of what you get:

Student registration successful!

🎉 Woohoo! Give yourself a pat on the back! With that simple spell, you've conjured up a test case with a mock! Explore the Keploy directory and you'll discover your handiwork in test-1.yml and mocks.yml.

Now, the real fun begins. Let's weave more spells!

🚀 Follow the URL road...!

curl --request GET \  --url http://localhost:8080/students

Or simply wander over to your browser and visit http://localhost:8000/students.

Did you spot the new test and mock scrolls in your project library? Awesome! 👏

Run Tests 🏁

Ready to put your spells to the test?

sudo -E env PATH=$PATH keploy test -c "node src/app.js" --delay 10

Worry not, just add the ever-changing fields (like our ts here) to the noise parameter to dodge those assertions.

Wrapping it up 🎉

Congrats on the journey so far! You've seen Keploy's power, flexed your coding muscles, and had a bit of fun too! Now, go out there and keep exploring, innovating, and creating! Remember, with the right tools and a sprinkle of fun, anything's possible.😊🚀

Hope this helps you out, if you still have any questions, reach out to us .

Contact Us

If you have any questions or need help, please feel free to reach out to us at hello@keploy.io or reach out us on or open a discussion on