How to create a Rest API using the serverless framework to use only AWS pay-per-use services, using nestjs as a development framework?

• The basic need is that we need to create a Rest API using Serverless charge-only services.

• The solution will be to define the project through a typical development of a service in nestjs with typescript where initially we will deploy on a local machine and then we will deploy to an AWS account using the Serverless Framework.

Tools or Services:

• Api Gateway
• Lamda Function
• DynamoDB
• Cloudwatch
• IAM Policys
• Nestjs Framework

Steps:

1. Requirements to use AWS CLI:

• AWS account.
• IAM credentials. (Username and Password to enter the console).
• IAM access key pair. (Access Key ID and Secret Access Key).

2. Installing and updating the AWS CLI:

Linux/Ubuntu:

• curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o "awscliv2.zip"
• unzip awscliv2.zip
• sudo ./aws/install

Windows:

- Download and run the AWS CLI MSI installer for Windows (64-bit):

• https://awscli.amazonaws.com/AWSCLIV2.msi
- You can also run the msiexec command to run the MSI installer from PowerShell:

• msiexec.exe /i https://awscli.amazonaws.com/AWSCLIV2.msi

3. AWS CLI Quick Configuration:

Execute the command:

• aws configure

Replace it with your own AWS user account values, as described:

• AWS Access Key ID [None]: XXXXXXXXXXXXXXXXXXXX
• AWS Secret Access Key [None]: XXXXXXXXXXXXXXXXXXXXXXXXXXXXX
• Default region name [None]: us-east-1
• Default output format [None]: json

Validate the AWS CLI configuration:

• aws configure list

4. Configuration of the Serverless Framework Project:

Clone the Serverless Framework project:

• sudo git clone https://github.com/desarrollomarquez/nestjs-serverless-aws.git

Move to the root folder:

• cd nestjs-serverless-aws/

5. Create .env for Project:

The .env environment file must be created with the following variables, these can vary the values:

• IS_OFFLINE=true
• DYNAMODB_ENDPOINT=http://localhost:5000
• USERS_TABLE_NAME=BooksTable

6. Install dependencies:

Install global dependencies :

• sudo npm install --save aws-serverless-fastify or sudo npm install

Install the Serverless Framework dependencies for the services to use:

• sudo serverless plugin install -n serverless-plugin-optimize
• sudo serverless plugin install -n serverless-dynamodb-local
• sudo serverless plugin install -n serverless-offline

Install dynamodb locally for development mode (dev):

• sudo serverless dynamodb install

7. Deployment in Dev:

Generate the build and deploy the serverless development project (dev) offline, here we can perform tests locally to verify the project configuration before deploying to the AWS account:

• sudo npm run build && serverless offline start

8. Deployment in AWS:

Generate the build and deploy the serverless project in AWS:

• sudo serverless deploy

Verify the correct Serverless deployment in AWS of the Service:

should display the endpoints and lambda functions generated from the code for consumption.

9. Test Services:

Test the operation of the services that allow us to consume endpoints, such as Postman or another tool of your choice, Create .json to be consumed by a POST of the lambda function:

Verify through GET that the information is being stored in DynamoDB by requesting:

In this case, the serverless service is working correctly through the endpoint delivered by the deployment to AWS.


Review of the services used for deployment in the AWS console:

10. Remove the serverless project from AWS:

• sudo serverless remove

I hope I have given you a hand if you have doubts write me. successes! ⭐️ From @Diego Márquez