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AWS Lambda - GeeksforGeeks

Last Updated : 06 Aug, 2025

AWS Lambda is a powerful serverless computing service that automatically runs code in response to events, without requiring you to manage the underlying infrastructure. It supports event-driven applications triggered by events such as HTTP requests, DynamoDB table updates, or state transitions.

You simply upload your code (as a .zip file or container image), and Lambda handles everything from provisioning to scaling and maintenance. It automatically scales applications based on traffic, handling server management, auto-scaling, security patching, and monitoring.

AWS lambda are server-less compute functions are fully managed by the AWS where developers can run their code without worrying about servers. AWS lambda functions will allow you to run the code with out provisioning or managing servers.

Once you upload the source code file into AWS lambda in the form of ZIP file then AWS lambda will automatically run the code without you provision the servers and also it will automatically scaling your functions up or down based on demand. AWS lambda are mostly used for the event-driven application for the data processing Amazon S3 buckets, or responding to HTTP requests.

1. Process data from Amazon S3 buckets.
2. Respond to HTTP requests.
3. Build serverless applications.

You can trigger the lambda in so many ways some of which are mentioned below.

1. File Processing: AWS lambda can be triggered by using simple storage services (S3). Whenever files are added to the S3 service Lambda data processing will be triggered.
2. Web Applications: You can combine both web applications and AWS lambda which will scale up and down automatically based on the incoming traffic.
3. IoT (Internet of Things) applications: You can trigger the AWS lambda based on certain conditions while processing the data from the device which are connected to the IOT applications. It will analyze the data which are received from the IOT application.
4. Stream Processing: Lambda functions can be integrated with the Amazon kinesis to process real-time streaming data for application tracking, log filtering, and so on.

AWS lambda will help you to focus more on your code than the underlying infrastructure. The infrastructure maintenance in AWS was taken care of by AWS lambda.

The following are the some features which are provided by the AWS (Amazon Web Services):

AutoScaling and High Availability: AWS lambda will make sure that your application was highly available to the end users when there is sudden incoming traffic. High availability can be achieved by scaling the application.

Serverless Execution: There is no need for provisioning the servers manually in AWS. AWS lambda will provision the underlying infrastructure based on the triggers you are mentioned whenever a new file uploaded to a particular then AWS lambda will automatically trigger and takes care of the infrastructure.

Pay-per-use-pricing: AWS will charge you only for the time that time compute engine was active. AWS bills you based on the time taken to execute the code.

Supports different programming languages: AWS lambda function will support different programming languages. You can build the function with the language at your convenience. Following are some languages supported by AWS lambda:

• Python
• Node.js
• Java
• C#
• PowerShell
• Go

Integrates with other AWS Services: AWS lambda can be integrated with different AWS services like the following :

• API Gateway
• DynamoDB
• S3
• Step Functions
• SNS
• SQS

Versioning and Deployment: AWS lambda function will maintain the different kinds of versions of the code by which you can change between the versions without any disruptions y based on the application performances.

Security and Identity Management: AWS lambda will leverage AWS Identity and Access Management (IAM) to control the access to the functions which are built by using lambda You can define fine-grained permissions and policies to secure your functions and ensure that only authorized entities can invoke them.

Start off by uploading the code to AWS Lambda. From there, set up the code to trigger from other AWS services, HTTP endpoints, or mobile apps. AWS Lambda will only run the code when it's triggered and will also only use the computing resources needed to run it. The user has to pay only for the compute time used.

The following are the steps mentioned below to create your own customized AWS lambda functions by using the AWS console. Create an AWS account.

Step 1: Log in to your AWS console and search for Lambda. As shown in the following image.

Step 2: Click on Create function.

Step 3: Here we are going to use a sample hello world program by using Author from scratch and configure the details according to your requirement.

Step 4: Successfully our function is created.

AWS lambda pricing is based on the no.of requests made to your function and the time it has taken to execute the function. The following are the pricing factors to be considered for AWS Lambda. As previously mentioned, with AWS Lambda user only pays for what he uses, factoring in the number of requests and duration of the execution of the code. No charges are taken for creating lambda functions. Lambda considers a request to be each time it starts executing in response to a trigger such as an event notification or an invocation volume. The duration of the code is calculated from the moment the code begins executing until it returns or is terminated. If one is unsure about whether AWS Lambda is the right choice or not, there is a free tier option available to try. This option includes 1M free requests per month and 400,000 GB-seconds of compute time per month.

1. Requests: AWS lambda charges are made up of the no.of requests made to your AWS lambda function. Each request will be counted individually based on the time duration also aws lambda will calculate all the requests made per month. The pricing will be varied from the different regions and the total no.of requests made for your function.
2. Duration: AWS lambda will be charged based on the duration of time your code started executing and till the time it is terminated. And also while executing the AWS lambda you should allocate some memory to your function this factor is also counted while billing.
3. Free requests: You have one million free requests per month which is free for all users and when coming to the duration you have 400,000 GB-seconds of compute time per month.

Monitoring your AWS Lambda usage is crucial for understanding and controlling costs, especially as your workloads scale beyond the AWS Free Tier limits. Here are some ways to effectively track and manage Lambda usage:

• CloudWatch Metrics: Track invocation counts, execution duration, error rates and memory use. You can set alarms to alert you when usage exceeds specific thresholds​.
• Cost Explorer: Visualize and analyze your spending patterns by breaking down Lambda expenses. Set budgets and alerts to manage monthly costs effectively​.
• Usage Reports: Access detailed reports in the AWS Billing Console for monthly usage across AWS services, helpful for teams needing cost allocation across functions​.
• Third-Party Tools: Use tools like Datadog, Lumigo and New Relic for advanced monitoring and insights, allowing for more detailed performance tracking and cost optimization​.

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