Lesson 57/100

Tutorials AWS Cloud Tutorial

Serverless APIs — Complete Guide

Serverless APIs — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of AWS Cloud Tutorial on Toolliyo Academy.

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AWS Cloud Tutorial · Lesson 57 of 100

Serverless APIs

Core services ✓Projects

Projects · 2 — Deploy · ~10 min · AWS — Serverless & Event-Driven

What is this?

Serverless APIs combine API Gateway, Lambda, DynamoDB, and Cognito without managing servers. Scale and cost track request volume.

Why should you care?

AwsVerse MVP features ship as serverless APIs to avoid idle EC2 cost between releases.

See it live — copy this example

Run in AWS CloudShell / local AWS CLI v2, or follow the matching steps in the AWS Console (Free Tier).

const { DynamoDBClient, PutItemCommand } = require('@aws-sdk/client-dynamodb');
exports.handler = async (event) => {
  const body = JSON.parse(event.body || '{}');
  await new DynamoDBClient({}).send(new PutItemCommand({
    TableName: 'awsverse-leads',
    Item: { leadId: { S: body.id }, email: { S: body.email } }
  }));
  return { statusCode: 201, body: JSON.stringify({ ok: true }) };
};

What happened?

  • Node.js Lambda handler parses API Gateway proxy event, writes lead to DynamoDB via AWS SDK v3, returns HTTP 201.
  • Follow the steps below — typing the code yourself is the fastest way to learn.

Practice next

  1. Create DynamoDB table awsverse-leads.
  2. Deploy Lambda; connect HTTP API.
  3. POST JSON with curl; verify item in table.
  4. Enable Lambda provisioned concurrency on hot path.
  5. Add request validator on API Gateway model.

Remember

API GW + Lambda + DynamoDB stack. Pay per request not idle servers. Add Cognito for user auth.

AwsVerse lead capture

Marketing landing page needs backend in one day.

Outcome: Serverless API handles launch day traffic with zero pre-provisioned servers.

Interview prep for this lesson

Practice these questions aloud after reading—each links to a full structured answer.

Junior Detailed
Explain Services in the context of AWS Cloud.
Short answer: Interviewers want a crisp definition, a practical example from your projects, and awareness of trade-offs—not textbook dumps. Explain a bit more How to structure your answer (60–90 seconds) Define Services…
Mid Detailed
What are common mistakes teams make with Deployment when using AWS Cloud?
Short answer: Interviewers want a crisp definition, a practical example from your projects, and awareness of trade-offs—not textbook dumps. Explain a bit more How to structure your answer (60–90 seconds) Define Deploymen…
Senior Detailed
How would you debug a production issue related to Security in a AWS Cloud application?
Short answer: Interviewers want a crisp definition, a practical example from your projects, and awareness of trade-offs—not textbook dumps. Explain a bit more How to structure your answer (60–90 seconds) Define Security…
Junior Detailed
Describe a real-world scenario where Monitoring mattered in a AWS Cloud project.
Short answer: Interviewers want a crisp definition, a practical example from your projects, and awareness of trade-offs—not textbook dumps. Explain a bit more How to structure your answer (60–90 seconds) Define Monitorin…
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AWS Cloud Tutorial
Course syllabus

AWS Cloud Tutorial

AWS — Foundations
AWS — Networking & Security
AWS — Compute Services
AWS — Storage & Databases
AWS — DevOps & Automation
AWS — Serverless & Event-Driven
AWS — Observability & Security
AWS — Cloud-Native & Microservices
AWS — AI, Performance & Cost
AWS — Enterprise Projects
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