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
- Create DynamoDB table awsverse-leads.
- Deploy Lambda; connect HTTP API.
- POST JSON with curl; verify item in table.
- Enable Lambda provisioned concurrency on hot path.
- 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.
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