Deploy React App with AWS S3, DynamoDB, and Lambda

This guide explains how to deploy a React app using S3 for hosting, DynamoDB for database, and Lambda + API Gateway for backend API.

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1. Clone Project

git clone <this-repo-url>
cd <project-folder>

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2. Run Project Locally

npm install
npm start

Verify it runs successfully at http://localhost:3000.

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3. Create S3 Bucket

1. Go to AWS Console → S3 → Create Bucket
2. Enter a unique bucket name
3. Unselect Block all public access
4. Select I acknowledge... warning
5. Click Create bucket

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4. Enable Static Website Hosting

1. Open your bucket

2. Go to Properties

3. Scroll to Static website hosting → Enable

4. Enter:

   • Index document: index.html

5. Save changes

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5. Upload Build to S3

Build the React project:

npm run build

Sync build folder to S3: . make sure your terminal is at your current folder path

aws s3 sync build/ s3://<your-bucket-name>

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6. Create DynamoDB Table

1. Go to AWS Console → DynamoDB → Create table

2. Enter:

   • Table name: yourtable
   • Partition key: id (Number)

3. After table creation → click Create item and paste:

{
  "id": { "N": "102" },
  "age": { "N": "100" },
  "email": { "S": "yourname@example.com" },
  "name": { "S": "My Name" },
  "phone": { "N": "03001234567" },
  "salary": { "N": "0" }
}

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7. Create AWS Lambda Function

1. Go to AWS Console → Lambda → Create Function

2. Select:

   • Runtime: Node.js
   • Function name: GetUsers

3. Paste code:

import { DynamoDBClient } from "@aws-sdk/client-dynamodb";
import { ScanCommand, DynamoDBDocumentClient } from "@aws-sdk/lib-dynamodb";

const client = new DynamoDBClient({ region: "us-east-1" });
const docClient = DynamoDBDocumentClient.from(client);

const params = {
    TableName: "yourtable"
};

async function getDynamoDBItem() {
    try {
        const data = await docClient.send(new ScanCommand(params));
        return data;
    } catch (error) {
        console.log(error);
        return error;
    }
}

export const handler = async (event, context) => {
    try {
        const data = await getDynamoDBItem();
        return { body: JSON.stringify(data) };
    } catch (error) {
        console.log(error);
        return error;
    }
};

4. Deploy and Test the function.

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8. Add API Gateway

1. Go to API Gateway → Create API
2. Create Resource and add Method → GET
3. Attach your lambda function to api gateway.
4. Enable CORS
5. Deploy API → create a new stage
6. Copy the Invoke URL

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9. Update React Code

In your React project, update src/component/user with the API_URL from API Gateway.

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10. Re-Deploy React Build

npm run build
aws s3 sync build/ s3://<your-bucket-name>

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11. Access Your Deployed App

1. Go to S3 → Your Bucket → Properties
2. Scroll to Static website hosting
3. Copy the Bucket website endpoint
4. Open it in your browser 🎉

🌐 Live Demo

You can check out the live app (hosted on AWS Free Tier) before it expires:

Live Demo