DynamoDB gzip Large Attribute Values

read.js

const AWS = require('aws-sdk');
const { gunzipSync } = require('zlib');

AWS.config.update({ region: 'eu-west-1' });
const dynamoDbClient = new AWS.DynamoDB();

dynamoDbClient.getItem({
    "TableName": "blog",
    "ReturnConsumedCapacity": "TOTAL",
    "Key": {
        "author": {
            "S": "bboure"
        },
        "slug": {
            "S": "raw-blog-post"
        },
    }
}).promise().then(result => {
    console.log('Read capacity for raw post', result.ConsumedCapacity );
});


dynamoDbClient.getItem({
    "TableName": "blog",
    "ReturnConsumedCapacity": "TOTAL",
    "Key": {
        "author": {
            "S": "bboure"
        },
        "slug": {
            "S": "compressed-blog-post"
        },
    }
}).promise().then(result => {
    console.log('Read capacity for compressed post', result.ConsumedCapacity );
    // uncompress
    const content = gunzipSync(result.Item.content.B).toString();
    console.log(`Original text with ${content.length} characters and ${content.split(' ').length} words`);
});

write.js

const AWS = require('aws-sdk');
const { loremIpsum } = require('lorem-ipsum');
const { gzipSync } = require('zlib');

const content = loremIpsum({
    count: 20,
    units: "paragraph",
    format: "plain",
    paragraphLowerBound: 5,
    paragraphUpperBound: 15,
    sentenceLowerBound: 5,
    sentenceUpperBound: 15,
    suffix: "\n\n\n",
});

console.log(`Generated a text with ${content.length} characters and ${content.split(' ').length} words`);

const compressed = gzipSync(content);
console.log(`total size (uncompressed): ~${Math.round(content.length/1024)} KB`);
console.log(`total size (compressed): ~${Math.round(compressed.length/1024)} KB`);

AWS.config.update({ region: 'eu-west-1' });
const dynamoDbClient = new AWS.DynamoDB();

dynamoDbClient.putItem({
    "TableName": "blog",
    "ReturnConsumedCapacity": "INDEXES",
    "Item": {
        "author": {
            "S": "bboure"
        },
        "slug": {
            "S": "indexed-raw-blog-post"
        },
        "timestamp": {
            "S": `${Date.now()}`,
        },
        "title": {
            "S": "My blog post"
        },
        "content": {
            "S": content,
        }
    }
}).promise().then(result => {
    console.log('Write capacity for raw post', result.ConsumedCapacity );
});


dynamoDbClient.putItem({
    "TableName": "blog",
    "ReturnConsumedCapacity": "INDEXES",
    "Item": {
        "author": {
            "S": "bboure"
        },
        "slug": {
            "S": "indexed-compressed-blog-post"
        },
        "timestamp": {
            "S": `${Date.now()}`,
        },
        "title": {
            "S": "My blog post"
        },
        "content": {
            "B": compressed,
        }
    }
}).promise().then(result => {
    console.log('Write capacity for compressed post', result.ConsumedCapacity );
});

As see on https://benoitboure.com/how-to-store-large-attribute-values-in-dynamodb