Print the JSON value from AWS S3 bucket in Lambda function

Question

What is the way to get the response body of the uploaded JSON file to the lambda function to print it? I used the following code but it is specified for Content Type. Any suggestions for this please?

// console.log('Loading function');
        
const aws = require('aws-sdk');

const s3 = new aws.S3({ apiVersion: '2006-03-01' });
    
    

exports.handler = async (event, context) => {
        
        //console.log('Received event:', JSON.stringify(event, null, 2));
    
        // Get the object from the event and show its content type
        const bucket = event.Records[0].s3.bucket.name;
        const key = decodeURIComponent(event.Records[0].s3.object.key.replace(/\+/g, ' '));
        
        const params = {
            Bucket: bucket,
            Key: key,
        };
        
        try {
            const { ContentType } = await s3.getObject(params).promise();
            console.log('CONTENT TYPE:', ContentType);
            console.log('Body: ', );
            
            console.log("response: " + "I want to print the response body here when a JSON file uploaded")
            
            return ContentType;
        } catch (err) {
            console.log(err);
            const message = `Error getting object ${key} from bucket ${bucket}. Error : ` + err;
            console.log(message);
            throw new Error(message);
        }
    };

Mehmet Güngören · Accepted Answer · 2023-01-18 06:54:40Z

1

return value of getObject contains Body field.

const { ContentType, Body } = await s3.getObject(params).promise();
console.log('CONTENT TYPE:', ContentType);
console.log('Body: ', Body);

answered Jan 18, 2023 at 6:54

Mehmet Güngören

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2 Comments

terry_alex_97 Over a year ago

Thanks this is working with SDK Version 2 well. But when we use NodeJs V18+ it uses SDK 3 and getting the bucket name and key is a trouble with it.

terry_alex_97 Over a year ago

const bucket = event.Records[0].s3Client.bucket.name; const key = decodeURIComponent(event.Records[0].s3Client.object.key.replace(/\+/g, ' ')); these methods are not support with SDK 3 I guess

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