How to read JSON file using the getObject command of AWS S3 Javascript SDK?

Question

I am trying to read a JSON file stored in an S3 bucket. I am trying to get the JSON file contents using getObject command of Javascript SDK. I am getting output as [object Object] when I convert the aws response to utf8 string. This is my nodeJS code:

const s3Client = require("./aws_s3_connect");
const { GetObjectCommand } = require("@aws-sdk/client-s3");
//const storage_file_path = "";

const run = async (input_data) => {

    const bucket_name = "bucket_name";
    const file_path = "";
    const file_name = "sample.json";

    const bucketParams = {
        Bucket: bucket_name,
        Key: file_path + file_name,
        ResponseContentType: 'application/json'
    };

    try {
        // Send get object command
        let aws_response = await s3Client.send(new GetObjectCommand(bucketParams));
        console.log(aws_response);
        //var blob = new Blob(aws_response.Body);
        let data = aws_response.Body.toString('utf8');
        console.log(data);

        return data;
    } catch (err) {
        console.log("Error", err);
    }
};

module.exports = { run };

Please help me to identify the issue. Thanks for your help.

Does this answer your question? How to get response from S3 getObject in Node.js? — fedonev
– fedonev, Commented Mar 8, 2023 at 12:15
Thanks. I am able to read the json using the response you shared. — Prithivin Lakshminarayanan
– Prithivin Lakshminarayanan, Commented Mar 8, 2023 at 12:30

Mercury · Accepted Answer · 2023-12-04 07:46:59Z

5

Working example

FROM 22/08/2023 you can use the built-in function transformToString

And assuming you have a bucket and a file/object ready

import { S3Client, GetObjectCommand} from '@aws-sdk/client-s3';
const s3 = new S3Client({region: "eu-west-1"});

const params = {Bucket: "my-unique-bucket", Key: "my-s3-object"};
const res = await s3.send(new GetObjectCommand(params));
const bodyString = await res.Body.transformToString();

Reference: https://docs.aws.amazon.com/AmazonS3/latest/userguide/example_s3_GetObject_section.html

edited Dec 4, 2023 at 7:46

answered Dec 3, 2023 at 16:18

Mercury

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