Nodejs AWS SDK S3 Generate Presigned URL

Solution 1:

Dustin,

Your code is correct, double check following:

1. Your bucket access policy.

2. Your bucket permission via your API key.

3. Your API key and secret.

4. Your bucket name and key.

Solution 2:

Since this question is very popular and the most popular answer is saying your code is correct, but there is a bit of problem in the code which might lead a frustrating problem. So, here is a working code

    AWS.config.update({ 
        accessKeyId: ':)))',
        secretAccessKey: ':DDDD',
        region: 'ap-south-1',
        signatureVersion: 'v4'
    });

    const s3 = new AWS.S3()
    const myBucket = ':)))))'
    const myKey = ':DDDDDD'
    const signedUrlExpireSeconds = 60 * 5

    const url = s3.getSignedUrl('getObject', {
        Bucket: myBucket,
        Key: myKey,
        Expires: signedUrlExpireSeconds
    });

    console.log(url);

The noticeable difference is the s3 object is created after the config update, without this the config is not effective and the generated url doesn't work.

Solution 3:

Here is the complete code for generating pre-signed (put-object) URL for any type of file in S3.

• If you want you can include expiration time using Expire parameter in parameter.
• The below code will upload any type of file like excel(xlsx, pdf, jpeg)

    const AWS = require('aws-sdk');
    const fs = require('fs');
    const axios = require('axios');
    const s3 = new AWS.S3();
    const filePath = 'C:/Users/XXXXXX/Downloads/invoice.pdf';
    
    
    var params = {
        Bucket: 'testing-presigned-url-dev',
        Key: 'dummy.pdf',
        "ContentType": "application/octet-stream"
    };
    
    
    s3.getSignedUrl('putObject', params, function (err, url) {
        console.log('The URL is', url);
    
        fs.writeFileSync("./url.txt", url);
    
    
        axios({
            method: "put",
            url,
            data: fs.readFileSync(filePath),
            headers: {
                "Content-Type": "application/octet-stream"
            }
        })
            .then((result) => {
                console.log('result', result);
    
            }).catch((err) => {
                console.log('err', err);
    
            });
    
    });

Solution 4:

I had a use case where using node.js ; I wanted to get object from s3 and download it to some temp location and then give it as attachment to third-party service! This is how i broke the code:

1. get signed url from s3
2. make rest call to get object
3. write that into local location

It may help anyone; if there is same use case; chekout below link; https://medium.com/@prateekgawarle183/fetch-file-from-aws-s3-using-pre-signed-url-and-store-it-into-local-system-879194bfdcf4