object exists in AWS S3 bucket in Node.JS

Question

I need to check an object before creating a signed url. I need to use custom Expires. I am using following code.

var AWS = require('aws-sdk');
AWS.config.update({accessKeyId: 'YOURKEY', secretAccessKey:'YOURSECRET'});
var s3 = new AWS.S3()
params = {Bucket:'BUCKET_NAME', Key: 'TEST.pdf', Expires: 10000} 

s3.headObject(params, function(err, data) {
    if (err) console.log(err,err.code); // an error occurred
    else     
    {   
      s3.getSignedUrl('getObject', params, function (err, url) {
      if (err) {
         console.log('error: ' + err); 
      } else {
           console.log('Signed URL: ' + url);
      }
      });  
    }           // successful response
});

I am getting following error in headObject. I know headObject doesn't support Expiries.

 { [UnexpectedParameter: Unexpected key 'Expires' found in params]
  message: 'Unexpected key \'Expires\' found in params',
  code: 'UnexpectedParameter',
  time: Wed Apr 06 2016 10:14:53 GMT-0500 (CDT) }

How can i use params with custom expires in both headObject and getSignedUrl ?

Answer 1

Here's the exact code to fix your issue. This should really be self evident if you just read the error message you are getting.

var AWS = require('aws-sdk');
AWS.config.update({accessKeyId: 'YOURKEY', secretAccessKey:'YOURSECRET'});
var s3 = new AWS.S3()
headParams = {Bucket:'BUCKET_NAME', Key: 'TEST.pdf'} 
urlParams = {Bucket:'BUCKET_NAME', Key: 'TEST.pdf', Expires: 10000} 

s3.headObject(headParams, function(err, data) {
    if (err) console.log(err,err.code); // an error occurred
    else     
    {   
      s3.getSignedUrl('getObject', urlParams, function (err, url) {
      if (err) {
         console.log('error: ' + err); 
      } else {
           console.log('Signed URL: ' + url);
      }
      });  
    }           // successful response
});

Answer 2

Using V3 client

import {S3Client, HeadObjectCommand} from "@aws-sdk/client-s3";

const client = new S3Client(config);
const input = {
    Bucket: "STRING_VALUE", // required
    Key: "STRING_VALUE", // required
};
try {
    const command = new HeadObjectCommand(input);
    const response = await client.send(command);
} catch (e) {
    console.log("Object does not exist")
}

Reference : https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/clients/client-s3/classes/headobjectcommand.html