如何使用 Javascript 删除 AWS S3上的对象？

You can use the JS method from S3:

var AWS = require('aws-sdk');


AWS.config.loadFromPath('./credentials-ehl.json');


var s3 = new AWS.S3();
var params = {  Bucket: 'your bucket', Key: 'your object' };


s3.deleteObject(params, function(err, data) {
if (err) console.log(err, err.stack);  // error
else     console.log();                 // deleted
});

Be aware that S3 never returns the object if it has been deleted. You have to check it before or after with getobject, headobject, waitfor, etc

You can use construction like this:

var params = {
Bucket: 'yourBucketName',
Key: 'fileName'
/*
where value for 'Key' equals 'pathName1/pathName2/.../pathNameN/fileName.ext'
- full path name to your file without '/' at the beginning
*/
};


s3.deleteObject(params, function(err, data) {
if (err) console.log(err, err.stack); // an error occurred
else     console.log(data);           // successful response
});

And don't forget to wrap it to the Promise.

You can use deleteObjects API to delete multiple objects at once instead of calling API for each key to delete. Helps save time and network bandwidth.

You can do following-

var deleteParam = {
Bucket: 'bucket-name',
Delete: {
Objects: [
{Key: 'a.txt'},
{Key: 'b.txt'},
{Key: 'c.txt'}
]
}
};
s3.deleteObjects(deleteParam, function(err, data) {
if (err) console.log(err, err.stack);
else console.log('delete', data);
});

For reference see - https://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/S3.html#deleteObjects-property

Before deleting the file you have to check the 1) file whether it is in the bucket because If the file is not available in the bucket and using deleteObject API this doesn't throw any error 2)CORS Configuration of the bucket. By using headObject API gives the file status in the bucket.

AWS.config.update({
accessKeyId: "*****",
secretAccessKey: "****",
region: region,
version: "****"
});
const s3 = new AWS.S3();


const params = {
Bucket: s3BucketName,
Key: "filename" //if any sub folder-> path/of/the/folder.ext
}
try {
await s3.headObject(params).promise()
console.log("File Found in S3")
try {
await s3.deleteObject(params).promise()
console.log("file deleted Successfully")
}
catch (err) {
console.log("ERROR in file Deleting : " + JSON.stringify(err))
}
} catch (err) {
console.log("File not Found ERROR : " + err.code)
}

As params are constant, the best way to use it with const. If the file is not found in the s3 it throws the error NotFound : null.

If you want to apply any operations in the bucket, you have to change the permissions of CORS Configuration in the respective bucket in the AWS. For changing permissions Bucket->permission->CORS Configuration and Add this code.

<CORSConfiguration>
<CORSRule>
<AllowedOrigin>*</AllowedOrigin>
<AllowedMethod>PUT</AllowedMethod>
<AllowedMethod>POST</AllowedMethod>
<AllowedMethod>DELETE</AllowedMethod>
<AllowedMethod>GET</AllowedMethod>
<AllowedMethod>HEAD</AllowedMethod>
<AllowedHeader>*</AllowedHeader>
</CORSRule>
</CORSConfiguration>

for more information about CROS Configuration : https://docs.aws.amazon.com/AmazonS3/latest/dev/cors.html

You can follow this GitHub gist link https://gist.github.com/jeonghwan-kim/9597478.

delete-aws-s3.js:

var aws = require('aws-sdk');
var BUCKET = 'node-sdk-sample-7271';
aws.config.loadFromPath(require('path').join(__dirname, './aws-config.json'));
var s3 = new aws.S3();


var params = {
Bucket: 'node-sdk-sample-7271',
Delete: { // required
Objects: [ // required
{
Key: 'foo.jpg' // required
},
{
Key: 'sample-image--10.jpg'
}
],
},
};


s3.deleteObjects(params, function(err, data) {
if (err) console.log(err, err.stack); // an error occurred
else     console.log(data);           // successful response
});

Very straight forward

At first, create an instance of s3 and configure it with credentials

const S3 = require('aws-sdk').S3;


const s3 = new S3({
accessKeyId: process.env.AWS_ACCESS_KEY_ID,
secretAccessKey: process.env.AWS_SECRET_ACCESS_KEY,
region: process.env.AWS_REGION
});

Afterward, follow the docs

var params = {
Bucket: "ExampleBucket",
Key: "HappyFace.jpg"
};
s3.deleteObject(params, function(err, data) {
if (err) console.log(err, err.stack); // an error occurred
else     console.log(data);           // successful response
/*
data = {
}
*/
});