kungfoo kungfoo - 1 year ago 246
jQuery Question

Presigned AWS S3 PUT url fails to upload from client using jquery

Just started working with the node.js aws client to generate a presigned url and send it to the browser for the user to upload the file, but I get the following message:

SignatureDoesNotMatch The request signature we calculated does not
match the signature you provided. Check your key and signing method.

I have references quite a few links and it seems really basic, but I seem to be failing


Direct Browser Upload to S3 with Meteor, jQuery and the AWS SDK


Either, I am completely stupid or the sdk is really difficult to use


var putParams = {
Bucket: config.aws.s3UploadBucket,
Key: filename,
ACL: 'public-read',
Expires: 120,
Body: '',
ContentMD5: 'false'
s3.getSignedUrl('putObject', putParams, function (err, url) {
if (!!err) {
res.json({error: ''});

'awsAccessKeyId': config.aws.accessKeyId,
's3bucket': config.aws.s3UploadBucket,
's3key': filename,
's3policy': s3policy.policy,
's3signature': s3policy.signature,
'url': url


var fd = new FormData();
fd.append('file', file);
return new RSVP.Promise(function(resolve, reject) {
url: uploadObj.url,
data: fd,
processData: false,
contentType: false,
crossDomain: true,
type: 'PUT',
success: function(json, textStatus, jqXhr){
error: function(jqXhr, textStatus, errorThrown){
reject({ jqXhr: jqXhr, textStatus: textStatus, errorThrown: errorThrown});

UPDATE: In response to some of the comments, I did put in a valid CORS for the bucket.

<?xml version="1.0" encoding="UTF-8"?>
<CORSConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/">

Answer Source

I've been fighting this as well. This is what worked for me and I was getting the exact same error as you.

On the server side, I'm using AWS-SDK for nodejs

var params = {
    Bucket: "bucketname",
    Key: "filename", 
    ContentType: "multipart/form-data"
var url = s3.getSignedUrl('putObject', params, function(err, url) { 

Client Side

    method: "PUT",
    headers: {"Content-Type": "multipart/form-data"},
    processData: false,
    url: "http://AWSURL?AWSAccessKeyId..."

Your cors looks right to me, the key was ensuring that the headers for Content-Type matched exactly

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