Nodejs download s3 file

In the example below, the data from S3 gets converted into a String object with toString and write to a file with writeFileSync method. Alternatively, you can create the stream reader on getObject method and pipe to a stream writer as described here. If you want to do it with Node. Here is the quick Node. Once we get the response, we will convert it to a JSON object.

For this example, we will use the old-school QAS Quick …. I used to use plug-ins to render code blocks for this blog. If I understand it correctly, you want to get the object from the s3 bucket and stream to your HTTP response as the stream.

Instead of getting the data in the buffers and than figuring out the way to convert it to stream can be complicated and has its limitations, if you really want to leverage the power of streams then don't try to convert it to buffer and load the entire object to the memory, you can create a request that streams the returned data directly to a Node.

The raw data stream can then be piped into any Node. This technique is useful for service calls that return raw data in their payload, such as calling getObject on an Amazon S3 service object to stream data directly into a file, as shown in this example.

Note: Because Node. In the event of a socket failure, while streaming, the SDK won't attempt to retry or send more data to the stream.

Your application logic needs to identify such streaming failures and handle them. Edits: After the edits on the original question, I can see that s3 sends a PassThrough stream object which is different from a FileStream in Nodejs.

So to get around the problem use the memory If your files are not very big and or you have enough memory. I have tested and this solution works. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. You had everything correct other than how you were calling the downloadFromS3 function.

I've just tidied up the code a little as you probably don't want to be updating AWS creds every time you hit the download route. Nor creating a new instance of S3 — razki. Thanks very much for the explanation! Rodnier Borrego Rodnier Borrego 19 1 1 bronze badge. Please don't post only code as answer, but also provide an explanation what your code does and how it solves the problem of the question.

Answers with an explanation are usually more helpful and of better quality, and are more likely to attract upvotes. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. A late answer but the problem is what at first glance seems as only a semantic error. Sign up for free to join this conversation on GitHub.

Already have an account? Sign in to comment. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window. Bucket : bucketName ,.