Upload multipart/form-data to S3 from lambda (Nodejs)

Question

I want to upload multipart/form-data file to S3 using Nodejs.

I have tried various approaches but none of them are working. I was able to write content to S3 from lambda but when the file is downloaded from S3, it was corrupted.

Can someone provide me a working example or steps that could help me?

Thanking you in anticipation.

Please suggest another alternative if you think so.

Following is my lambda code:

export const uploadFile = async event => {
  const parser = require("lambda-multipart-parser");
  const result = await parser.parse(event);
  const { content, filename, contentType } = result.files[0];
  const params = {
    Bucket: "name-of-the-bucket",
    Key: filename,
    Body: content,
    ContentDisposition: `attachment; filename="${filename}";`,
    ContentType: contentType,
    ACL: "public-read"
  };

  const res = await s3.upload(params).promise();
  return {
        statusCode: 200,
        body: JSON.stringify({
            docUrl: res.Location
        })
    };
}

I've faced a similar issue, ultimately, your best bet would probably changed the file to Base64 string and send over to Lambda and convert it back to file before you upload to S3. Read more here: medium.com/@olotintemitope/… — xion
– xion, Commented Jan 25, 2020 at 2:18
I need a file upload for various file types. png, jpg, pdf, doc,docx, .xls, csv and so on. — Kedar Shinde
– Kedar Shinde, Commented Jan 25, 2020 at 5:49

varad_s · Accepted Answer · 2020-07-09 16:16:29Z

8

If want to upload file through lambda, one way is to open your AWS API Gateway console.

Go to

"API" -> {YourAPI} -> "Settings"

There you will find "Binary Media Types" section.

Add following media type:

multipart/form-data

Save your changes.

Then Go to "Resources" -> "proxy method"(eg. "ANY") -> "Method Request" -> "HTTP Request Headers" and add following headers "Content-Type", "Accept".

Finally deploy your api.

For more info visit: https://docs.aws.amazon.com/apigateway/latest/developerguide/api-gateway-payload-encodings-configure-with-console.html

edited Jul 9, 2020 at 16:16

answered Jul 9, 2020 at 16:09

varad_s

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1 Comment

courtyen Over a year ago

Oof. This. I forgot to hit "Deploy API" after modifying the Resources and Binary Media Types.. ugh.

nickolay.laptev · Accepted Answer · 2020-01-27 07:44:52Z

1

There are 2 possible points of failure - Lambda receives corrupted data or you corrupt data while sending it to S3.

Sending multipart/form-data content to Lambda is not straightforward. You can see how to do that here.
After you did this and you're sure your data is correct in Lambda, check if you send it to S3 correctly (see S3 docs and examples for that).

answered Jan 27, 2020 at 7:44

nickolay.laptev

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2 Comments

Kedar Shinde Over a year ago

There are two things. One I need to setup Binary Media Types on AWS gateway. and second parser.

Mayur Sonawane Over a year ago

@KedarShinde can you tell me more about parser

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