How to (PUT) upload files to S3 with Typescript and Axios

Situation

You want to upload a file to S3 with Axios and the PUT method.

Challenge

S3 needs a Content-Length for PUT requests, otherwise it throws an 501.

Solution

Upload the file as a stream and pass the size as header.

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await axios.put(s3_upload_url, fs.createReadStream(filename), {
  headers: {
    'Content-length': fs.statSync(filename).size,
  }
});

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