Reading an JSON file from S3 using Python boto3

Question

I kept following JSON in S3 bucket \'test\'

{
  \'Details\' : \"Something\" 
}

I am using following code to read this JSON and printing the

Answer 1

I was stuck for a bit as the decoding didn't work for me (s3 objects are gzipped).

Found this discussion which helped me: Python gzip: is there a way to decompress from a string?

import boto3
import zlib

key = event["Records"][0]["s3"]["object"]["key"]
bucket_name = event["Records"][0]["s3"]["bucket"]["name"]

s3_object = S3_RESOURCE.Object(bucket_name, key).get()['Body'].read()

jsonData = zlib.decompress(s3_object, 16+zlib.MAX_WBITS)

If youprint jsonData, you'll see your desired JSON file! If you are running test in AWS itself, be sure to check CloudWatch logs as in lambda it wont output full JSON file if its too long.