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

The following worked for me.

# read_s3.py
import boto3
BUCKET = 'MY_S3_BUCKET_NAME'
FILE_TO_READ = 'FOLDER_PATH/my_file.json'
client = boto3.client('s3',
                       aws_access_key_id='MY_AWS_KEY_ID',
                       aws_secret_access_key='MY_AWS_SECRET_ACCESS_KEY'
                     )
result = client.get_object(Bucket=BUCKET, Key=FILE_TO_READ) 
text = result["Body"].read().decode()
print(text['Details']) # Use your desired JSON Key for your value 

It is not good idea to hard code the AWS Id & Secret Keys directly. For best practices, you can consider either of the followings:

(1) Read your AWS credentials from a json file stored in your local storage:

import json
credentials = json.load(open('aws_cred.json'))
client = boto3.client('s3',
                       aws_access_key_id=credentials['MY_AWS_KEY_ID'],
                       aws_secret_access_key=credentials['MY_AWS_SECRET_ACCESS_KEY']
                     )

(2) Read from your environment variable (my preferred option for deployment):

import os
client = boto3.client('s3',
                       aws_access_key_id=os.environ['MY_AWS_KEY_ID'],
                       aws_secret_access_key=os.environ['MY_AWS_SECRET_ACCESS_KEY']
                     )

Let's prepare a shell script (set_env.sh) for setting the environment variables and add our python script (read_s3.py) as follows:

# set_env.sh
export MY_AWS_KEY_ID='YOUR_AWS_ACCESS_KEY_ID'
export MY_AWS_SECRET_ACCESS_KEY='YOUR_AWS_SECRET_ACCESS_KEY'
# execute the python file containing your code as stated above that reads from s3
python read_s3.py # will execute the python script to read from s3

Now execute the shell script in a terminal as follows:

sh set_env.sh