DynamoDB JSON formatting on AWS Lambda

Question

I am retrieving a DynamoDB item using Python and AWS Lambda. I am having difficulty parsing the value that the response contains.

For example, this is returned for response['Item']['GUID']

{u'S': u'8898f389-c282-4c4f-952a-87a0fbbb6d70'}

In the end, I just want the actual value without the extraneous information DynamoDB inserts. How do you best handle DynamoDB's JSON formatting using Python 2.7?

Eyal Ch · Accepted Answer · 2016-02-28 18:39:54Z

1

this is an example:

def lambda_handler(event, context):

        print("Received event: " + json.dumps(event, indent=2))

        if 'Records' not in event:
            print ('records not in event')
            return

        for record in event['Records']:
            if record['eventName'] == 'INSERT':
                print 'do something on insert'

            your_integer_hash_key = record['dynamodb']['Keys']['your_hash_key']['N']

            # if all image is stream
            if not 'NewImage' in record['dynamodb']:
                continue

            # get new image    
            new_image = record['dynamodb']['NewImage']

answered Feb 28, 2016 at 18:39

Eyal Ch

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1 Comment

Taylor Higley Over a year ago

The tip to use json.dumps lead me to this: dynamo_GUID = json.dumps(response['Item']['GUID']) Everything seems to work how I anticipate now.

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