Parse SQS stringify json message Python

Question

I have a SQS queue which triggers a lambda function where as a message I pass the stringify json. I am trying to get the whole message body from the Records , but throws an error,

[ERROR] KeyError: 'efsPathIn'
Traceback (most recent call last):
  File "/var/task/lambda_function.py", line 20, in lambda_handler
    key = bodyDict['efsPathIn']

I'm sending this stringify json as a message in SQS queue,

{"Records": [{"body": "{\"efsPathIn\": \"163939.jpeg\",\"imageWidth\": \"492\",\"imageHeight\": \"640\",\"bucketOut\":\"output-bucket\",\"keyOut\":\"163939.webp\"}"}]}

And the code is which extracts the values,

for item in event['Records']:
    body = str(item['body'])
    bodyDict = json.loads(body)
    key = bodyDict['efsPathIn']
    bucket_out = bodyDict['bucketOut']
    width = bodyDict['imageWidth']
    height = bodyDict['imageHeight']
    key_out = bodyDict['keyOut']

I've tried with json.dumps(item['body']) also which further loads the json, but still getting the same error.

When I test from AWS Lambda test console using the above mentioned json message, the function gets successfully executed, but I get this error while sending a message from a SQS queue.

Answer 1

json.dumps() is for converting a Python object into a JSON string. You have a JSON string that you are need to convert into a Python object. You should be calling json.loads() like so:

body = json.loads(item['body'])

After which you will have a Python object that you can do things like: body['efsPathIn']