Unable to unmarshal input: Expecting value: line 1 column 1 (char 0)

[cadeath]

Hello Guys,

I just want to ask on how to test my Lambda function with an json input?

When I tested it without parameter (json input)
docker run --rm -v %cd%:/var/task lambci/lambda:python3.6

it succeed

but when these commands

docker run --rm -v %cd%:/var/task lambci/lambda:python3.6 {"msg":"hello"}
docker run --rm -v %cd%:/var/task lambci/lambda:python3.6 '{"msg":"hello"}'

output
{"errorMessage": "Bad handler ''{msg:hello}''"}

and this
docker run --rm -v %cd%:/var/task lambci/lambda:python3.6 lambda_function.lambda_handler '{"msg":"hello"}'

output
{"errorMessage": "Expecting value: line 1 column 1 (char 0)", "errorType": "JSONDecodeError", "stackTrace": [["/var/lang/lib/python3.6/json/__init__.py", 354, "loads", "return _default_decoder.decode(s)"], ["/var/lang/lib/python3.6/json/decoder.py", 339, "decode", "obj, end = self.raw_decode(s, idx=_w(s, 0).end())"], ["/var/lang/lib/python3.6/json/decoder.py", 357, "raw_decode", "raise JSONDecodeError(\"Expecting value\", s, err.value) from None"]]}

My codes are

import os
import sys

import logging
logger = logging.getLogger()
logger.setLevel(logging.INFO)

def lambda_handler(event, context):
    context.log('Hello!')
    context.log('Hmmm, does not add newlines in 3.7?')
    context.log('\n')
    print("This is from Print Command")
    logger.info("This is INFO")
    
    return "done"

Windows 10
Docker 2.1.0.1 (37199)

[mhart]

If you're not using a bash shell (I see you're on Windows) then you'll need to escape those characters correctly: https://stackoverflow.com/a/15262019/58173

Try "{}" first just to verify, then try "{"""msg""":"""hello"""}"

[cadeath]

Thank you for the reply...

No luck

docker run --rm -v %cd%:/var/task lambci/lambda:python3.6 test.request """{"""hello""":"""world"""}"""

docker run --rm -v %cd%:/var/task lambci/lambda:python3.6 test.request """"{""""hello"""":""""world""""}""""

Output
json.decoder.JSONDecodeError: Extra data: line 1 column 4 (char 3)

[cadeath]

for testing, I used {}

and the output was

START RequestId: 2648bcd9-08c6-4436-a2e5-e85bf2ff9abc Version: $LATEST
Hello!
Hmmm, does not add newlines in 3.7?


This is from Print Command
[INFO]  2019-09-01T12:55:11.388Z        2648bcd9-08c6-4436-a2e5-e85bf2ff9abc    This is INFO

END RequestId: 2648bcd9-08c6-4436-a2e5-e85bf2ff9abc
REPORT RequestId: 2648bcd9-08c6-4436-a2e5-e85bf2ff9abc Duration: 10 ms Billed Duration: 100 ms Memory Size: 1536 MB Max Memory Used: 19 MB

"done"

[mhart]

Hi @cadeath did you figure out how to escape quotes correctly in the end?

[mhart]

Closing due to lack of activity – this is just an issue with ppl figuring out command line usage in Windows, nothing to do with this repository.

[cadeath]

Hello,

Sorry for being in active for a while, I just tried an alternative.
However, this matter was solved.

"{"""some""":"""event"""}"`

[abasu0713]

I had the same trouble..

Try this:
'{"msg":"hello"}'

[dsivakumar]

I was tryin use this https://github.com/philschmid/serverless-bert-huggingface-aws-lambda-docker, got same error.
example {"body": {''context":"some blah blah", "question": "some question?"}}
uses body = json.loads(event['body']) to load
using context.log(), able to figure out the error logged this error TypeError('the JSON object must be str, bytes or bytearray, not dict').
The data already goes as a dict, so it fails on json.loads(). changed the code to

body = event['body']

works fine!
So, using context.log() and checking on docker logs screen helped!