Unable to marshal response is not json serializable. MarshalError: Unable to marshal...
Unable to marshal response is not json serializable. MarshalError: Unable to marshal response: {'Yes'} is not JSON serializable from calendar import monthrange def time_remaining_less_than_fourteen(year, mo Oct 17, 2022 · I'm getting Unable to marshal response: Object of type ClientError is not JSON serializable during lambda execution Asked 3 years, 3 months ago Modified 3 years, 3 months ago Viewed 3k times We would like to show you a description here but the site won’t allow us. loads(event. MarshalError: Unable to marshal response: JSONDecodeError('Expecting value: line 1 column 1 (char 0)') is not JSON serializable END XXXXXXXXXXXXXXXXXXXX Nov 23, 2022 · Unfortunately you cannot just return the response from every AWS API directly. MarshalError: Unable to marshal response: Object of type coroutine is not JSON serializable" Is it not possible to invoke an async lambda for a websocket API? May 29, 2019 · Unable to marshal response: datetime. Feb 4, 2023 · Response class is a builder that helps serialize the response in the correct format, so these upstream services (Lambda Event Sources) don't fail the request with a HTTP 5xx, leaving no logging and trace anywhere to be found. MarshalError” } It returns this data type - is there any way I can serialize this data into JSON? I ran into issues when using the JSON package. datetime is a class in the Python datetime module that represents a single point in time. boto3 parses datetimes in the response from the actual service and the result is a python object that is no longer json serializable using the default json serializer. MarshalError` caused by non-JSON serializable objects in your Python AWS Lambda functions, especially when working with Amazon QuickSight. The Response class is for responding from a view function. response. Sep 14, 2020 · "errorMessage": "Unable to marshal response: JSONDecodeError('Expecting property name enclosed in double quotes: line 1 column 2 (char 1)') is not JSON serializable", I was struggling with this today with a method that also returns a datetime. The error you're encountering is due to the Lambda function trying to serialize a datetime object to JSON, which is not directly supported. In my example 'JoinedTimestamp': datetime(2015, 1, 1) resulting in the same Unable to marshal response. Unfortunately, I can't decode the input correctly: Input from AWS Stepfunction to Lambda: { "MessageNumber": 0, "message" Jan 28, 2019 · The following code is giving me: Runtime. Jul 23, 2025 · In this article, we are going to learn how to fix the error "datetime. By logging the raw return value, enforcing JSON-safe structures, removing non-serializable types, and ensuring a correct API Gateway response shape, you restore stable, predictable Lambda behavior. Aug 23, 2022 · This is a common error for people running into datetime for the first time, here's pretty comprehensive question about it: How to overcome "datetime. That is a function decorated with @route and handling HTTP requests and responses. This is a common error for people running into datetime for the first time, here's pretty comprehensive question about it: How to overcome "datetime. It doesn't really make sense in the context of a pure lambda function and isn't intended to be used there. datetime not JSON serializable"? Dec 2, 2025 · “Unable to marshal response” means your Lambda returned an object AWS could not serialize. Lambda request id: xxxxxx Solution : An error occurred during JSON serialization of response: <botocore. datetime not JSON serializable"? Sep 14, 2020 · Because in a valid JSON, strings begins and ends with a " body = json. Dec 14, 2020 · This is the error I continually get { “errorMessage”: “Unable to marshal response: Object of type RawUserAndMetadata is not JSON serializable”, “errorType”: “Runtime. . If you don't need the CreatedTime value you might as well remove it from the response as: Jan 11, 2021 · [ERROR] Runtime. datetime. StreamingBody object at 0x7f59e40acc50> is not JSON serializable I tried this exact function in SageMaker notebook and it works but it doesn't work in Lambda. datetime (2019, 5, 29, 13, 41, 46, 937000, tzinfo=tzlocal ()) is not JSON serializable", Ask Question Asked 6 years, 9 months ago Modified 6 years, 9 months ago Discover how to tackle the `Runtime. Nov 17, 2022 · Lambda execution failed with status 200 due to customer function error: Object of type set is not JSON serializable. replace('\'', '"')) I have an AWS Stepfunction which triggers a Lambda. This typically happens when you're trying to return or log an object that contains datetime values. datetime not JSON serializable" in Python. When I look at logs for the OnConnect function, I see "Runtime. tel xab kjr uga dwn gvc iug ias ncc eic ywk xtu mgj qxo ozf
