JSON Payload, AWS Lambda (Python), API Gateway

Question

I am receiving a payload via API Gateway to my Lambda function.

{
"resource": "/onfleet-webhook-production",
"path": "/onfleet-webhook-production",
"httpMethod": "POST",
"headers": {
    "accept": "application/json",
    "content-type": "application/json",
    "Host": "fje4zhwf83.execute1-api.us-east-1.amazonaws.com",
    "X-Amzn-Trace-Id": "Root=1-60884247-298cc6854b722b00668b0553",
    "X-Forwarded-For": "54.84.188.171",
    "X-Forwarded-Port": "443",
    "X-Forwarded-Proto": "https",
    "X-Onfleet-Signature": "539370210b482cbb4f7d728ecb33a690c89ff70dc574475000788d0fedfdd25471a45e909f42a951d8ccbb53c22ab0a548f3c7a7fa965b697ab13544c92ff08b"
},
"multiValueHeaders": {
    "accept": ["application/json"],
    "content-type": ["application/json"],
    "Host": ["fje4zhwf83.execute-api.us-east-1.amazonaws.com"],
    "X-Amzn-Trace-Id": ["Root=1-60884247-298cc6854b722b00668b0553"],
    "X-Forwarded-For": ["54.84.188.171"],
    "X-Forwarded-Port": ["443"],
    "X-Forwarded-Proto": ["https"],
    "X-Onfleet-Signature": ["539370210b482cbb4f7d728ecb33a690c89ff70dc574475000788d0fedfdd25471a45e909f42a951d8ccbb53c22ab0a548f3c7a7fa965b697ab13544c92ff08b"]
},
"queryStringParameters": null,
"multiValueQueryStringParameters": null,
"pathParameters": null,
"stageVariables": null,
"requestContext": {
    "resourceId": "0xos2v",
    "resourcePath": "/onfleet-webhook-production",
    "httpMethod": "POST",
    "extendedRequestId": "ec9LLEw0oAMFkwA=",
    "requestTime": "27/Apr/2021:16:56:39 +0000",
    "path": "/default/onfleet-webhook-production",
    "accountId": "406135884221",
    "protocol": "HTTP/1.1",
    "stage": "default",
    "domainPrefix": "fje4zhwf83",
    "requestTimeEpoch": 1619542599421,
    "requestId": "9485a44a-44f7-436c-9e98-0cb7d9034513",
    "identity": {
        "cognitoIdentityPoolId": null,
        "accountId": null,
        "cognitoIdentityId": null,
        "caller": null,
        "sourceIp": "54.84.188.171",
        "principalOrgId": null,
        "accessKey": null,
        "cognitoAuthenticationType": null,
        "cognitoAuthenticationProvider": null,
        "userArn": null,
        "userAgent": null,
        "user": null
    },
    "domainName": "fje4zhwf83.execut1e-api.us-east-1.amazonaws.com",
    "apiId": "fje4zhwf83"
},
"body": "{\"taskId\":\"f7XbmRxXvfntB086PseFXpZ9\",\"actionContext\":{\"type\":\"WORKER\",\"id\":\"C~s63JVCJTtD12J4BCY2Y4cN\"},\"triggerId\":0,\"triggerName\":\"taskStarted\",\"workerId\":\"C~s63JVCJTtD12J4BCY2Y4cN\",\"adminId\":null,\"data\":{\"task\":{\"id\":\"f7XbmRxXvfntB086PseFXpZ9\",\"timeCreated\":1619535291000,\"timeLastModified\":1619535394486,\"organization\":\"hFz5MmFqcMoMwjYmvvPbBo5U\",\"shortId\":\"4334535c\",\"trackingURL\":\"https://onf.lt/4334535c0c\",\"worker\":\"C~s63JVCJTtD12J4BCY2Y4cN\",\"merchant\":\"hFz5MmFqcMoMwjYmvvPbBo5U\",\"executor\":\"hFz5MmFqcMoMwjYmvvPbBo5U\",\"creator\":\"YG5INuyrKz4dggsW7Vo0q*Nv\",\"dependencies\":[],\"state\":2,\"completeAfter\":null,\"completeBefore\":null,\"pickupTask\":false,\"notes\":\"\",\"completionDetails\":{\"failureNotes\":\"\",\"failureReason\":\"NONE\",\"events\":[],\"actions\":[],\"time\":null,\"firstLocation\":[],\"lastLocation\":[],\"unavailableAttachments\":[]},\"feedback\":[],\"metadata\":[],\"overrides\":{},\"quantity\":0,\"serviceTime\":0,\"identity\":{\"failedScanCount\":0,\"checksum\":null},\"appearance\":{\"triangleColor\":null},\"container\":{\"type\":\"WORKER\",\"worker\":\"C~s63JVCJTtD12J4BCY2Y4cN\"},\"trackingViewed\":false,\"estimatedCompletionTime\":null,\"estimatedArrivalTime\":null,\"destination\":{\"id\":\"yIDUKM65Ck8bwNEP8z4W42Ea\",\"timeCreated\":1619535291000,\"timeLastModified\":1619535291451,\"location\":[-71.25429253636486,42.244868727926736],\"address\":{\"apartment\":\"\",\"state\":\"Massachusetts\",\"postalCode\":\"02030\",\"number\":\"35\",\"street\":\"Strawberry Hill Street\",\"city\":\"Dover\",\"country\":\"United States\"},\"notes\":\"\",\"metadata\":[],\"googlePlaceId\":null,\"warnings\":[]},\"recipients\":[{\"id\":\"5DoYN3*udPr8eUuEELGPq6yk\",\"timeCreated\":1571336170000,\"timeLastModified\":1619535291465,\"name\":\"s Test\",\"phone\":\"+16378343616\",\"notes\":\"Testing Email\",\"organization\":\"hFz5MmFqcMoMwjYmvvPbBo5U\",\"skipSMSNotifications\":false,\"metadata\":[]}]}},\"time\":1619535394615}",
"isBase64Encoded": false

}

I can access the values within this JSON; ex . data = event.get('path')

however, i can not acess to any of the variables inside the 'body'

`event.get('body')` doesn't seem to work at all

how can I access the values within the body like 'taskId', 'timeCreated" etc..

I have tried different things like json.loads(event). but they all end up with the same outcome.

Marcin · Accepted Answer · 2021-05-01 09:57:40Z

1

Your body is a string. You have to use ast parse it to valid python map:

import ast

body = ast.literal_eval(event['body'])

then you should be able to use body as regular map.

Alternative

import json

body = json.loads("{}".format(event['body']))

edited May 1, 2021 at 9:57

answered May 1, 2021 at 1:34

Marcin

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4 Comments

AAA Over a year ago

Thank you for the response. Unfortunately, I am now receiving this error; ValueError: malformed node or string: <ast.Name object at 0x0000019FA90F1C10>

Marcin Over a year ago

@AAA What generated the body? Is it AWS service, or some third party app?

AAA Over a year ago

It is a 3rd party tool called OnFleet generates the payload, and it calls our web hook at AWS ( API Gateway then our Lambda (Python) function.

Marcin Over a year ago

@AAA I provided alternative. Can you please check it?

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