Amazon Lex's session attributes do not allow nested object?

Question

I am trying to persist a nested object in sessionAttributes. However, it seems Amazon Lex does not recognize if I send a structure like this in response:

{
    "sessionAttributes": {
        "previousIntent": "TCAIntent",
        "prevSlots": {
            "test": 1
        }
    },
    "dialogAction": {
        "type": "Delegate",
        "slots": {
            "firstName": null,
            "lastName": null,
            "rate": null,
            "rentMortgage": null,
            "downPayment": null,
            "purchasePrice": null,
            "email": null
        }
    }
}

When I replace {"test": 1} with a value, it works fine. Is there a way around this or possible mistake?

Error:

Duy Nguyen · Answer 1 · 2017-06-14T23:28:51.353

2

I have figured out that Lex does not allow storing json object or array on sessionAttributes. As a work around, I converted the json object to string and convert it back when I need to use it.

edited Jun 14 '17 at 23:28

answered Jun 14 '17 at 17:45

Duy Nguyen

155
1
9

1

Thanks. Come across the question figuring out the same sort of problem – Greg Hornby Nov 27 '17 at 03:43
Perfect! This did not throw an error for me (at least no where I could access) and it took a week to narrow it down to this being the problem/solution. – Jay A. Little Feb 12 '18 at 10:14

Amazon Lex's session attributes do not allow nested object?

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