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Reading JSON Payload from Postman to Business Central

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Posted on by CU21010025-0

Hi All,

I am facing an error when trying to post a JSON payload from POSTMAN to Business Central.

I have copied the function "ReadJSON" from https://www.dvlprlife.com/2022/12/dynamics-365-business-central-read-a-json-file-with-al/ and using the same customer payload on the page.

Please attached the screenshots.

The error being encountered is below:

{
    "error": {
        "code": "BadRequest",
        "message": "The parameter 'Customer' in the request payload is not a valid parameter for the operation 'ExperimentsAPI_ReadJSON'.  CorrelationId:  49c0c920-0585-4dc6-9fe2-6bdddb2db9e7."
    }
}

Can anyone please advise or help. Thank you.

Regards,

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Dynamics 365 Business Central

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Bilal Haider 485 on at

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Hi,

Your procedure is expecting a string named JsonObjectText but you are sending with the name "Customer" in the payload.

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Khushbu Rajvi. 22,424 Super User 2026 Season 1 on at

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Hope this helps: https://community.dynamics.com/forums/thread/details/?threadid=2c8d6f63-c0a5-ef11-8a69-7c1e5259f813

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Gerardo Rentería Ga... 26,790 Most Valuable Professional on at

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Hi, good day
I hope this can help you, and give you some hints.

Codeunit API’s in Business Central – Kauffmann @ Dynamics 365 Business Central

Best Regards
Gerardo

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Khushbu Rajvi. 22,424 Super User 2026 Season 1 on at

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This will help you : https://www.youtube.com/watch?v=rmzit3E6SJ4

https://businesscentralgeek.com/json-full-guide-in-business-central#google_vignette

https://vld-nav.com/nyt-api-integration-to-bc

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CU21010025-0 30 on at

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Thank you very much all. Issue has been solved. As Bilal pinpointed, it was due to the variable name being wrong on the function.

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CU04022109-0 4 on at

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you mentioned that it was due to the variable name which being wrong on the function.

can you please share your corrected code? i a still having the following error:

{

  "error": {

  "code": "BadRequest",

  "message": "The parameter 'Customer' in the request payload is not a valid parameter for the operation 'ExperimentsAPI_ReadJSON'. CorrelationId: 49c0c920-0585-4dc6-9fe2-6bdddb2db9e7."

}

}

Thank you

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freskito365 8 on at

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In my case the issue was because the parameter of the procedure had to be lowercase (or at least first character)

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YUN ZHU 100,974 Super User 2026 Season 1 on at

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Hi, hope the following helps as well.

Dynamics 365 Business Central: Using OData V4 unbound action (Codeunit API?) to communicate and exchange data seamlessly

https://yzhums.com/60916/

Thanks.

ZHU

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OussamaSabbouh 16,074 Super User 2026 Season 1 on at

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Hello AN,

Your OData action doesn’t have a parameter called Customer. In your AL screenshot the procedure is ReadJSON(JsonObjectText: Text), so the only valid payload parameter name is JsonObjectText (and it’s a Text parameter, not a JSON object). That’s why BC replies: “parameter 'Customer' … is not valid”. Fix it by either (a) send the JSON as a string in that parameter, e.g. {"JsonObjectText":"{ \"Customer\": { \"No\": \"10000\", ... } }"} (quotes escaped), or (b) change the action signature to accept the fields you want as separate simple parameters (or better: build a proper API page for Customer and POST to it). The dvlprlife example reads JSON from Text, so Postman must wrap it exactly the same way.

Regards,
Oussama Sabbouh

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