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API Integration Error

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Posted on by Mamtesh

Facing API Integration.
So, I have designed an AI in katonic platform. So, when I'm integrating it in Power Automate Desktop, I'm getting error (422) and the Web Service Response is as below:
{"detail":[{"loc":["body",0],"msg":"Expecting value: line 1 column 1 (char 0)","type":"value_error.jsondecode","ctx":{"msg":"Expecting value","doc":"%7b%0d%0a%22data%22+%3a+%22Hi+support+team%2c+I%e2%80%99+am+unable+to+login+to+my+system+even+though+I+reset+my+password+promptly+as+suggested.+Please+look+into+this+issue+on+urgent+basis.Thank+you%22%0d%0a%7d","pos":0,"lineno":1,"colno":1}}]}
I'm unable to rectify this issue.
Can someone help me out in resolving this issue?

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Power Automate Desktop

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CU16071609-1 6,255 Moderator on at

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@Mamtesh

First try to invoke your webservices using postman with required values then replicate the same steps in PAD so that you will get some clue where the exact issues is.

Thanks,
Deenuji Loganathan 👩‍💻
Automation Evangelist 🤖
Follow me on LinkedIn 👥

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Riyaz_riz11 4,219 Super User 2026 Season 2 on at

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HI @Mamtesh ,

While integrating api in PAD try first with postman once working so you will idea how you can pass headers body and all, if working after you can try with PAD.

If I have answered your question, please mark it as the preferred solution. If you like my response, please give it a Thumbs Up.

Regards,
Riyaz
VishnuReddy1997 2,666 Super User 2026 Season 1 on at

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Hi @Mamtesh ,

As per my understanding i have written few steps.Please check the below.

1.Check Your JSON Syntax: The error message suggests that there might be an issue with the JSON syntax in your request. Make sure that your JSON is properly formatted and doesn’t contain any syntax errors.
2.Check Your API Endpoint: Make sure that you’re targeting the correct API endpoint. If you’re not targeting an actual API endpoint, you might be sending a request to a URL that is designed to return an HTML document.
3.Check Your Headers: The error could be due to incorrectly positioned whitespace in your headers. There shouldn’t be any whitespaces before the colo..
4.Check Your Request Body: If you’re sending a request body, make sure it’s properly formatted and matches the expected format of the AP. You might need to disable or enable the “Encode request body” option.

(Note:- if you got your solution you can mark as solution and gives kudos)

Thanks & Regards
Vishnu Reddy
AK88 453 on at

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Hi @Mamtesh ,

Kindly check the below steps to rectify :

-> Check all the required fields have been added.
-> Check user authorized to perform the requested action
-> Check whether the API is upgraded or not.
-> Kindly check with POSTMAN.

thanks,
If you like my response, please give it a Thumbs Up.
Mamtesh 6 on at

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Hello Deenujji, I have tested api in postman and its working fine.
Here are my screenshots :
I have also attached the webservice screenshot, just review it and tell me if any changes has to be done.
Mamtesh 6 on at

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Hello @Ahammad_Riyaz ,
I have tested the api in postman and its working fine.
And I think I'm missing some headers while invoking webservice, can you just help me in resolving it.
I have attached screenshots of both postman and webservice in the below:
CU16071609-1 6,255 Moderator on at

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@Mamtesh

Can you try with different text in request body in JSON format something like sample text?
Mamtesh 6 on at

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Hello @Deenuji ,
I'm still facing the same issue.