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Error of "Http request failed: the content was not a valid JSON." when using REST to JSON connector

Error of "Http request failed: the content was not a valid JSON." when using REST to JSON connector. The body result contains CDATA formatting, and this custom connector's action's schema property is set to "String" type, with no specific "Format". I tried a format of "Binary" as well, and the same error occurred.


Why is the Flow trying to parse the result from this action's body result's string value? Can it not just return as a normal string and not be parsed by the flow?

Super User
Super User

HI @mysticode 


Is there a way for you to share an annonimized sample of your JSON so that we can take a look?


If I have answered your question, please mark your post as Solved.
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When this returns with "Value" being blank, my custom connector Method returns without any errors:


    "statusCode": 200,
    "headers": {
        "Cache-Control": "max-age=0, private",
        "Date": "Tue, 15 Sep 2020 21:43:52 GMT",
        "X-AspNet-Version": "4.0.30319",
        "Content-Length": "447",
        "Content-Type": "application/json"
    "body": {
        "projectRespondentResponseGetResponse": {
            "projectRespondentResponseGetResult": {
                "methodname": "ProjectRespondentResponseGet",
                "result": {
                    "success": true,
                    "id": "00000000-0000-0000-0000-000000000000",
                    "value": "",
                    "errors": []
However, if "Value" returns with the actual data I want, it causes the Flow error that I mentioned originally:
<![CDATA[{"answers":[{"answercompl":"","answertext":"","detail":"","element":"First Name:","idelement":"","progid":"","rowsorter":-1,"sorter":1000008,"subdetail":""},:""}

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