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I had a requirement where I needed to send a message to a web API that only accepted messages as JSON.

BizTalk2013 provides a WCF-WebHttp adaptor for sending sending XML messages to a REST endpoint but not in JSON format. There are rumours this will be remedied in BizTalk2013R2, unfortunately I required a solution now.

So in the meantime I will use the the Json.NET component to convert the XML message to JSON. I also found this blog from to convert XML messages to JSON using the in a custom pipeline component which I ended up using with some mods.

When using this pipeline remember to set the Outbound HTTP Headers as shown below:

This all worked a treat until during the unit testing phase I created a sample XML document with only one repeating element.This caused the following error from the Web API.

Can not deserialize instance…

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