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Invoice-RestMethodwhich already handles JSON for you (unlikeInvoke-WebRequest) and once by another manual call toConvertFrom-Json?Acceptheader was sent), and maybe you additionally callJsonSerializer.Serializeand encode it a second time...JsonSerializer.serializeon it, turning it into a string. Then you return it, and ASP.NET JSON-encodes your string, resulting in a double-encoded object string.Invoke-RestMethodreceives that string and decodes it, resulting in the original once-encoded string representation of the object, and you then callConvertFrom-Jsonto resolve that second layer of encoding, getting back the original object.I'm definitely not calling a 2nd Serialize<< from your perspective it'd be the 1st - which is apparent from your stating that it isreturning a string already! It is returning it to ASP.NET which will nicely encode it for you to send your value as JSON... Which already was JSON before, since you serialized it manually (unnecessarily). That's what I thinkInvoke-RestMethodauto-decodes for you. So no need to manually encode or decode anything, otherwise it ends up getting encoded twice, which seems to be what happened here. You can just return an object. - I'm pretty convinced now that this is what's going on, so I'll turn it into an answer