add warning message for unparseable JSON in body data

scripts/generate-http-docs.ps1

@@ -238,8 +238,17 @@ function Build-RequestContent($http, $name, $config, $dotenvVars) {
     }
 
     if ($http.body) {
+        if ($http.body.type -eq 'json') {
             $lines += ""
-        $lines += ($http.body.data | ConvertTo-Json -Depth 10)
+            try {
+                $lines += ($http.body.data | ConvertFrom-Json -Depth 10 | ConvertTo-Json -Depth 10)
+            }
+            catch {
+                <#Do this if a terminating exception happens#>
+                Write-Warning "Failed to parse JSON for request $name, will use original content"
+                $lines += $http.body.data
+            }
+        }
     }
 
     return ($lines -join "`n")