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Using a Suitelet to build a JSON object and return (for backed calling). However, just came across an instance where the JSON object is then followed up by an html comment with NS version and account info (like you would see if you open any other in the UI and view source. . .The footer)

Any ideas why this occurs? I have only seen it in one instance of calling this Suitelet but can successfully call the suitelet in other contexts without issue. (I know I'm being vague but not sure detail if needed on the mechanics of the SL itself)

<@UHP0BBX54> This happens when NS detects certain keywords or patterns in the response. I know adding &lt;html&gt;&lt;/html&gt; anywhere in the response will cause it. If you set the Content-Type header to application/json prior to writing your response, it will resolve this issue. See my comment to michoel's post below for a code sample.