You do not include the definition of the jqGrid column having the problem, nor any JSON test data. So I'm trying to tip over. I believe that you save the information in the database as logical and send the values "true" and "false" inside the JSON data. If you do not use any formatter, the data will be displayed as text. To display the data as other text, you can use the 'select' formatter :
formatter:'select', stype:'select', edittype:'select',
editoptions: { value: "false:No;true:Yes" }
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