How do I iterate data set result with javascripit

Migrateduser

<p>Hi, my birt report is querying our database table but there's one column which is json data. So I need to get each value of that column, parse the json data and then display on report by columns instead of displaying the json data directly on the report.  What's the best way to do it ? I'm thinking about iterating the data set and get each cell value of the json column, parse it, then reconstruct the report. All done in javascript.  But how do I iterate my dataset  ?</p>