display ajax response in form input box

Hi

I have got this json array from controller

{"plan_id":"7","plan_title":"GOLD","plan_price":"999","resume_limit":"12000","day_limit":"364","job_limit":"20","user":"1","day_break":"0"}


Now i want to display the values in the forms input 

I try this but it does not display the plan_price (999) in the input field

document.getElementById("plan_price").value = data.plan_price; 

Please help

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