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Your JSON data generated is incorrect. The right output should be
"{
"labels": ["c1","c2","c3","c4"],
"datasets": [
{
"label":"s1",
"fillColor":"rgba(220,220,220,0.5)",
"highlightFill":"rgba(220,220,220,0.75)",
"highlightStroke":"rgba(220,220,220,1)",
"strokeColor":"rgba(220,220,220,0.8)",
"data":[10,5,25,35]
}
]
}"
Source:stackexchange.com