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First of all you forgot to close the array of datasets in line 29.
secondly it is not valid to define functions in JSON results (Line 45).
check this : Is it valid to define functions in JSON results?
And again you forgot to close curly brace at the end .
{
"type": "line",
"data": {
"datasets": [{
"data": [{
"t": 1551096300000,
"y": 22.8125
}, {
"t": 1551096600000,
"y": 22.8125
}, {
"t": 1551096900000,
"y": 22.8125
}, {
"t": 1551097200000,
"y": 22.8125
}, {
"t": 1551097500000,
"y": 22.8125
}, {
"t": 1551097800000,
"y": 19.3125
}],
"label": "Sample data",
"fill": false,
"backgroundColor": "rgba(0,128,0,1.000)",
"borderWidth": 2,
"borderColor": "rgba(0,128,0,1.000)"
}],
"options": {
"responsive": true,
"maintainAspectRatio": true,
"title": {
"display": true,
"position": "top",
"text": "Temperature (°C)"
},
"legend": {
"position": "bottom"
},
"hover": {
"mode": "dataset"
},
"animation": {
"onComplete": ""
},
"scales": {
"xAxes": [{
"type": "time",
"time": {
"displayFormats": {
"millisecond": null,
"second": null,
"minute": "HH:mm",
"hour": "DD/MM HH:mm",
"day": "DD/MM HH:mm",
"week": null,
"month": "DD/MM HH",
"quarter": null,
"year": null
},
"tooltipFormat": "DD/MM/YY HH:mm"
}
}]
},
"elements": {
"point": {
"radius": 1,
"hitRadius": 2,
"hoverRadius": 2
}
}
}
}
}
Source:stackexchange.com