Features use a format like (assuming you are not including geometry):
[
{
"attributes" : {
"Name" : "TestName",
"ColumnTwo": 2
}
},
{
"attributes" : {
"Name" : "TestName2",
"ColumnTwo": 3
}
}
]
Note the coma on line 7 as it joins the next feature. Typically, the feature would include "attributes" and "geometry".
[
{
"attributes" : {
"Name" : "TestName",
"ColumnTwo": 2
},
"geometry" : {
"x" : -111.111,
"y" : 111.111
}
}
]
For more information see: Add Features