One liner solutions for ES6+
Unique by label and value
arr.filter((v,i,a)=>a.findIndex(t=>(t.label === v.label && t.value===v.value))===i)
Unique by all properties of the object:
arr.filter((v,i,a)=>a.findIndex(t=>(JSON.stringify(t) === JSON.stringify(v)))===i)
