JSFiddle - React, Tailwind, and code Playground

HTML

<!--

https://stackoverflow.com/questions/27862687/javascript-extract-array-from-json-object/33940255#33940255

Demonstrates how to extract a simple array from an array of objects


-->

CSS

body{font-family:monospace;font-size:5vw;}

JavaScript

var initialArr = [
                  {"a1" : "a1Val", "a2" : "a2Val", "a3" : "a3Val"}, 
                  {"b1" : "b1Val", "b2" : "b2Val", "b3" : "b3Val"},
                  {"z1" : "z1Val", "z2" : "z2Val", "z3" : "z3Val"}
                 ];

var resArr = initialArr.map(function(x){
    return x[Object.keys(x)[1]];
});
$('body').append( JSON.stringify(resArr) );