Check if Javascript Object only contains falsy values

As a one-liner:

!Object.keys(obj1).some(function(k) {return obj1[k];});
// Array.some returns true if any callback returns true
// You want true if all return false, aka if none return true
// So just negate Array.some

As a more readable method:

var ok = true, k;
for( k in obj1) if( obj1.hasOwnProperty(k)) {
    if( obj1[k]) {
        ok = false;
        break;
    }
}