array_filter.js

var jurusan = [
  {"id_jurusan_pendidikan":8,"nama":"Lainnya","jenjang_id":null},
  {"id_jurusan_pendidikan":9,"nama":"Reakayasa Perangkat Lunak","jenjang_id":2},
  {"id_jurusan_pendidikan":10,"nama":"Teknik komputer jaringan","jenjang_id":2},
  {"id_jurusan_pendidikan":11,"nama":"Multimedia","jenjang_id":2},
  {"id_jurusan_pendidikan":12,"nama":"Perhotelan","jenjang_id":2},
  {"id_jurusan_pendidikan":13,"nama":"Administrasi perkantoran","jenjang_id":2},
  {"id_jurusan_pendidikan":14,"nama":"IPS","jenjang_id":1},
  {"id_jurusan_pendidikan":15,"nama":"IPA","jenjang_id":1},
  {"id_jurusan_pendidikan":18,"nama":"Teknik Mesin","jenjang_id":4},
  {"id_jurusan_pendidikan":19,"nama":"Teknik Electro","jenjang_id":4},
  {"id_jurusan_pendidikan":20,"nama":"Teknik Informatika","jenjang_id":4},
  {"id_jurusan_pendidikan":21,"nama":"Arsitek","jenjang_id":4},
  {"id_jurusan_pendidikan":22,"nama":"Dokter","jenjang_id":4},
  {"id_jurusan_pendidikan":23,"nama":"IPS","jenjang_id":4},
  {"id_jurusan_pendidikan":24,"nama":"IPA","jenjang_id":4},
  {"id_jurusan_pendidikan":25,"nama":"Ekonomi","jenjang_id":4},
  {"id_jurusan_pendidikan":26,"nama":"Hukum","jenjang_id":4}
];

var jurusan = jurusan.filter(function(el){
    return el.jenjang_id == 1;
});

console.log(jurusan);
// result 
/**  [
      {"id_jurusan_pendidikan":14,"nama":"IPS","jenjang_id":1},
      {"id_jurusan_pendidikan":15,"nama":"IPA","jenjang_id":1}
     ]
**/