json_verify: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/json_verify - from package: yajl

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/json_verify - from package: yajl-tools

You may install the required package with command apt-get install {package}
Error in other languages:
json_verify: bevel nie gevind nie
json_verify: comandă negăsită
json_verify: comando não encontrado
json_verify: commande introuvable
json_verify: command not found
json_verify: käsku ei ole
json_verify: không tìm thấy lệnh
json_verify: komanda nerasta
json_verify: Kommando nicht gefunden.
json_verify: kommandot finns inte
json_verify: komut yok
json_verify: nie znaleziono polecenia
json_verify: níor aimsíodh an t-ordú
json_verify: no se encontró la orden
json_verify: no s'ha trobat l'ordre
json_verify: opdracht niet gevonden
json_verify: parancs nem található
json_verify: perintah tidak ditemukan
json_verify: príkaz nenájdený
json_verify: příkaz nenalezen
json_verify: команда не найдена
json_verify: командата не е открита
json_verify: 命令找不到
json_verify: コマンドが見つかりません