jsonlint: 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/jsonlint - from package: php-jsonlint
/usr/bin/jsonlint - from package: python-demjson

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

On Debian possible default full paths are:

/usr/bin/jsonlint - from package: python-demjson

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