Hello.

• I have script:
  json_data.sh

  #!/bin/bash
  # Generate JSON data for zabbix
  # json_data.sh "field1 field2 ... fieldn" "data1 data2 ... datan"
  
  declare -i i
  fields=$1
  data=($2)
  json=""
  i=0
  while [ $i -lt ${#data[*]} ]; do
      row=""
      for f in $fields; do
          row+="\"{#$f}\":\"${data[$i]}\","
          i+=1
      done
      json+="{${row%,}},"
  done
  echo -e "{\"data\": [${json%,}]}"
  

• Macros
  {$IPDESCR}="88.151.176.41 SKY 93.185.69.98 KTC1 93.185.69.102 KTC2"

• Discovery rule:
  Type: External check
  Key: json_data.sh["IP DESCR", {$IPDESCR}]
  And i always have error Value should be a JSON object.

for testing i create TEXT item with key json_test.sh["IP DESCR", {$IPDESCR}]
ln -s json_data.sh json_test.sh
In history i have

2017-05-18 10:23:00 1153:20170518:072300.562 zbx_popen(): executing script
{"data": [{"{#IP}":"88.151.176.41","{#DESCR}":"SKY"},{"{#IP}":"93.185.69.98","{#DESCR}":"KTC1"},{"{#IP}":"93.185.69.102","{#DESCR}":"KTC2"}]}

So result is valid JSON object. But why i have this error?