Split JSON array to files, use attribute as filename

split-json.sh

#!/bin/bash

# Split JSON array to files, use json attribute as filename
#
# input.json: 
# [
#    {"id":"1", "name":"first"},
#    {"id":"1", "name":"second"},
#    ...
# ]
#
# ./split.sh /path/to/input.json name 
# 
# Output: 
#
# first.json  // {"id":"1", "name":"first"}
# second.json  // {"id":"2", "name":"second"}
# ...

input="$1"
name="$2"
dir=$(dirname "$input") 

echo $output
jq -cr 'keys[] as $k | "\($k)\n\(.[$k])"' "$input" | while read -r key; do
  filename=$(jq --raw-output ".[$key].$name" $input)
  read -r item
  printf '%s\n' "$item" > "$dir/$filename.json"
  echo "$filename.json" 
done

echo "> done."