pair view

[podhmo]

before.json with ljust(N, " ")
after.json with ljust(N, " ")
paste before.json after.json

[podhmo]

$ paste 000person.json 001person.json 
{	{
  "name": "foo",	  "name": "bar",
  "age": 20,	  "age": 21,
  "type": "person"	  "type": "person"
}	}

[podhmo]

$ cat <<-EOS > p.py
import sys

for line in sys.stdin:
    print(line.rstrip().ljust(30, " "))
EOS

$ paste <(cat 000person.json | python p.py) <(cat 001person.json | python p.py)

expected result

{                             	{                             
  "name": "foo",              	  "name": "bar",              
  "age": 20,                  	  "age": 21,                  
  "type": "person"            	  "type": "person"            
}                             	}