Pretty-print JSON with Python's json.tool

Pretty-print a JSON file using Python (v2.5+)'s built-in json.tool module:

cat MYFILE.json | python -m json.tool

Python one-liner for reading a CSV file into a JSON array of arrays

Reading a CSV file into 2-d Python array (an array of arrays):

import csv
array = list(csv.reader(open( MYFILE.csv )))

Dumping that as JSON (via the command-line):

$ python -c "import json,csv;print json.dumps(list(csv.reader(open( CSV-FILENAME ))))"