A BBEdit text filter to prettify JSON.

PrettyJSON.py

#!/usr/bin/env python3                                                                                                                           

# A text filter for BBEdit. If it encounters a JSON error, it writes an error                                                                    
# message to stderr (appears in a new BBEdit window) and leaves the original                                                                     
# text unaltered. c.f.                                                                                                                           
# http://crisp.tumblr.com/post/2574967567/json-pretty-print-formatting-in-bbedit                                                                 
# c.f. http://blog.scottlowe.org/2013/11/11/making-json-output-more-readable-with-bbedit/                                                                                                            

import json
import sys

def main():
    input = sys.stdin.read()
    try:
        obj = json.loads(input)
    except Exception as e:
        sys.stderr.write(f"Error reading JSON: {str(e)}\n")
        return 1
    json.dump(obj, sys.stdout, ensure_ascii=True, indent=2)
    return 0

if __name__ == '__main__':
    sys.exit(main())