just like https://github.com/antonmedv/fx

fx.py

#!/usr/bin/env python
import sys
import json
import types


def usage():
    print('usage:')
    print(
        """\techo '{"foo": [{"bar": "value"}]}' | """
        f'{sys.argv[0]} <python expression>'
    )
    print(f'\tcat json-file | {sys.argv[0]} <python expression>')
    print(f'\tcurl http://json-api | {sys.argv[0]} <python expression>')
    sys.exit()


def show(obj):
    print(json.dumps(obj, indent=4, ensure_ascii=False))


def load_json():
    data = None
    try:
        data = json.load(sys.stdin)
    except json.decoder.JSONDecodeError:
        usage()
    return data


def exec_function(fn, this):
    return fn(this)


def main():
    exprs = sys.argv[1:]
    this = load_json()
    if not this:
        usage()

    for expr in exprs:
        result = eval(expr)
        if type(result) == types.FunctionType:
            result = exec_function(result, this)
        this = result
    show(this)
    return this


if __name__ == '__main__':
    main()