Combining json files in python

Question

I have 3 json files as below:

test1.json:

{"item":"book1","price":"10.00","location":"library"}

test2.json:

{"item":"book2","price":"15.00","location":"store"}

test3.json:

{"item":"book3","price":"9.50","location":"store"}

I have this code:

import json
import glob

result = ''
for f in glob.glob("*.json"):
    with open (f, "r") as infile:
        result += infile.read()

with open("m1.json", "w") as outfile:
    outfile.writelines(result)

I get the following output:

{"item":"book1","price":"10.00","location":"library"} 
{"item":"book2","price":"15.00","location":"store"}
{"item":"book3","price":"9.50","location":"store"}

Is it possible to get each file as a new line separated by a comma like below?

{"item":"book1","price":"10.00","location":"library"},  <-- line 1
{"item":"book2","price":"15.00","location":"store"},    <-- line 2
{"item":"book3","price":"9.50","location":"store"}      <-- line 3

While producing your desired output is possible, it is not JSON. — user3515670
– user3515670, Commented Mar 8, 2022 at 15:09
Maybe you're not looking for a JSON string, but rather an array? — Ariel A
– Ariel A, Commented Mar 8, 2022 at 15:12

Lei Yang · Accepted Answer · 2022-03-08 15:24:39Z

1

As others commented, your expected result is invalid json. But if you really want the format, use str.join() is more convenient.

jsons = []
for f in glob.glob("*.json"):
    with open (f, "r") as infile:
        jsons.append(infile.read())
result = ',\n'.join(jsons)

infile.read() gets the string, d = json.loads(infile.read()) can get a real json object(dict).

To write a valid combined json(of type list(of dict)), just write s = json.dumps(jsons) to file.

edited Mar 8, 2022 at 15:24

answered Mar 8, 2022 at 15:10

Lei Yang

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