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I used the codes posted here = https://stackoverflow.com/questions/57015170/how-to-merge-and-split-again-thousands-of-text-files

import os
import glob

#merging code // merge.py
import os
import glob

with open("common.json", "w", encoding="utf8") as common:
    for json in glob.glob("./*.json"):
        with open(json, "r", encoding="utf8") as f:
            content = f.read()
        common.write("{} (\n{}\n)\n".format(os.path.basename(json), content))


#splitting code // split.py
with open("merged.json", "r", encoding="utf8") as common:
    for line in common:
        name = line[:line.find(" (")]
        text = line[line.find(" ("):line.rfind(")")]
        with open(name, "w") as f:
            f.write(text)

merge.py works good, but when I run split.py after merging the files I'm getting this error:
    
split.py, line 8, in <module>
with open(name, "w") as f:
OSError: [Errno 22] Invalid argument: '        "Language": "en",'

The merged .json file looks like this:
    
 (

)
TEXTFILE1.JSON (
[
    {
        "Language": "en",
        "String": aaaaaa"
    },
    {
        "Language": "fr",
        "String": "xxxxxxxx"
    },
]
)
TEXTFILE2.JSON (
[
    {
        "Language": "en",
        "String": cccccccc"
    },
    {
        "Language": "fr",
        "String": "bbbbb"
    },
]
)