Write multiple JSON lines to JSON file

Question

I have a code that needs to read a JSON file with multiple lines, i.e:

{"c1-line1": "value", "c2-line1": "value"}
{"c1-line2": "value", "c2-line2": "value"}...

and, after change the keys values (already working), I need to write a new json file with these multiple lines, i.e:

{"newc1-line1": "value", "newc2-line1": "value"}
{"newc1-line2": "value", "newc2-line2": "value"}...

My problem is that my code are just writing the last value readed:

{"newc1-line2": "value", "newc2-line2": "value"}

My code:

def main():
   ... # changeKeyValueCode
   writeFile(data)
 
def writeFile(data):
   with open('new_file.json', 'w') as f:
       json.dump(data, f)
 
 

I already tried with json.dumps and just f.write('') or f.write('\n')

I know that data in writeFile() is correctly with each line value.

How can I resolve this, please?

Answer 1

def main():
   ... # changeKeyValueCode
   writeFile(data)
 
def writeFile(data):
   with open('new_file.json', 'a') as f:
       json.dump(data, f)

with open('new_file.json', 'a')

open file with (a), it will search the file if found append data to the end, else it will create empty file and then append data.