How to Merge Multiple JSON Files Using Python

We are given multiple JSON files and our task is to merge those multiple JSON files into a single JSON file with the help of different approaches in Python. In this article, we will see how we can merge multiple JSON files in Python.

JSON Files

Below are the two JSON files that we will use in our article to merge them into a single JSON file.

f.json

{"key1":"value1"}

s.json

{"key2": "value2"}

Merging Multiple JSON Files in Python

Below are some of the ways by which we can merge multiple JSON files in Python:

1. Using json Module
2. Using List Comprehension
3. Using os Module with json Module
4. Using glob Module with json Module
5. Using Pandas Library

Merge Multiple JSON Files Using json Module

In this example, a Python function merge_json_files is defined to combine data from multiple JSON files specified by file_paths into a list called merged_data. The merged data is then written to a new JSON file named "merged.json," and a confirmation message is printed.

import json


def merge_json_files(file_paths, output_file):
    merged_data = []
    for path in file_paths:
        with open(path, 'r') as file:
            data = json.load(file)
            merged_data.append(data)
    with open(output_file, 'w') as outfile:
        json.dump(merged_data, outfile)


file_paths = ["f.json", "s.json"]

output_file = "merged.json"

merge_json_files(file_paths, output_file)

print(f"Merged data written to '{output_file}'")