How can i fix json.decoder.JSONDecodeError ?

[JgKSuperstar]

Hello, how do I solve this problem?

import json

def write_json(new_date, filename='data.json'):
    try:
        
        with open(filename, 'r+') as file:
            #First we load existing data into a dict. (Önce mevcut verileri bir dict'e yüklüyoruz)
            file_data = json.load(file)
    

            file_data["emp_details"].append(new_date)

            # Sets file's current position at offset. (Dosyanın geçerli konumunu ofset olarak ayarlar.)
            file.seek(0)

            # convert back to json. (Json'a dönüştür.)

            json.dump(file_data, file, indent=4)

            #  python object to be appended (Eklenecek python nesnesi)
    except json.decoder.JSONDecodeError:
        return
    
        
y = {"emp_name":"Nikhil",
    "email": "[email protected]",
    "job_profile": "Full Time"
    }

write_json(y)
    

Error:
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

[buran]

Your current snippet raise different error

Error:
Traceback (most recent call last):
  File "***", line **, in <module>
    write_json(y)
  File "***", line **, in write_json
    file_data["emp_details"].append(new_date)
TypeError: list indices must be integers or slices, not str

[snippsat]

file_data = json.load(file)

When you do this file_data it's a dictionary.
Then on line-11 can not use .append as that method is only for list.
For dictionary can use .update
Don't use try: except with return nothing,when test out stuff want to see all errors.
Quick test working.

import json
from pprint import pprint

def write_json(new_date, filename='data.json'):
    with open(filename, 'r+') as file:
        file_data = json.load(file)
        #print(file_data)

        file_data["scripts"].update(new_date)
        #pprint(file_data)
        file.seek(0)
        json.dump(file_data, file, indent=4)

if __name__ == '__main__':
    y = {
        "emp_name": "Nikhil",
        "email": "[email protected]",
        "job_profile": "Full Time",
    }
    write_json(y)

[JgKSuperstar]

Your current snippet raise different error

Error:
Traceback (most recent call last):
  File "***", line **, in <module>
    write_json(y)
  File "***", line **, in write_json
    file_data["emp_details"].append(new_date)
TypeError: list indices must be integers or slices, not str

I'm sorry, the code I gave you is wrong. No blocks try and except.

[JgKSuperstar]

file_data = json.load(file)

When you do this file_data it's a dictionary.
Then on line-11 can not use .append as that method is only for list.
For dictionary can use .update
Don't use try: except with return nothing,when test out stuff want to see all errors.
Quick test working.

import json
from pprint import pprint

def write_json(new_date, filename='data.json'):
    with open(filename, 'r+') as file:
        file_data = json.load(file)
        #print(file_data)

        file_data["scripts"].update(new_date)
        #pprint(file_data)
        file.seek(0)
        json.dump(file_data, file, indent=4)

if __name__ == '__main__':
    y = {
        "emp_name": "Nikhil",
        "email": "[email protected]",
        "job_profile": "Full Time",
    }
    write_json(y)

I'm getting the same mistake again. Could it be that when we turn it on to read mode, the "data.json" file is empty and gives it this error?

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[snippsat]

You don't show content of data.json.
Here is my test with a random validated json file.
data.json before:

{
    "devDependencies": {
        "eslint": "^6.8.0",
        "eslint-config-prettier": "^6.10.1",
        "prettier": "^2.0.2"
    },
    "scripts": {
        "eslint": "eslint . --fix",
        "eslint:check": "eslint .",
        "lint": "npm run prettier && npm run eslint"
    },
    "dependencies": {
        "@jsxtools/resize-observer": "^1.0.4"
    }
}

import json
from pprint import pprint
 
def write_json(new_date, filename='data.json'):
    with open(filename, 'r+') as file:
        file_data = json.load(file)
        #print(file_data)
 
        file_data["scripts"].update(new_date)
        #pprint(file_data)
        file.seek(0)
        json.dump(file_data, file, indent=4)
 
if __name__ == '__main__':
    y = {
        "emp_name": "Nikhil",
        "email": "[email protected]",
        "job_profile": "Full Time",
    }
    write_json(y)

data.json after:

Output:
{
    "devDependencies": {
        "eslint": "^6.8.0",
        "eslint-config-prettier": "^6.10.1",
        "prettier": "^2.0.2"
    },
    "scripts": {
        "eslint": "eslint . --fix",
        "eslint:check": "eslint .",
        "lint": "npm run prettier && npm run eslint",
        "emp_name": "Nikhil",
        "email": "[email protected]",
        "job_profile": "Full Time"
    },
    "dependencies": {
        "@jsxtools/resize-observer": "^1.0.4"
    }
}

[JgKSuperstar]

You don't show content of data.json.
Here is my test with a random validated json file.
data.json before:

{
    "devDependencies": {
        "eslint": "^6.8.0",
        "eslint-config-prettier": "^6.10.1",
        "prettier": "^2.0.2"
    },
    "scripts": {
        "eslint": "eslint . --fix",
        "eslint:check": "eslint .",
        "lint": "npm run prettier && npm run eslint"
    },
    "dependencies": {
        "@jsxtools/resize-observer": "^1.0.4"
    }
}

import json
from pprint import pprint
 
def write_json(new_date, filename='data.json'):
    with open(filename, 'r+') as file:
        file_data = json.load(file)
        #print(file_data)
 
        file_data["scripts"].update(new_date)
        #pprint(file_data)
        file.seek(0)
        json.dump(file_data, file, indent=4)
 
if __name__ == '__main__':
    y = {
        "emp_name": "Nikhil",
        "email": "[email protected]",
        "job_profile": "Full Time",
    }
    write_json(y)

data.json after:

Output:
{
    "devDependencies": {
        "eslint": "^6.8.0",
        "eslint-config-prettier": "^6.10.1",
        "prettier": "^2.0.2"
    },
    "scripts": {
        "eslint": "eslint . --fix",
        "eslint:check": "eslint .",
        "lint": "npm run prettier && npm run eslint",
        "emp_name": "Nikhil",
        "email": "[email protected]",
        "job_profile": "Full Time"
    },
    "dependencies": {
        "@jsxtools/resize-observer": "^1.0.4"
    }
}

My json file is empty

[JgKSuperstar]

If the json file is not empty, the yes code does not give an error

[snippsat]

If the json file is not empty, the yes code does not give an error

If start with empty file can not use json.load(file) on that file.
Make the the structure you want first with a dictionary,then json.dump to make it json file.
Example.

import json
from pprint import pprint

def write_json(new_date, filename='d.json'):
    json_make = {}
    with open(filename, 'r+') as file:
        json_make["emp_details"] = new_date
        file.seek(0)
        json.dump(json_make, file, indent=4)

if __name__ == '__main__':
    y = {
        "emp_name": "Nikhil",
        "email": "[email protected]",
        "job_profile": "Full Time",
    }
    write_json(y)

Output:
{
    "emp_details": {
        "emp_name": "Nikhil",
        "email": "[email protected]",
        "job_profile": "Full Time"
    }
}

[JgKSuperstar]

If the json file is not empty, the yes code does not give an error

If start with empty file can not use json.load(file) on that file.
Make the the structure you want first with a dictionary,then json.dump to make it json file.
Example.

import json
from pprint import pprint

def write_json(new_date, filename='d.json'):
    json_make = {}
    with open(filename, 'r+') as file:
        json_make["emp_details"] = new_date
        file.seek(0)
        json.dump(json_make, file, indent=4)

if __name__ == '__main__':
    y = {
        "emp_name": "Nikhil",
        "email": "[email protected]",
        "job_profile": "Full Time",
    }
    write_json(y)

Output:
{
    "emp_details": {
        "emp_name": "Nikhil",
        "email": "[email protected]",
        "job_profile": "Full Time"
    }
}

I'm sorry for troubling you. Thank you very much for your patience and help my problem has been solved :) <3