Issue reading Json

[JamiesonDeuel]

                async with aiofiles.open('database\'+name+'.json', 'r') as f:
                   
                        
                    raw = await f.read()
                
                data = json.loads(raw)

I am getting this error, json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0), when I try to read this json file. {"Card": {}}

when open this json file normal, I do not get this error.

[Tinche]

Hi,

I can't reproduce it. Here's the code:

import json
from asyncio import run

import aiofiles


async def amain():
    async with aiofiles.open("db.json", "r") as f:
        raw = await f.read()

    data = json.loads(raw)
    print(data)


run(amain())

and the data:

{"Card": {}}

Seems to work. Can you provide more info?

[veganburrito86]

I am having this issue. If I read and write using regular "with open", everything is fine and works. Using aiofiles.open gives me an empty json file when I try to read it after writing to it:

import aiofiles
import asyncio
import json

async def amain():
    data = {"test": "wow", "testing": "wowwww", "3": 4585}
    result = await json_dump_to_file(data, "aiofiles_testing.json")
    print(result)

async def json_dump_to_file(data, file_name) -> bool:
    async with aiofiles.open("json\\temp.json", mode="w", encoding="utf-8") as f1:
        json.dump(data, f1, indent=2, ensure_ascii=False)
        f1.truncate()
    await asyncio.sleep(10) #  added this in case the file wasn't ready to be read or something
    async with aiofiles.open("json\\temp.json", mode="r", encoding="utf-8") as f2:
        raw = await f2.read()
        if len(raw) > 0:
            new_json = json.loads(raw)
        else:
            print("Error: Length of temp file was 0.")
            return False
    if new_json:
        async with aiofiles.open(f"json\\{file_name}", mode="w", encoding="utf-8") as f3:
            json.dump(new_json, f3, indent=2, ensure_ascii=False)
            f3.truncate()
        return True
    print("new_json was None")
    return False

asyncio.run(amain())

Maybe I'm making a mistake somewhere?

[Tinche]

@veganburrito86 The json module doesn't support aiofiles, since it's a Python module and aiofiles is a third-party library.

You have to use a diferent approach, like this:

import asyncio
import json

import aiofiles


async def amain():
    data = {"test": "wow", "testing": "wowwww", "3": 4585}
    async with aiofiles.open("test.json", "w") as f:
        await f.write(json.dumps(data, indent=2, ensure_ascii=False))


asyncio.run(amain())