Python3.6解析JSON文件遇JSONDecodeError问题求助

Hey there! Let's figure out why you're hitting this JSON decoding error—even if you swear you're using double quotes for property names. That error message (Expecting property name enclosed in double quotes) usually points to subtle syntax issues in your JSON file that aren't obvious at first glance. Here are the most likely culprits and fixes to try:

1. Invisible special characters (like BOM) #

Sometimes JSON files saved on Windows or with certain editors include a UTF-8 BOM (Byte Order Mark) at the start—this is an invisible character that messes up the parser. You might not see it, but Python's json module will choke on it.

Fix this by opening the file with the utf-8-sig encoding to skip the BOM:

import json

with open('your_json_file.json', 'r', encoding='utf-8-sig') as f:
    data = json.load(f)

You can also enable "show all characters" in your text editor (like VS Code, Sublime Text) to check for weird invisible symbols at the start of the file.

2. Fake "double quotes" (full-width or similar characters) #

It's easy to accidentally use full-width Chinese double quotes (“”) instead of standard English double quotes ("")—they look almost identical, but JSON only recognizes the latter.

Go through your JSON file and double-check every property name's quotes. Replace any “name” with "name".

3. Trailing commas #

JSON doesn't allow trailing commas after the last property or array item. For example, this is invalid:

{
  "item1": "value1",
  "item2": "value2",  // This comma is not allowed!
}

Delete that extra trailing comma to fix the syntax.

4. Comments in the JSON file #

JSON doesn't support comments (// or /* */), but many people add them anyway. If your JSON has comments, the parser will throw an error because it doesn't recognize those tokens.

Remove any comments from your JSON file entirely.

5. Validate your JSON syntax quickly #

Use Python's built-in json.tool to check your file for syntax errors. Run this command in your terminal:

python -m json.tool your_json_file.json

This will either pretty-print your valid JSON or point exactly where the syntax error is—super helpful for pinpointing issues you might have missed.

If you've tried all these and still run into trouble, feel free to share a snippet of your JSON file and Python code (redacting any sensitive info) and we can dig deeper!

内容的提问来源于stack exchange，提问作者robertg