Why Do I Get an Error When Using Single Quotes in JSON Strings in Python?

Understanding Single vs. Double Quotes in JSON for Python

While it's true that Python allows the use of both single and double quotes for enclosing strings, this flexibility does not extend to JSON syntax. When working with JSON in Python, it's crucial to pay attention to the specific syntax requirements.

In the code snippet provided:

s = "{'username':'dfdsfdsf'}" #1
#s = '{"username":"dfdsfdsf"}' #2
j = json.loads(s)

Line #1 results in an error because it uses single quotes, which are not allowed for JSON syntax. Double quotes are required for JSON strings. Line #2, however, is correct as it uses double quotes.

Therefore, when working with JSON in Python, always ensure that strings are enclosed with double quotes. JSON syntax strictly enforces this rule for all strings, regardless of whether you use single or double quotes in Python in general.

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