[issue21451] Improve error messages for malformed JSON
New submission from Raymond Hettinger:
The error message for malformed JSON just tells you that the JSON is invalid,
it doesn't say why (showing you which character bombed, what text is being
read, what the pending openers are, or what allowable characters would have
been expected). In the absence of this information, it is very difficult to
debug hand-rolled JSON.
json.loads('sample_file.json') # students find this hard to debug
json.loads('''[
boys: 10,
girls: 20,
]''')# hard to see trailing comma
json.loads(['python', 'perl', 'ruby']) # needs double quotes
json.loads([[10, 20], [30, 40]]]) # unbalanced delimiters
--
messages: 218062
nosy: rhettinger
priority: normal
severity: normal
status: open
title: Improve error messages for malformed JSON
type: enhancement
versions: Python 2.7, Python 3.4, Python 3.5
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[issue21451] Improve error messages for malformed JSON
R. David Murray added the comment:
Python 3.4.0+ (3.4:d994d75cce95, May 6 2014, 21:37:02)
[GCC 4.8.2] on linux
Type help, copyright, credits or license for more information.
import json
json.loads('''[
... boys: 10,
... girls: 20,
... ]''')
Traceback (most recent call last):
...
ValueError: Expecting ',' delimiter: line 2 column 17 (char 18)
json.loads(['python', 'perl', 'ruby'])
Traceback (most recent call last):
...
ValueError: Expecting value: line 1 column 2 (char 1)
json.loads([[10, 20], [30, 40]]])
Traceback (most recent call last):
...
ValueError: Extra data: line 1 column 21 - line 1 column 22 (char 20 - 21)
See issue 16009 for when this was added. Can you improve these? (The first one
looks odd...) If so, you could reopen this.
--
nosy: +r.david.murray
resolution: - duplicate
stage: - resolved
status: open - closed
superseder: - Json error messages could provide more information about the
error
versions: -Python 2.7, Python 3.4
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[issue21451] Improve error messages for malformed JSON
Raymond Hettinger added the comment: What do you think about backporting the improved error messages? -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue21451 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue21451] Improve error messages for malformed JSON
R. David Murray added the comment: Hmm. I guess I don't have any objection in principle. It is hard to imagine why someone would depend on the exact format of the old low-information messages, though anything is possible. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue21451 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
