Error: json.load in python

Question

why is this true:

  import json
  json.loads('{"A":2}')

but this is wrong:

  json.loads('{"A":2,}')

OR

  json.loads("['A':2]")

Because {"A":2,} (trailing comma) and ['A':2} ([],{} mismatch, key not in double quotes) are not valid JSON. See json.org and jsonlint.com. — Felix Kling
– Felix Kling, Commented Apr 30, 2012 at 0:13

ThiefMaster · Accepted Answer · 2012-04-30 00:15:13Z

3

JSON is a subset of JavaScript. This means things that are valid JavaScript are not necessarily valid JSON.

{"A":2,} is valid JS (except in old IE versions), but not valid JSON
['A':2} is not even valid JS since the braces do not match. If they matched, it would still be invalid JSON as JSON always uses " and never ' to quote strings.

See http://json.org/ for the JSON specs.

answered Apr 30, 2012 at 0:15

ThiefMaster

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2 Comments

mehRad Over a year ago

oops , i mean json.loads("['A':2]")

Felix Kling Over a year ago

@mehRad: Still wrong, because of (a) key is not in double quotes and (b) the : is invalid there. Either define an object: {k:v, k:v, ...} or an array [v, v, ...]. That's how JSON is defined, you just have to remember it. Therefore: json.org

Community · Accepted Answer · 2020-06-20 09:12:55Z

1

Because the last two options are not a valid json

There should be no comma after last element
a [ should match a ] (array) and a { should match a } (object)

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Apr 30, 2012 at 0:13

MByD

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