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I must be missing something simple here, but I'm having trouble retrieving data from a JSON array response. I can access objects with identifiers that start with letters, but not ones that start with numbers.

For example, I can access

data.item[0].specs.overview.details

But I can't access

data.item[0].specs.9a99.details

I must be missing something simple here, but I'm having trouble retrieving data from a JSON array response. I can access objects with identifiers that start with letters, but not ones that start with numbers.

For example, I can access

data.item[0].specs.overview.details

But I can't access

data.item[0].specs.9a99.details
  • javascript
  • arrays
  • json
  • object
  • identifier
Share Improve this question edited Nov 1, 2014 at 6:28 tshepang 12.5k25 gold badges97 silver badges139 bronze badges asked Apr 25, 2010 at 22:37 Archie EcArchie Ec 705 bronze badges 3
  • 1 Argh, I should have known this. Thanks for all the quick answers! I'm going to accept the first one. – Archie Ec Commented Apr 25, 2010 at 22:44
  • Don't forget to accept an answer. It's a good way to improve your chances of getting help in the future. – NG. Commented Apr 25, 2010 at 22:48
  • Yup, I did, but the system won't let me accept answers for 15 minutes after the question is asked. Thanks for the info, though! I also voted up all the answers that were correct. – Archie Ec Commented Apr 25, 2010 at 23:03
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5 Answers 5

Reset to default 5

Use bracket notation

that is:

data.item[0].specs["9a99"].details

Identifier literals must not begin with a number because they would be confused with number literals. You need to use the bracket syntax in this case:

 data.item[0].specs["9a99"].details

Try this,

data.items[0].specs["9a99"].details

A variable name in javascript cannot start with a numeral. That's the reason why it doesn't work.

Javascript doesn't like variables or identifiers that start with a number, this reference states that only:

Any variable name has to start with
_ (underscore) 
$ (currency sign) 
a letter from [a-z][A-Z] range 
Unicode letter in the form \uAABB (where AA and BB are hex values)

are valid first characters.

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