CODEWITHSUNDEEP
javascriptjson
Anton Gildebrand
Anton Gildebrand

Reputation: 3707

Trying to parse JSON string, unexpected number

I am trying to parse this JSON:

var json = '{"material":"Gummislang 3\/4\" 30 m (utanp\u00e5liggande sk\u00e5p)"}'

I run JSON.parse(json) but i get the error SyntaxError: Unexpected number when doing so. I have tried this in Google Chrome. I don't know what the problem is since I can take the JSON string and put it in any JSON validator and it claims that the JSON is valid. Shouldn't the browser be able to parse it?

Upvotes: 3

Views: 8007

Answers (2)

PleaseStand
PleaseStand

Reputation: 32072

You are inserting a JSON object representation into a JavaScript string without properly escaping the representation.

To avoid having to do this, remove the quotes you are adding around the representation, and skip the JSON.parse(json) – the default output from PHP's json_encode() is valid JavaScript when used in this context.

For security, you should specify the JSON_HEX_TAG option if possible. This will prevent cross-site scripting in cases where the JSON might end up inside a document parsed as XML. (And for XML documents, the JSON should be inside a CDATA section as well.)

Upvotes: 6

SLaks
SLaks

Reputation: 887405

You're validating the string literal, which is a valid JSON string containing invalid JSON. You need to validate the value of the string, which is not valid JSON.

If you paste the string value into a JSON validator, you'll see that the error comes from this part:

"material": "Gummislang 3/4"30m

The " needs to be escaped.

Upvotes: 4

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