Javascript JSON.parse: Uncaught SyntaxError: Unexpected token N

Question

I have JSON data generated in Python using Flask's jsonify method.

When I try to parse it in Google Chrome by doing

JSON.parse(s)

I get the error

Uncaught SyntaxError: Unexpected token N

I can't post the json since it is proprietary and gigantic. Why would I be getting this error if the JSON is generated by a well tested method?

score 8 · Accepted Answer · edited May 23 '17 at 10:29

8

Use this tool to discover the problem: https://github.com/zaach/jsonlint

The problem was due to Flask's jsonify allowing the serialization of NaN, but Google Chrome's implementation following the JSON spec and not allowing NaN.

Some workarounds are listed here: How to parse JSON string containing "NaN" in Node.js

edited May 23 '17 at 10:29

Community

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answered Dec 04 '13 at 18:22

stephenbez

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Javascript JSON.parse: Uncaught SyntaxError: Unexpected token N

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