Your code expects JSON but receives malformed or non-JSON data, causing parse errors.
'Unexpected token' error in console
'JSON.parse' failure
Response looks like JSON but isn't valid
Server returning HTML error page instead of JSON
Trailing comma in JSON
Unescaped special characters
UTF-8 BOM in response
DevConsole shows raw response bodies and automatically validates JSON. Instantly see what's wrong with the response.
See exactly what the server sent, before parsing.
Use the built-in JSON validator to find syntax errors.
Verify the response header says 'application/json'.
Often means the server threw an error and returned its default error page. Check for 500 errors.
Check Content-Type header before parsing, and wrap JSON.parse in try-catch.
DevConsole gives you the visibility and control to fix issues like json parse error in seconds, not hours.
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