UncaughtUncaught syntax error unexpected token u in JSON at position 0

Question

I'm currently using the Algolia JS API but for some reason I keep randomly getting the following error in console:

UncaughtUncaught syntax error unexpected token u in JSON at position 0

My current code looks like this:

    var params  = {
        hitsPerPage: 10,
        page: 0,
        facets: '*'
    }   
    index.search('some search term', params, function load_search_products_callback(err, content) {
        console.log(content);
    });

The problem is that the error occurs before the console.log(content) part of the code is run, so I'm unable to actually what the problem is or where it's happening.

something is **u**ndefined and `JSON.parse` is being run on it ... what is `search_query_term` - can't see where you initialise that - so it could be **u**ndefined — Jaromanda X, Jan 17 '17 at 05:08
Sorry, I didn't define it properly in the question, it's just some simple string. — user2028856, Jan 17 '17 at 05:10
what type of parameters does `index.search` expect - is that your function, or something from a library? — Jaromanda X, Jan 17 '17 at 05:12
That error is normally seen when the value given to `JSON.parse` is actually `undefined`. — Pranav Patel, Jan 17 '17 at 05:14
It's from the Algolia API `https://www.algolia.com/doc/api-client/javascript` — user2028856, Jan 17 '17 at 05:14
Which browser? because in the console you can get a stack trace for errors — Jaromanda X, Jan 17 '17 at 05:19
I'm running this on Safari but the error was caused on another browser. In Safari I get `SyntaxError: JSON Parse error: Unexpected identifier "undefined"` — user2028856, Jan 17 '17 at 05:24
add `if (err) { console.error(err); }` to `load_search_products_callback` function for debugging content. — x01saa, Jan 17 '17 at 08:47

score 2 · Answer 1 · answered Jan 17 '17 at 05:17

2

From looking at your code I can predict it is a JS code.

UncaughtUncaught syntax error unexpected token u in JSON at position 0 occur when you pass undefined to JSON.parse as an argument.

var a = undefined; JSON.parse( a );

This can be the issue in your code. You need to figure out where this is happening in your code.

I hope that'll help

answered Jan 17 '17 at 05:17

Sparsh Pipley

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8
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`From looking at your code I can predict it is a JS code` - the [javascript] tag was my first clue that the code is javascript – Jaromanda X Jan 17 '17 at 05:18

UncaughtUncaught syntax error unexpected token u in JSON at position 0

1 Answers1