![]() ![]() Return `$ Copy Coerce stringable arguments into string literals. The custom object could be serialized as a url with the implementation of a custom toString function. They had built an object similar to the nodejs Url class, which provides some easier access and utilities to build up a url string. They called it with a serializable object. The Facebook sdk didn’t call fetch with a string. In our case, we were wrapping a JavaScript function to intercept fetch requests for instrumentation, and we had expected the url property as defined in the fetch specification would be a string. This error can be thrown for a lot of reasons, as it is incredibly common to reference the length property of string or array during everyday development. It is important to defensively typecheck data passed in from external scripts and systems before interacting with them. This is a blocking error, and execution will stop. ![]() length is commonly used on string and array, but a custom object could also have this property. This error indicates that our code expects to have an object with a length property, but that object was not present. Our Debugging blog series explores symptoms, causes, and solutions to common JavaScript errors. In fact, this is the 6th most common error, affecting nearly 28% of accounts. ![]() While looking into an issue with Microsoft Edge and the Facebook sdk a few weeks ago, we ran into a very common error: Cannot read property ‘length’ of undefined. ![]()
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