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Node js error callback is not a function

getId( uuid) ; / / change to getEventLog. getId( uuid, function( err, arrfound) = > { / / do somthing } ) ;. Run code snippet. The caller of the callback ( which is the client. get method in this case) decides what arguments are passed to the callback. You need to declare your callback to match what client. get says that it will pass to the callback. As mentioned by Jaromanda X in the answer, result is just declared and unassigned which should be a callback function. Also, the callback in search. js is being returned the error and result both as the first argument. You' re trying to call callback, here:. However, you' re not passing a callback to xmlObjectRepositoryLoader :. to check whether callback is a function or not and then call it to avoid the error thrown ( if its not a mandatory.

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    Callback function error

    You must pass function definition as a callback. function myCallback( returnedMeasures) { / / your code here }. and use it to call your other function like this: calcul( pas, myCallBack) ;. if that doesn' t help please provide more. writeHead( 500, { " Content- type" : " application/ json" } ) ; res. stringify( err ) ) ; } else { var output = { error: null, data:. That' s why album_ name parameter is assigned the actual callback, while callback parameter remains w my issue is that in listOps. js the outcome of both console logs is not the value I expect, it says [ Function] and undefined. Therefore I suspect, that this is a root cause for error message [ TypeError: callback is not a function]. That error means that you are not passing a function to Rol. getAllRoles( fn) when you call it. In addition, so that you can have proper error handling in your callback and so you can more easily distinguish between an error and. Thanks for the stripped- down repro.

    The error is being thrown because you' re invoking a null- valued variable as a function. When you call asyncTester yourself you provide null for asyncCb, while the function you give deJS TypeError Callback is not a function. fun2( callback) { var result = " result of function 2" ; callback( result) } ; fun1( log) ; / / displays " result of function 1" fun2( log ) ; / / displays " result of function 2" fun2( fun1( log) ) ; / / Type Error.