Error Unhandled in Node.js Application

I have encountered an issue in my NodeJS application where I have unhandled code in the data layer connecting to the database. I deliberately generate an error in the code but do not catch it. Here is an example:

AdminRoleData.prototype.getRoleByRoleId = function (params) {
    var connection = new xtrDatabaseConnection();
    var query = "CALL role_getRoleByRoleId(:p_RoleId)";
    var replacements = { p_RoleId: params.roleId };
    replacements = null;
    return connection.executeQuery(query, Sequelize.QueryTypes.RAW, replacements);
} 

The line 'replacements = null;' is where I am intentionally creating an error without any error handling in place. I would like to be able to capture these types of unhandled errors in my application and log them as exceptions or errors in a file.

process.on('uncaughtException', (err) => {
    logger.log('Oops! An uncaught error occurred', err);
    // Implement graceful shutdown,
    // close database connections, etc.
    process.exit(1);
});

However, I am facing an issue where my 'uncaughtException' event is not being triggered. Can anyone offer assistance? What are the best practices for handling such scenarios, or is there a way to globally catch these errors at a centralized location?

Answer №1

In the case of using express, it is essential to first define all your routes as follows:


app.use('/api/customers', customers);
app.use('/api/products', products);
...

Subsequently, you can handle 404 errors in this manner:

app.use(function(req, res, next) {
  console.log("404 Error - Page Not Found");
  next(err);
});

To round it off, create a block to catch all errors:

// error handler
app.use(function(err, req, res, next) {
  console.log(err.message);
  res.status(err.status || 500);
  res.render('error');
});

Note: The sequence of functions plays a crucial role. If the 404 handler comes before other routes, everything might be perceived as a 404 response. Node will navigate through routes based on their declaration order until a match is found.

Answer №2

To handle potential errors in your code, enclose it within a try-catch block and output any errors to the console.

try {
    //Add your error-prone code here
}catch (error){
    console.log("ERROR:" + error.toString());
}

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