React Log Errors To Server

React Log Errors To Server – Troubleshooting apps running in production isn’t always easy. You say “Nothing is working!” You may receive error messages such as Additionally, some errors may be based solely on user input, and due to certain dependencies (e.g. user, API), it may be difficult to reproduce the issue… the list goes on!

There are many tools out there that can track down any error with detailed information, but reproducing even one can be difficult.

React Log Errors To Server

React Log Errors To Server

In this blog post, we will show you how you can leverage existing React and Flux infrastructure for a better sign-up and customization experience.

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The example in this blog post is a customer service application that allows you to manage open tickets. You can view open tickets and closed closed tickets.

React Log Errors To Server

End user John completes open tickets and closes them one by one. But suddenly … crash! So John went ahead and said, “Nothing is working!”

Jane, the developer is now saying “Nothing worked!” Assigned to work. error Very good. Fortunately, their application logs all Flux actions performed by the user. This action is associated with the user’s session, so it can further track John’s session. He can then replay John’s session and try to identify the problem.

React Log Errors To Server

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Ah! While trying to retry John’s session, an error occurs in the developer console. This looks like a bug

This is very easy to implement in your own Flux application. In our blog post about ReactJS authentication using Flux, we explain what a typical Flux application should look like. The job is sent to the shop, and the shop tells the component to update itself. So if we want to monitor all actions, we have to start with the operator:

React Log Errors To Server

The method we describe here will send the job to the operator, but after that it will send the data

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The first message will be logged to the console. This may be something you want to enable for non-production purposes. Then, if the user is logged in and no “remedial action” is taken, the data is uploaded to the backend.

React Log Errors To Server

When we repeat an action in a troubleshooting session, we’ll mark it as a “remedial action” to prevent this action from being sent back to the server.

And that’s basically it. Our backend will store all activity in a “session” in chronological order. The creator can then retry the session:

React Log Errors To Server

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The action tells the rest of the application that we are now repeating some action. This is important because one thing we want to protect is API calls in our application. So our HttpClient doesn’t make any calls during this time (in the next section, we’ll explain how it works and how to use Flux to record every request and response so we can replay everything later without needing any API interaction).

We then repeat each action and send it, followed by a small delay. As a result, the developer will see each action repeated (fast forward, because the delay is always 250m). Finally.

React Log Errors To Server

While debugging a Jane John session, we encountered a bug in one of the components, so it’s good to be aware of runtime errors. But what about API calls? When iterating, HttpClient will not make calls to our API, how can we iterate and complete API calls effectively? Well, we need to send an action every time we want to make a query, get a successful response, and every time the API throws an error.

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And if something goes wrong, we’ll send this action with the actual error:

React Log Errors To Server

It supports concepts like middleware which makes it easy to implement it in a generic way, but we’ll wrap it in a library.

If something goes wrong. This means that every question and answer is sent to and also goes to our backend. This way, we can easily loop through all actions, including data returned by possible API calls, without interacting with the actual API. This is useful if you have to repeat an issue that occurred a few days ago, where data may have been deleted or changed.

React Log Errors To Server

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The full source of this app is available on GitHub: https://github.com//react-flux-debug-actions-sample. Follow the instructions here to start the front and rear heads. I’ve used the MERN project (MySQL, Express, React, and Node.js) to create a blog post from scratch. As I slowly built it up and added bells and whistles to it, I learned many new things to share with other demons to avoid the obstacles they encountered on the way.

Previous topics included using Sequelize as an ORM for MySQL databases, using PassportJS and JWT for authentication and saved routes, enabling password reset via email using Nodemailer, and more. To be honest, working on building this app is all about learning more. Node, more React, more JavaScript taught me

React Log Errors To Server

If you want to see this repo and the rest of the code, I’ll link all of them at the bottom of this article.

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Today I’ll talk about proper error handling on both sides of a JavaScript application: from throwing errors on the Express server side to handling them on the client side with React and Axios.

React Log Errors To Server

Since the server side is where most of the errors occur, I’ll start with the Node.js/Express server code as well.

Indeed, for some time, during the development of this app, I was getting back HTTP status code 200 (status OK) from the express server, even though there were no errors such as missing JWT token or found user ID. database.

React Log Errors To Server

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I do this because I only want it to send HTTP status codes 401 (Forbidden) or 403 (Forbidden), but also because I want it to send a text message on the server side to let me know what the error is and for the longest time. , I don’t know how to do both with Express.

Return HTTP status 401 or 403 without additional information about what happened

React Log Errors To Server

Then, one day, I finally found the solution I was looking for, buried deep in the Express documentation, of which there are plenty. And it’s really not as complicated as I thought – it’s like I’m sending a message with a 200 HTTP status when an error occurs:

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Can work with objects, strings, or arrays in JavaScript. An example of a success message is an object with properties

React Log Errors To Server

The failure response is just a string, because if the response is successful, a JSON Web Token or other data can be sent from the server to the client. My errors, however, were nothing more than HTTP responses and string errors. you know the future. 🙂

Below is an example of one of the server routes in my app showing the complete execution of a successful or failed delivery when the user tries to update his private information while logged in. (I decided to put it in a formatted and highlighted image and code snippet copied from VS Code).

React Log Errors To Server

Logging Server · Github Topics · Github

The first thing that happens when route is hit is PassportJS takes over and checks if the user has a JSON Web Token, which happens in another file and is covered in another blog post, so I won’t get into that. Deep down about it.

In the MySQL database, and if found, the user information is updated and the HTTP status is 200 and a success message.

React Log Errors To Server

Server not found in database, not user error and 401 HTTP status and messages.

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The main part of the code in terms of error handling is here at the bottom of the file.

React Log Errors To Server

There is a bad status code and successful delivery from Express to browser. Now let’s talk about how browsers deal with this error.

For the client side of my full-stack application, I decided to use the very popular promises-based Axios library instead of the browser’s native API because it’s easier to use. This example will show all HTTP requests and error handling using Axios.

React Log Errors To Server

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Just as I gradually improve my error handling on the server side, I also improve my error handling on the client side as the application grows and improves.

Before handling the error thrown by the server,

React Log Errors To Server

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