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By Damilola Olatunji
In Node, managing asynchronous operations effectively (especially those involving I/O, like network requests or file system access) is crucial to prevent resource depletion. Managing async operations well also helps maintain optimal application performance when the results of operations are no longer required. The AbortController API addresses this need by providing a standardized mechanism to terminate operations gracefully.
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By Johanna Larsson
Communication between processes in the Erlang VM happens through message passing. In fact, all communication across processes occurs through the same mechanism. All you need is an address and you can send a message to it, with the lower level building blocks being send and receive. This is true even if that address is on another node in a cluster of Elixir nodes that are aware of each other. In fact, it works in exactly the same way.
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By Ashley Davis
It’s not enough to just test our code's happy path (in other words, the error-free path we hope our users will take). To be really confident our code can’t be abused, either accidentally or on purpose, we must actively attack it to try and find ways of breaking it. If we don’t do this, someone else will, and they probably won’t be as friendly.
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By Aestimo Kirina
While Elixir provides built-in libraries (like HTTPoison) for making HTTP requests, the Tesla library has gained popularity due to its simplicity, ease of use, and extensibility. Tesla offers a clean and composable way to define requests, handle responses, and customize client behavior. Even so, whenever you're working with external APIs, errors are inevitable. Network issues, server downtime, rate limiting, and unexpected responses can all lead to errors in your application.
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By Federico Trotta
Regular expressions, commonly known as regex, are a tool for text processing and pattern matching. In Python, the re module offers a robust implementation of regex, allowing developers to handle complex text manipulation efficiently. In this article, we'll get to grips with regular expressions and provide practical code examples — from the basic to more advanced — so you can understand how to use regex in Python.
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By Damilola Olatunji
For several years now, the Node.js ecosystem has been steadily shifting towards ES modules (ESM) as the preferred method for sharing and utilizing JavaScript code. While CommonJS has served the community well, ESM are rapidly gaining traction as they offer a standardized approach for creating JavaScript modules across all supported runtimes.
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By Pulkit Goyal
In part one of this series, we managed distributed state using GenServers. This provided a foundation for understanding some core concepts in distributed Phoenix applications. Now, we turn our focus to deployment and scaling strategies. As your application evolves to meet growing demands, knowing how to scale horizontally, maintain high availability, and monitor distributed components becomes crucial.
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By Nik Tomazic
In this article, you'll learn about N+1 queries, how to detect them with AppSignal, and how to fix them to speed up your Django apps significantly. We'll start with the theoretical aspects and then move on to practical examples. The practical examples will mirror scenarios you might encounter in a production environment. Let's get started!
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By Antonello Zanini
Unit tests are essential for increasing the test coverage of a backend application, ensuring its reliability, functionality, and robustness. Jest has become one of the most popular solutions when unit testing in Node, due to its intuitive API, zero-configuration philosophy, and flexible approach to code transpilation. In this guide, you will learn more about Jest, explore its features, and see it in action through a complete example. Become a Jest unit testing expert!
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By Ayush Newatia
In the previous part of this series, we discovered how to create persistent connections in Rack in theory, but now we'll put what we learned into practice. The web has two formalized specifications for communication over a persistent connection: server-sent events (SSEs) and WebSockets. WebSockets are widely used and highly popular, but SSEs are far less well-known. Let's explore them first.
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Made for teams that want to build high quality Ruby and Elixir applications, AppSignal offers amazing insights into errors and performance issues, plus host monitoring and an easy to use custom metrics platform.
AppSignal supports the Elixir language with an Elixir package. The package supports pure Elixir applications and frameworks including Phoenix, Plug & Erlang.
AppSignal supports the Ruby language with a Ruby gem. The gem supports many frameworks and gems including Capistrano, DataMapper, Delayed Job, Grape, MongoDB, Padrino, Rack, Rake, Resque, Ruby on Rails, Sequel, Shoryuken, Sidekiq, Sinatra & Webmachine.
AppSignal now supports Node.js! The package supports pure JavaScript applications and TypeScript applications, and can auto-instrument various frameworks and packages with optional plugins.
AppSignal also has amazing support for catching errors from Front-end JavaScript applications and sending them to AppSignal, including the React, Vue, Angular, Ember, Preact & Stimulus frameworks.
Packed with features:
- Alerts in your tools: AppSignal integrates with Slack, Flowdock, HipChat, OpsGenie and more.
- Control your notifications: AppSignal notifies you exactly when you want to. Get the first exceptions per deploy, all of them of never. Set thresholds for performance notifications.
- Amazing support: We don't do "first line" and "second line" support: you get to speak with a developer, immediately.
- Send to issue trackers: A single click creates an issue with all the necessary details in your issue tracker of choice.
- Manage teams and users: Add users to teams and give them access to specific or all, existing and/or new applications you monitor.
- Focus on design: Developer tools do not need to be complicated and ugly. Our interface is kept clean and easy to use.
Catch errors, track performance, monitor hosts, detect anomalies — all in one tool.