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Javascript

JavaScript (JS) is a programming language and core technology of the Web, alongside HTML and CSS. Created by Brendan Eich in 1995, it is maintained by Ecma International's TC39 technical committee, with related Web APIs maintained by W3C and WHATWG. As of 2025, JavaScript is the most widely used programming language on GitHub. We recommend using Typescript or knowing the performance challenges when using anything related to Javascript.

https://en.wikipedia.org/wiki/JavaScript

https://developer.mozilla.org/en-US/docs/Web/JavaScript

If building web and native user interfaces we recommend trying to use

https://react.dev/

https://vuejs.org/

React (also known as React.js or ReactJS) is a free, open-source front-end JavaScript library designed for building dynamic and interactive user interfaces (UIs). Maintained by Meta (formerly Facebook) and a vast community of developers, it allows you to build web applications that can update instantly without requiring a full page refresh

Performance

What's more performant than Javascript for server applications?

Is it better to use something other than Javascript for my API if I'm able to learn two languages?

Yes, Express.js is generally slower and less memory-efficient than a language like Go (Golang) that compiles down to machine code for server APIs. While Express.js handles basic Input/Output (I/O) tasks very efficiently, Go consistently outperforms it in high-concurrency raw throughput, heavy computational data processing, and minimal resource consumption.

Unlike languages like Java or C#, which compile to intermediate bytecode for a Virtual Machine (VM), the Go compiler transforms your source code directly into binary executables (CPU instructions) tailored to your specific operating system and processor architecture.

How the Go Compilation Process Works

Behind the go build command, the Go compiler toolchain translates your plain text files into 1s and 0s via a few specific phases:

  • Parsing: The compiler reads your .go source files and builds an Abstract Syntax Tree (AST) to understand the structure and logic of your code.

  • Type Checking & Optimization: Go performs strict semantic checks and converts the AST into an intermediate representation called Static Single Assignment (SSA). This stage optimizes the code by eliminating dead code and unneeded checks.

  • Machine Code Generation: Finally, the SSA is translated into specific architecture instructions (like AMD64, ARM64, or x86).

Important Characteristics of Go Binaries

Because of this direct-to-machine-code approach, Go executables have unique properties:

  • Statically Linked: By default, Go packs all dependencies and standard libraries directly into the single executable file. You do not need to install a Go runtime environment on the target machine to run the application.

  • Embedded Runtime: Even though it doesn't use a VM, Go embeds a lightweight runtime library directly inside the machine code binary. This library handles behind-the-scenes tasks like garbage collection, memory management, and goroutine scheduling.

  • Cross-Compilation: Go makes it remarkably easy to compile machine code for a different platform. By changing the environment variables GOOS (e.g., linux, windows, darwin) and GOARCH (e.g., amd64, arm64), you can build binaries for another system instantly without needing extra toolchains.

If you are working on a project, tell me your target operating system, target hardware architecture, or if you need help cross-compiling a binary. I can provide the exact build commands you need. [1]