Fx is a terminal-based JSON viewer and processor written in Go, designed for developers who need to inspect and manipulate JSON and YAML data efficiently. It features an interactive TUI (Text User Interface) that allows users to navigate complex data structures with ease, utilizing familiar JavaScript syntax for data transformation. Fx supports streaming JSON, enabling it to handle large files and real-time data streams effectively. Additional features include support for JSON comments, trailing commas, big integers, and terminal autocompletion for bash, zsh, and fish shells. The tool is distributed as a single self-contained binary, making installation straightforward.