jsonyaml.com is a free collection of browser-based tools designed to make everyday developer tasks faster and less frustrating. The goal is simple, help developers, DevOps engineers, and data professionals convert, validate, format, and inspect data without installing extra software or writing one-off scripts. Everything runs directly in the browser, so work can move quickly while data stays on your own machine.

It covers the formats and utilities used daily. Convert between JSON and YAML, transform CSV to JSON, validate and format JSON or YAML, decode JWTs, generate hashes, test regex patterns, parse URLs and query strings, build and read cron expressions, run DNS lookups, resize images, and generate ICO or ICNS files from a PNG. The tools respond instantly, making them practical during real debugging sessions.

In practice, this means pasting a messy API response and cleaning it up in seconds, translating a cron expression like 0 9 * * * into a readable schedule, decoding a JWT to inspect its payload, or generating a favicon from a logo without opening design software. You can also upload CSV/JSON for quick data visualization, compare Kubernetes API specs across versions with the Kubernetes Spec Compare tool, and simulate request paths to validate DNS and redirect behavior. The focus is on reducing context switching and delivering quick, reliable results when a simple tool is all that’s needed.