Formatters, encoders & everyday dev utilities
Format JSON, encode and decode Base64 or URLs, test regex, minify code, and convert between data formats — free, fast, and built to run entirely in your browser.
What are developer tools?
Developer tools are the small utilities that come up dozens of times during a normal coding session — formatting a blob of minified JSON to actually read it, decoding a JWT to check its claims, encoding a string to Base64 for an API header, or testing a regular expression before dropping it into production code. None of these need a full IDE or a CLI install; they need a page that opens in a second, does the one transformation correctly, and doesn't get in the way of the rest of the work.
Every tool in this collection runs the transformation directly in the browser. The JSON formatter, XML/YAML/CSV converters, and minifiers parse and rewrite the input the moment it changes, using the same parsing logic a build tool would use — just without the build step. The UUID generator and hash-adjacent tools compute results using the browser's own crypto and random APIs. Nothing is sent to a server to be processed, so there's no upload step and no delay between pasting code in and seeing the result.
Who uses these tools, and for what
Backend developers reach for the JSON formatter and JWT decoder while debugging an API response, and the timestamp converter and number base converter when reading logs or working across binary, hex, and decimal. Frontend developers use the CSS and JavaScript minifiers to check output size, and the HTML entity encoder when handling text that needs to render safely. Anyone integrating with an API leans on the Base64 encoder/decoder and URL encoder/decoder for headers, tokens, and query strings, while the regex tester and diff checker help catch mistakes before they ship — comparing two versions of a file or validating a pattern against real sample input before it goes into code.
Why they're free, fast, and private by default
Code, API responses, and tokens pasted into a formatter or decoder are often sensitive — an auth header, a snippet from a private repo, a JWT carrying real user data. Every tool here processes that input locally in the browser tab only; nothing is transmitted to a server, logged, or retained after the tab closes. That also removes any file-size anxiety or network latency from the equation, so results appear the instant an input changes, whether it's five lines of JSON or five thousand.
That's the whole premise of this category: free, instant, and private enough to paste in real data without a second thought. No signup wall between a problem and its answer, and new developer tools are added here as they're built.