regular expression tester with syntax highlighting, explanation, cheat sheet for php/pcre, python, go, javascript, java, c#/.net, rust.

free online tools like code beautifiers, code formatters, editors, viewers, minifier, validators, converters for developers: xml, json, css, javascript, java, c#, mxml, sql, csv, excel

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jsonlint is the free online validator, json formatter, and json beautifier tool for json, a lightweight data-interchange format. you can format json, validate json, with a quick and easy copy+paste.

online json formatter / beautifier and json validator will format json data, and helps to validate, convert json to xml, json to csv. save and share json

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figma is the leading collaborative design tool for building meaningful products. seamlessly design, prototype, develop, and collect feedback in a single platform.

opinionated code formatter

powerful, extensible, and feature-packed frontend toolkit. build and customize with sass, utilize prebuilt grid system and components, and bring projects to life with powerful javascript plugins.