string.is is an open-source, privacy-friendly online string toolkit for developers.

Like most developers, I need to perform the same string operations regularly, but I’m paranoid about pasting sensitive data into third-party online tools.

I started to wonder what the ideal conversion tool might look like, and came up with some simple goals:

1. It should be open-source.
2. It should not set any cookies.
3. It should have a strict Content Security Policy.
4. It should be extremely opinionated about dependancies, and only use well-known, well-supported libraries.
5. It should try to detect the format of the input, and intelligently choose output options.

string.is was built to meet those goals, and provide a secure, trustworthy string conversion tool.

Alternatives

• DevUtils by Tony Dinh is a great open-source MacOS desktop tool.
• DevToys by Etienne Baudoux is an open-source Windows desktop tool which looks very good, although I haven't tried it.
• CyberChef by the UK’s GCHQ provides an exhaustive set of conversion and crypto tools, and works both online and offline.

Acknowledgements

string.is wouldn’t exist without the following open-source libraries:

• chrono-node
• crypto-js
• dayjs
• evergreen-ui
• fast-xml-parser
• hjson
• iarna-toml
• js-base64
• js-yaml
• jsonwebtoken
• lodash
• next
• next-translate
• papaparse
• prettier
• showdown
• sql-formatter
• HTML code detection was inspired by is-html.

The icon is based on developer by Achmad Mulyana.

Contact

• Twitter: @string__is or @davemetrics
• Github: github.com/recurser/string-is