TwoThink Dev
A string toolbox for developers
JSON, Base64, timestamps, JWT, cron, regex and password generation — all pure front-end, 0 uploads, 0 sign-ups.
0 loading time
No WASM, no heavy libraries. String tools are ready the moment the page opens — the lightest site in the matrix.
0 uploads
Your content is handled in browser memory only: it never reaches our servers and we never force an account.
Works in WeChat
Pure front-end APIs, so the WeChat WebView can handle everyday debugging too.
All tools
15 in total · no business npm dependencies
JSON Formatter
Validate, prettify and minify, with errors reported by line and column.
Base64 Encode & Decode
Encode and decode text with Base64, safe for non-ASCII characters.
URL Encode & Decode
encodeURIComponent / decode, so parameters survive non-ASCII text.
Timestamp Converter
Convert between seconds and milliseconds, with Beijing time and UTC.
Base Converter
Convert between 2 / 8 / 10 / 16, with big numbers and negative values.
UUID Generator
Native browser v4, generated in batches and ready to copy.
JWT Decoder
Inspect the header and payload; the signature is not verified.
Hash Calculator
SHA-1 / 256 / 384 / 512, computed purely in the browser.
Cron Parser
A plain-English explanation plus the next run times, including seconds.
Text Diff
Compare left and right, highlighting additions, deletions and changes.
Password Generator
Cryptographically strong random passwords with a strength estimate and one-click copy.
Regex Tester
Live match highlighting, capture groups and a replacement preview.
CSV ⇄ JSON Converter
Quoted fields and flattened nesting, converted both ways locally.
SQL Formatter
Uppercase keywords, break clauses onto new lines, align subqueries.
Markdown Editor
Edit on the left, preview on the right, rendered as React elements to block XSS.