Developer Tools
Developers reach for small utilities dozens of times a day: to read a minified API response, decode a token payload, check a hash, or work out why a regular expression matches too much.
Pasting production data into an unknown website is a real security concern, so every tool in this category runs locally in your browser. Nothing you paste is transmitted, logged or stored.
The 8 tools in this category
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JSON Formatter and Validator
Pretty-print, minify and validate JSON with exact error locations. -
Base64 Encoder and Decoder
Encode and decode Base64 for text and files, including URL-safe Base64. -
URL Encoder and Decoder
Percent-encode and decode URLs, and inspect their parts. -
Hash Generator
Create MD5 and SHA hashes of text or files and verify checksums. -
UUID Generator
Generate v4 and v7 UUIDs in bulk and inspect existing ones. -
Regex Tester
Test regular expressions with live highlighting and capture groups. -
HTML, CSS and JavaScript Minifier
Shrink HTML, CSS and JavaScript by removing what browsers do not need. -
Password Generator
Generate strong random passwords with cryptographic randomness.
What is included
The JSON Formatter and Validator pretty-prints, minifies and validates JSON with line and column error positions. The Base64 Encoder and Decoder and URL Encoder and Decoder handle UTF-8 text correctly, and the Base64 tool also encodes files.
The Hash Generator produces MD5, SHA-1, SHA-256, SHA-384 and SHA-512 digests of text or files. The UUID Generator creates random version 4 and time-ordered version 7 identifiers, the Regex Tester highlights matches and capture groups, the HTML, CSS and JavaScript Minifier reduces file size, and the Password Generator creates strong passwords using your browser's cryptographic random number generator.
Security notes
None of these tools execute the code or data you paste. JSON is parsed with the browser's native parser, regular expressions run in an isolated background worker that is stopped if a pattern takes too long, and the JavaScript minifier parses code without running it. Even so, avoid pasting live secrets such as private keys or production passwords into any web page, including this one, unless you understand where the page's code comes from.