Developer Tools
7 free tools · No sign-up · 100% browser-based
AllCoreKit's developer tools cover the utilities that come up constantly during development: formatting JSON you just copied from an API response, decoding a JWT to check its claims, testing a regex before committing it, encoding a URL parameter, understanding a cron expression, or converting a hex colour to HSL. Each tool runs entirely in your browser with no server round-trips required.
Base64 Encoder/Decoder
Encode text to Base64 or decode Base64 back to plain text in real-time.
e.g. Decode a JWT payload to inspect its claims without a separate JWT tool
JSON Formatter
Paste JSON to auto-format, validate, and spot errors with inline highlighting.
e.g. Pretty-print a minified API response to inspect its structure during debugging
URL Encoder/Decoder
Encode or decode URLs and query strings in real-time, both directions.
e.g. Encode a query string parameter that contains special characters before appending it to a URL
Hash Generator
Generate MD5, SHA-1, and SHA-256 hashes instantly from any text input.
Regex Tester
Test and debug regular expressions with live match highlighting, flag controls, and a quick-reference cheat sheet.
e.g. Validate that an email address, phone number, or postal code matches an expected format
JWT Decoder
Decode and inspect JSON Web Tokens — header, payload, signature, expiry — entirely in your browser.
e.g. Inspect the claims in an auth token during API debugging
Color Converter
Convert colors between HEX, RGB, HSL, and RGBA with a live swatch, color picker, alpha slider, and recent color history.
e.g. Convert a brand colour from hex to HSL to create tints and shades for a design system
Cron Explainer
Decode any cron expression into plain English, preview the next 5 run times, and browse common schedules.
e.g. Decode an unfamiliar cron expression in a legacy codebase to understand when it runs
Code Snippet
Share and format code snippets with syntax highlighting.