Developer Tools
12 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
Random IP Generator
Generate random IPv4 and IPv6 addresses for testing, development, and network configuration mockups.
e.g. Populate a database fixture with realistic-looking IP addresses for integration testing
URL Parser
Break down any URL into its individual components: protocol, host, port, path, query parameters, hash, and more.
e.g. Inspect an API endpoint URL to verify the base path, query parameters, and authentication credentials before making a request
Timestamp Converter
Convert Unix timestamps to human-readable dates and back. Supports seconds, milliseconds, ISO 8601, and multiple timezones.
e.g. Inspect a JWT token's iat (issued at) or exp (expiry) claim by converting the numeric timestamp to a readable date to debug authentication issues
Code Snippet
Share and format code snippets with syntax highlighting.
JSON to Table
Convert any JSON array into a clean, sortable, and searchable HTML table. Export as CSV or Markdown instantly.
e.g. Paste an API response to quickly visualise the data as a table during debugging
Chmod Calculator
Calculate Linux file permissions visually: toggle read, write, and execute for owner, group, and others to get the octal code, symbolic notation, and chmod command.
e.g. Work out the exact octal code for a new deployment script or config file before running chmod on a server