Developer

Decode and inspect JWT header and payload.

Generate RFC-4122 version 4 UUIDs.

Test regular expressions with live match highlighting.

Convert between Unix timestamps and human dates.

Explain a cron expression in plain English.

Look up the meaning of HTTP status codes.

Find the MIME type for a file extension.

Convert a cURL command to fetch or Python.

Create a signed HS256 JWT.

Convert Unix file permissions between octal and symbolic.

Build an HTTP Basic Authorization header.

Show the next scheduled times for a cron expression.

Solve width/height for a target aspect ratio.

A quick reference of common regex tokens.

Full ASCII table with dec, hex, oct and binary.