Developer Tools
Utilities for scheduling, debugging and automation. Everything computes locally — no signup, no uploads.
Timestamp Converter
Unix time to date and back — seconds, milliseconds or microseconds, plus a live clock.
Regex Tester
Test regular expressions with live highlighting, capture groups and replace preview.
Color Converter
HEX, RGB, HSL and OKLCH at once, with a live swatch and WCAG contrast check.
Cron Expression Generator
Build, validate and decode cron expressions with next-run preview.
Subnet Calculator
IPv4 CIDR in — network, broadcast, host range, masks and private/public scope out.
Number Base Converter
Binary, octal, decimal and hex — plus every base to 36, bit views and BigInt precision.
cURL to Code
Paste a cURL command from DevTools and get fetch, axios, Python, Go, PHP, Java, C# or Ruby.
API Tester
Send HTTP requests with custom headers, a JSON body and auth — then read the status, timing and the response.
HTTP Status Codes
Every 1xx–5xx code with its plain-English meaning, the practical fix and the non-standard ones nginx, Cloudflare and AWS emit.
MIME Types Reference
The correct Content-Type for every common file extension, plus the wrong-type mistakes that actually break things.
Chmod Calculator
Octal ⇄ symbolic Linux permissions in both directions, with setuid, setgid, sticky and the ready-to-paste command.
ASCII Table
All 128 characters in decimal, hex, octal and binary with HTML entities and control names — plus the 128–255 extended range.
User-Agent Parser
Decode a UA string into browser, engine, operating system, device and CPU — and see what a UA string cannot tell you.
Webhook Debugger — coming soon
Capture and inspect webhook payloads in real time.
.gitignore Generator — coming soon
Generate .gitignore files for your stack in one click.
Built for people who ship
Developer tools have a simple requirement: they must be fast and never get in the way. BasaltKit developer utilities open instantly, work offline, and keep your data on your device — paste production expressions or configurations without worrying about where they end up.
The cron expression generator supports the standard five-field format used by crontab,
Kubernetes CronJobs, GitHub Actions schedules, Spring's @Scheduled and most
job schedulers, with a plain-English explanation and a preview of the next execution times.
The reference tables — HTTP status codes, MIME types, the ASCII table and the chmod calculator — are built the same way: everything is rendered into the page, so search works offline and instantaneously, and clicking a value copies it. No lookup ever leaves your browser, which is why you can paste a private hostname or an internal content type without thinking twice.