Guides
Developer tool how-tos
Practical guides paired with free browser tools—JWT, Base64, JSON, DNS, and more.
- How to decode a JWT online
- How to generate a secure API key
- How to create a strong password
- How to convert an image to Base64
- How to generate OTP / TOTP codes online
- How to format JSON online
- How to generate UUID and ULID
- How to Base64 encode and decode text
- How to convert Unix timestamps
- How to generate a hash online
- How to URL encode and decode
- How to test a regex online
- How to explain a cron expression
- How to look up DNS records online