Tools
Small tools, big help.
Three everyday developer tools. Everything runs in your browser — nothing you paste is sent anywhere.
JSON is the text format most apps use to send data. Paste some below to tidy it up or find the mistake.
Every time your browser asks a server for something, the server answers with a three-digit code. Here are the ones you'll actually meet.
Enter an IPv4 address with a prefix (like /24) to see which addresses belong to that network.
Tip: /24 is the typical home network — 254 usable addresses, from .1 to .254.