Web & API
8 tools
Build curl commands, inspect HTTP, and debug API requests in your browser
cURL Command Generator & Builder
Web & API
Build curl commands in your browser — set method, headers, auth, and body, get a copy-ready command instantly. Presets for Bearer, POST JSON, file upload. Free, private, no signup.
htpasswd Generator — bcrypt, Apache MD5 (apr1) & Basic Auth
Web & API
Generate htpasswd entries with bcrypt, Apache MD5 (apr1), SHA-1 & more. Get ready-to-paste Apache, nginx & Docker config. 100% in your browser — no upload.
Open Graph & Meta Tag Generator
Web & API
Generate Open Graph, Twitter Card & SEO meta tags with a live Google, Facebook & X preview. 100% free, in-browser, no signup — copy & paste the code.
Nginx Location Tester — Why That Block Wins
Web & API
See which nginx location block wins — and why every other block lost. Free location match tester for =, ^~, ~ and ~*, running entirely in your browser.
Online Serial Terminal (Web Serial Monitor)
Web & API
Serial monitor in Chrome or Edge, no install: connect CH340, CP2102, ESP32 or Arduino, send text or HEX, repeat on a timer, append Modbus CRC-16 automatically. Garbled text? It spots GBK and redraws what was already received.
IPv4 Subnet Calculator
Web & API
Free IPv4 subnet calculator: enter 192.168.1.130/26 for the network address, broadcast, usable host range, netmask and wildcard, plus paste-ready Cisco and Linux config.
traceparent Decoder — W3C Trace Context
Web & API
Stop counting hex digits. Free online traceparent decoder — runs in your browser, nothing uploaded. Trace ID, span ID, all 8 trace-flags bits, tracestate check, Datadog/X-Ray/B3 conversion.
WebSocket Tester Online (ws/wss Client)
Web & API
Test a WebSocket from your browser: connect to ws:// or wss://, send text, JSON or real binary frames from HEX/Base64, read binary messages as HEX, and see close codes with reasons. Messages go straight to your server, not ours.