Developer
JSON Formatter
Format or minify JSON instantly in your browser.
JSON Validator
Validate JSON and see clear error details.
JWT Decoder
Decode JWT header and payload safely in your browser.
JWT Encoder & Builder
Build JWTs from header and payload JSON, with optional local HMAC signing.
LINQ to SQL Converter
Convert common LINQ query patterns into SQL drafts.
SQL to LINQ Converter
Convert common SQL query patterns into LINQ method syntax drafts.
UUID Generator
Generate and customize UUID values with selectable versions.
SQL Playground (SQLite)
Run SQLite queries in your browser with schema explorer and tabular results.
HTML/CSS/JS Playground
Edit HTML, CSS, and JavaScript with live sandbox preview and console output.
JavaScript Playground
Run JavaScript code in an isolated sandbox and inspect logs and errors.
Regex Tester
Test JavaScript regular expressions with matches, capture groups, and replace preview.
JSONPath Tester
Query JSON documents using JSONPath and inspect formatted results.
REST API Tester
Build and send HTTP requests from your browser, then inspect status, headers, and response bodies.
URL Parser / Builder
Parse URL parts and build normalized URLs using browser-native URL APIs.