utils logo UTILS
Free online tools to generate, calculate,
convert, format, encode, and play.
 

Programming Utils

Programming language playgrounds and formatters. Write, run, and format code in Python, JavaScript, Rust, and more — all in your browser.

API Tester
Free online REST API tester. Send GET, POST, PUT, DELETE requests with custom headers and body. Inspect response status, headers, and body with JSON syntax highlighting. Saves request history in your browser.
Database Schema Designer
Visually design database tables, define columns and types, draw relationships, then export as SQL CREATE statements or a diagram image.
HTML Playground
Write and preview HTML, CSS, and JavaScript in a live editor. See changes rendered instantly side by side.
JavaScript
Run JavaScript code directly in your browser. Free online JavaScript interpreter with interactive REPL.
JSON Schema Generator
Free online JSON Schema generator. Paste a JSON sample and instantly infer a JSON Schema with types, required fields, string formats, and numeric constraints. Edit the result and export it, all in your browser.
Python
Run Python code directly in your browser. Free online Python interpreter powered by Pyodide.
Rust
Run Rust code online using the official Rust Shell API. Free online Rust compiler and executor. Test code, learn Rust, and experiment instantly.
SQL
Run SQL queries in your browser using SQLite. Free online SQL database with sample data. Learn SQL, test queries, and experiment with databases.
TypeScript
Run TypeScript code online. Free TypeScript compiler in your browser. Test code, learn TypeScript, and see JavaScript output.

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