Dev Utils

Browse Dev Utils developer tools on RunTools.dev, with focused utilities you can open quickly for debugging, conversion, validation, and daily workflow tasks.

Dev Utils

19

Python Beautifier

Format Python with indentation, wrapping, and whitespace controls.

JavaScript Beautifier

Tidy JavaScript with indentation, wrapping, and spacing options.

Markdown Preview

Render Markdown in real time with a clean, readable preview.

Indent and tidy complex SQL so queries stay readable.

Cron Expression Parser

Validate cron schedules and preview upcoming runs.

Test and debug regular expressions with live highlighting.

JSON to TypeScript Converter

Convert JSON into TypeScript interface/type definitions.

Color Converter

Convert between HEX, RGB, HSL, and CMYK and build quick palettes.

Chmod Calculator

Calculate and convert Unix/Linux file permissions between octal (755) and symbolic (-rwxr-xr-x) formats.

Compare two texts with unified or split view, full or incremental context.

Convert strings between camelCase, snake_case, PascalCase, and other common naming conventions.

Count characters, words, and lines instantly.

Lorem Ipsum Generator

Generate realistic placeholder text for mockups and drafts.

JSONPath Tester

Query JSON data locally with a safe JSONPath subset.

Convert cURL commands to fetch, axios, and Python requests snippets locally.

Convert titles or sentences into clean URL-friendly slugs instantly.

Color Contrast Checker

Check the WCAG 2.1 contrast ratio of any color pair and see AA and AAA results instantly.

Sort lines alphabetically or naturally, remove duplicates, and clean up any text list right in your browser.

JSON Schema Generator

Turn any JSON sample into a ready-to-use JSON Schema with types, formats, and required fields.