Dev Utilities tools

Regex tester, diff viewer, cron builder, HTTP status reference, .env parser, code minifiers, escape helpers and other small utilities developers reach for daily.

58 tools in this category · 9 sub-categories

CLI & Shell

FFmpeg Command Generator

Build ffmpeg commands for video and audio with explained flags.

FFmpeg Cheatsheet

Searchable ffmpeg command examples for video, audio and streaming.

FFmpeg Online — Run Commands in Your Browser

Run real ffmpeg commands on your video, audio or image — no install.

Code & Packages

Code Minifier & Beautifier

Minify or beautify JavaScript, CSS, HTML, JSON, XML and SQL.

Archive Extractor & File Explorer

Unzip ZIP, TAR, GZ, 7Z, RAR and more in your browser — browse folders, preview and download files.

Android APK Analyzer & Explorer

Open an APK, decode its manifest and browse or download every file inside.

UUID Validator

Validate and inspect UUIDs, including version and timestamp.

JavaScript Object to JSON

Convert a JS object literal into strict, valid JSON.

Package.json Validator

Validate package.json fields, semver ranges, and scripts.

Package Manager Command Converter

Convert install/run/exec commands between npm, yarn, pnpm and bun.

JavaScript / TypeScript Playground

Write and run JavaScript or TypeScript with a live console.

JSON to C# Class

Generate C# classes or records from JSON, with nullable reference types.

PHP Serialize Converter

Convert between PHP serialize() format and JSON.

HTML to JSX Converter

Convert HTML markup into clean React/JSX component code.

Maven ↔ Gradle Converter

Convert Maven POM XML to Gradle Kotlin DSL and back.

Properties ↔ JSON Converter

Convert Java .properties files to JSON and back, with nested keys.

DevOps & Config

Cron Expression Builder

Build cron expressions visually with a human-readable description.

Env File Parser

Convert .env files to JSON, YAML, or shell exports.

Dockerfile Linter

Lint a Dockerfile for common best-practice issues.

Chmod Calculator

Unix permission calculator: checkboxes, octal, and symbolic.

YAML Validator

Validate YAML and preview it as JSON.

.htaccess Redirect Generator

Generate Apache .htaccess redirect and rewrite rules.

Nginx Config Snippet Generator

Generate Nginx snippets for redirects, proxies, caching and security headers.

Bash Alias Generator

Create shell aliases for Bash, Zsh or Fish with correct quoting.

Crontab to Human Readable

Translate whole crontab files into plain English, line by line.

SSH Config Generator

Build ~/.ssh/config Host entries from simple form fields.

Kubernetes YAML Validator

Validate Kubernetes manifests and catch risky container settings.

Docker Compose Validator

Check docker-compose.yml for errors, bad ports and risky settings.

Nginx Config Analyzer

Analyse nginx.conf for syntax, security and performance issues.

GitHub Actions Workflow Validator

Validate a GitHub Actions workflow YAML and catch security and structure mistakes.

Docker Compose Generator

Build a valid docker-compose.yml from a simple service form.

Systemd Service File Generator

Build a production-ready systemd .service unit file.

.editorconfig Generator

Create an .editorconfig file with per-language overrides.

Git & Diff

Git Command Cheatsheet

Searchable reference of common git commands with copy buttons.

Semver Checker

Compare versions and test semver ranges (^, ~, >=).

Code Diff Merger

Side-by-side line diff of two code snippets with stats.

JSON Diff Viewer

Compare two JSON documents and see added, removed and changed keys.

Other

Screen Recorder

Record your screen, window or tab with optional microphone audio.

Typing Speed Test

Measure your typing speed in WPM with live accuracy tracking.

Code Line Counter (SLOC)

Count code, comment and blank lines in any source file.

References

iOS Device Screen Sizes Reference

Points, pixels, scale factors and App Store screenshot sizes for iPhone, iPad and Apple Watch.

Android dp ↔ px ↔ sp Converter

Convert dp, px and sp across every Android density bucket.

Android Manifest Permissions Reference

Searchable Android permission list with protection levels and manifest snippets.

Regex & Text

Regex Tester

Test regular expressions with live match highlighting.

String Escaper

Escape and unescape strings for JSON, JS, HTML, XML, SQL, RegExp, and shell.

Text to Slug Case

Convert identifiers between camelCase, snake_case, kebab-case, and more.

Line Sorter & Deduper

Sort, dedupe, and filter lines with regex include/exclude.

Regex Cheatsheet

Searchable regex syntax reference with examples and copy buttons.

Code Comment Stripper

Remove comments from JS, HTML, Python, or SQL source.

Tabs to Spaces Converter

Convert indentation between tabs and spaces.

Markdown TOC Generator

Build a linked table of contents from Markdown headings.

Code Screenshot Generator

Turn code snippets into shareable syntax-highlighted images.

SQL & Databases

SQL Formatter

Format and indent SQL queries for readability.

SQLite Database Viewer & Query Runner

Open a .sqlite/.db file in your browser and run SQL against it.

SQL Playground & Query Runner

Write schema and seed SQL, then run queries against an in-memory database.

SQL Query Analyzer

Find expensive SQL patterns, missing filters and index opportunities.

Validators

IBAN Validator & Formatter

Validate IBANs with the mod-97 checksum and country length rules.

Credit Card Validator (Luhn)

Check card numbers with the Luhn algorithm and detect the brand.