Best Dev Utilities Tools

Test regular expressions with live match highlighting.

Build cron expressions visually with a human-readable description.

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

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

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

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

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

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

Validate and inspect UUIDs, including version and timestamp.

Convert a JS object literal into strict, valid JSON.

Searchable reference of common git commands with copy buttons.

Lint a Dockerfile for common best-practice issues.

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

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

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

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

Searchable regex syntax reference with examples and copy buttons.

Unix permission calculator: checkboxes, octal, and symbolic.

Format and indent SQL queries for readability.

Validate YAML and preview it as JSON.

Generate Apache .htaccess redirect and rewrite rules.

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

Convert indentation between tabs and spaces.

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

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

Build a linked table of contents from Markdown headings.

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

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

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

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

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

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

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

Measure your typing speed in WPM with live accuracy tracking.

Turn code snippets into shareable syntax-highlighted images.

Build ffmpeg commands for video and audio with explained flags.

Searchable ffmpeg command examples for video, audio and streaming.

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

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

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

Find expensive SQL patterns, missing filters and index opportunities.

Write and run JavaScript or TypeScript with a live console.

Validate Kubernetes manifests and catch risky container settings.

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

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

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

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

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

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

Searchable Android permission list with protection levels and manifest snippets.

Build a production-ready systemd .service unit file.

Create an .editorconfig file with per-language overrides.

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

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

Convert between PHP serialize() format and JSON.

Convert HTML markup into clean React/JSX component code.

Convert Maven POM XML to Gradle Kotlin DSL and back.

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