Developer Tools

Everyday utilities for programmers and DevOps. · 24 tools

Cron Expression ParserExplain any cron expression in plain English, check each field and preview the next run times in your time zone.Markdown EditorWrite Markdown with a live side-by-side preview, formatting toolbar, shortcuts, outline, autosave and .md or .html export.Unix Timestamp ConverterConvert Unix epoch timestamps in seconds, milliseconds, microseconds or nanoseconds to dates in any time zone, and back.UUID GeneratorGenerate UUID v4, v7, v1, v5 and v3 identifiers in bulk, with formatting options and a built-in UUID inspector.Chmod CalculatorCalculate Linux file permissions: tick read, write and execute boxes and get octal, rwx notation and ready-to-run chmod commands.Code Line CounterPaste source code to count total, code, comment and blank lines, with comment detection tuned for common language syntaxes.Crontab GeneratorBuild a crontab line visually with field editors for minute, hour, day, month and weekday, then read a plain-English preview and the next run times.curl to fetch ConverterPaste a curl command and get equivalent JavaScript fetch() code, with method, headers, body and basic auth all converted automatically.env File to JSON ConverterConvert a .env file (KEY=VALUE lines, with comments and quoted values) to a JSON object, or convert a flat JSON object back into .env format.Gitignore GeneratorBuild a .gitignore file by mixing built-in templates for languages, frameworks, editors and operating systems like Node, Python, macOS and VS Code.HTML to Markdown ConverterConvert HTML to clean Markdown, including tables, task lists, code blocks with language and strikethrough.HTTP Status Codes ReferenceLook up every IANA HTTP status code plus common nginx and Cloudflare extras, searchable by number, name or meaning, with the defining RFC and caching notes.Keyboard Event TesterPress any key to see its live key, code, keyCode and modifier (Ctrl/Alt/Shift/Meta) state, plus a running log of recent key presses.Markdown to HTML ConverterConvert Markdown to clean HTML with GitHub tables, task lists, heading anchors, sanitising and a live preview.MIME Type LookupLook up the MIME type for a file extension, or the extension(s) for a MIME type, from a built-in table of around 70 common types.NanoID GeneratorCreate short, URL-safe NanoIDs with custom length, alphabet and prefix, plus a collision-risk estimate.Open Source License GeneratorGenerate the full text of a common open-source license (MIT, Apache-2.0, BSD-3-Clause, GPL-3.0 notice, ISC or Unlicense) with your name and year filled in.README GeneratorGenerate a standard GitHub-style README.md with a title, description, installation and usage sections, license and optional badges.Semver ComparatorCompare two Semantic Versioning (semver.org) version strings to see which is greater and exactly what changed: major, minor, patch or pre-release.SQL FormatterPretty-print SQL for 20 dialects with configurable keyword case, indentation, operator placement and line width.SQL MinifierStrip comments and squeeze whitespace out of SQL while keeping string literals, quoted identifiers and optimizer hints intact.ULID GeneratorGenerate sortable ULIDs in bulk, decode their timestamps and convert between ULID and UUID formats.User Agent ParserDecode a User-Agent string into browser, engine, OS, device and CPU, flag bots and AI crawlers, and parse thousands of lines in bulk.Variable Name ConverterConvert identifiers between camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE and Title Case, one or many per line.

These are the small utilities developers reach for many times a day: generating IDs, decoding timestamps, explaining cron schedules, formatting SQL and turning cURL commands into code. Each one is built to give a precise, standards-based result instead of an approximation.

No sign-up and no server round-trip: the tools run locally in your browser, which keeps API keys, tokens and internal hostnames private. Keyboard shortcuts and copy buttons are available throughout.

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