Online Tool Store
198 Articles
Developer Tools
Articles filed under Developer Tools.
Showing 148–168 of 198 articles
💬 Developer Tools
How to Preview BBCode as Rendered HTML
Paste BBCode forum markup and see it rendered as HTML instantly, entirely in your browser.
{ } Developer Tools
How to Query JSON With JSONPath Expressions
Test JSONPath expressions against real JSON data with instant results, supporting property access, wildcards, and recursive descent, in your browser.
🔌 Developer Tools
How to Read the Raspberry Pi GPIO Header
Understand the Pi's 40-pin header, the difference between physical and BCM numbering, and the voltage limits that damage boards when ignored.
🌲 Developer Tools
How to Test an XPath Expression Against XML
Paste an XML document and an XPath expression to see every matching node or value listed instantly, entirely in your browser.
🖱️ Developer Tools
How to Test Every Mouse Button and Scroll Direction
Click and scroll to test every mouse button and scroll wheel direction, with live counters for each, entirely in your browser.
🆔 Developer Tools
How to Validate a UUID's Format and Version
Check whether a UUID is correctly formatted, and see its version and variant decoded, with a random UUID generator to test with, in your browser.
🗄️ Developer Tools
How to Write a Reversible Database Migration
Write up and down migration SQL for Postgres or MySQL, and know which statements lock a live table before you run them against production.
⚙️ Developer Tools
How to Write a Safe GitHub Actions Workflow
Build a CI workflow with narrow token permissions, lockfile-based caching and sensible triggers, avoiding the defaults that quietly widen your blast radius.
🧱 Developer Tools
How to Write Accessible HTML Table Markup
Build HTML tables with proper thead, tbody and scope attributes so screen readers announce data correctly, and know when a table is the wrong element.
💻 Developer Tools
How to Build and Check a Cron Expression
Use a cron expression builder to create five-field schedules, preview next run times, and catch cron rules that never fire.
📄 Developer Tools
How to Check If XML Is Well-Formed and Format It Cleanly
Paste XML to check it is well-formed and reformat it with consistent indentation, live as you type, entirely in your browser.
💻 Developer Tools
How to Convert CSS to Tailwind Classes
Use a Tailwind class converter to translate CSS declarations into utilities, expand shorthand, and preserve off-scale values.
💻 Developer Tools
How to Convert Env Files to JSON Safely
Use an env file to JSON converter to parse dotenv values, expand references, detect duplicates, and mask secrets for sharing.
🎨 Developer Tools
How to Convert HEX, RGB, HSL, and CMYK Colors
Convert a color between HEX, RGB, HSL, and CMYK formats instantly, with a color picker and one-click copy for each format, in your browser.
🕒 Developer Tools
How to Convert UNIX Timestamps
Use a UNIX timestamp converter for seconds, milliseconds, microseconds, nanoseconds, UTC, local time, ISO week, and 2038 warnings.
💻 Developer Tools
How to Create Highlighted HTML From Code
Use a code syntax highlighter to turn snippets into escaped, highlighted HTML with inline styles or CSS classes.
💻 Developer Tools
How to Draft HTML With Live Preview
Use an HTML code editor to draft HTML documents with title controls, editing modes, preview, and export in a browser workspace.
💻 Developer Tools
How to Escape Strings for the Right Context
Use a string escape tool to escape and unescape text for JSON, HTML, URLs, regex, shell, SQL, CSV, and more contexts.
🧾 Developer Tools
How to Find a JSON Syntax Error Fast
Validate JSON as you type with clear line-and-column error hints, plus one-click pretty-printing, instead of scanning a wall of text for a missing comma.
💻 Developer Tools
How to Format Messy HTML
Use an HTML formatter to re-indent minified or tangled markup with custom indentation and short elements kept inline.
🔗 Developer Tools
How to Generate Clean URL Slugs
Use a slug generator to turn titles into SEO-friendly URL slugs in bulk with word-safe truncation and collision warnings.