UD5 Toolkit
ETag & Last‑Modified Validator - Online Check Cache Headers
Send conditional requests to a URL and verify that the server correctly handles ETag and If‑None‑Match. Audit caching.
.htaccess Validator - Online Check Syntax
.htaccess Validator - Check Syntax Online
Instantly validate your .htaccess file for syntax errors, misconfigurations, and security best practices.
.htaccess Code
Validation Results
Results will appear here after validation.
Frequently Asked Questions
.htaccess is a configuration file used by Apache web servers. It allows you to change server behavior on a per‑directory basis, including URL rewriting, access control, error pages, and more.
A single typo or misformatted rule in .htaccess can break your entire website, leading to a 500 Internal Server Error. This online validator helps you catch errors before you deploy the file.
It spots unknown directives, unclosed block tags (like
<IfModule>), missing rewrite rule parameters, and gives security suggestions such as enabling Options -Indexes.Yes, this tool runs entirely in your browser. You can paste your .htaccess content and validate it immediately – no server upload required.
Revert your .htaccess file to a backup or remove recent changes. Use this validator to check the syntax, paying special attention to
RewriteRule and unrecognized commands. Also ensure the correct modules are enabled.At minimum, implement
Header set X-Content-Type-Options "nosniff" and Header always set X-Frame-Options "SAMEORIGIN". This tool will warn you if they are missing.GeoJSON Validator - Online Check Geometry & Properties
Paste a GeoJSON object and validate its structure. Catch missing coordinates, wrong types, and feature errors. Local.
IBAN Structure Checker - Online Validate Format & Country
Check if an IBAN has the correct length and structure for its country. Early validation, no bank connection.
Vocal Pitch Monitor & Tuner - Online Real‑Time Frequency
Sing or play an instrument into the mic and see the detected pitch on a real‑time chromatic tuner. Use for practice or ear training.
Fake User Persona Generator - Online UX Placeholder
Create a realistic‑looking user persona card with a name, photo placeholder, quote, and demographics. Perfect for design projects.
Voice Pitch Detector - Online Live Mic Frequency
See the fundamental frequency (pitch) of your voice in real time using auto‑correlation. For singers and speech training. No upload.
Speech Dispatcher Tester - Online Explore All Voices
List all available TTS voices on your system. Test each with any text. Adjust rate and pitch. Find the best voice.
Semantic Versioning Validator - Online Check Semver Syntax
Validate and compare semantic version strings. Check if a version satisfies a range (e.g., ^1.2.3). Visual breakdown of major.minor.patch. Local only.
UPC Barcode Validator - Online Check Digit & EAN
Enter a UPC or EAN barcode number and validate the check digit. See if it's a real product code. Local calculation.
DNSSEC Chain Validator - Online Check RRSIG & DS
Validate a DNSSEC chain by entering DS and RRSIG records. Verify that signatures match. Educational. Local algorithm.
TOML to YAML Converter - Online Config Translator
Convert TOML configuration files to equivalent YAML with perfect structure preservation. Fast and local.
ARIA Attribute Validator - Online Check HTML Accessibility
Paste an HTML snippet and check for common ARIA mistakes: missing labels, invalid roles, and aria‑hidden misuse. Educate your team.
Babel Config Generator - Online Presets & Plugins
Choose Babel presets (env, React, TypeScript) and plugins. Get a clean babel.config.json to transpile your code. Local tool.
DNS Record Syntax Checker - Online Validate BEFORE Publishing
Paste any DNS record and check if its format is valid for the selected record type (A, AAAA, CNAME, MX, TXT, SRV). Prevents typos.
SQL Syntax Validator - Online Quick Check
Paste your SQL query and check for basic syntax errors. Highlights missing commas, wrong keywords. Local analysis.
Nginx Config Generator - Online Reverse Proxy Setup
Build a basic Nginx server block for a static site, reverse proxy, or PHP. Fill in the blanks and copy the config.
Crypto Address Format Checker - Online Validate Wallet
Paste a Bitcoin, Ethereum, or other crypto wallet address and quickly verify its format and checksum. No connection to blockchain.
JSON to Properties File Converter - Online Java Config
Convert a flat JSON object into a Java .properties file format. Handle nested values by dot notation. Local only.
TOML Formatter & Validator - Online Config Tool
Check and beautify your TOML config files. Highlights errors and aligns tables and arrays. Safe local parsing.
YAML Validator & Formatter - Online Check Syntax
Validate YAML syntax with line‑by‑line error messages. Also format messy YAML into clean, indented output. All in your browser.
ISBN Validator - Online Check ISBN‑10 & ISBN‑13
Validate ISBN‑10 and ISBN‑13 numbers and compute their check digits. Useful for booksellers and libraries. All local.
JSON to .env Converter - Online Environment File Generator
Transform a flat JSON object into a dotenv file format instantly. Use it to keep your local configuration in sync. All processing is private and client‑side.
Test Credit Card Validator - Online Luhn Check & Issuer
Paste a test card number to verify Luhn algorithm, identify issuer (Visa, MC), and check length. No real data.
Web Server Log Parser - Online Apache/Nginx Analyzer
Paste a raw server log snippet and see a structured table with IP, method, URL, and status. Quick audit.
Semantic Versioning Validator - Check Semver Syntax
Validate if a version string follows SemVer 2.0.0. Also sort and compare versions. Developer tool.
Markdown Linter - Online Check Syntax & Style
Paste Markdown and get warnings for common mistakes: inconsistent heading spacing, bare URLs, and broken links. All local.
Robots.txt Validator - Online Check Syntax & Rules
Paste a robots.txt file and validate its syntax. See if a specific user‑agent can access a path. Essential for webmasters.
Base64 String Validator - Online Check Valid Encoding
Paste a string and verify if it is valid Base64. Auto‑detects padding issues and character errors. Quick dev check.
PRNG Validator - Online Check Randomness Pattern
Paste a list of numbers to visually check uniformity, mean, and simple pattern analysis. Educational tool for statistics and RNG.
.htaccess Password Generator - Online Apache Auth Creator
Generate encrypted passwords for .htaccess basic authentication. Create .htpasswd entries using bcrypt, MD5, or SHA. Server admin utility, local compute.