Developer & SEO Utilities
High-Precision Utilities for Web Developers, Engineers & Technical SEO Specialists
Test regular expressions, decode JWT tokens, inspect HTTP status codes, format SQL, generate XML sitemaps, build UTM links, and simulate Google SERP snippets.
Available Tools in Developer & SEO Utilities
Click any tool below to launch instantly in your web browser.
QR Code Generator
Create customized, high-resolution QR codes for websites, text, and Wi-Fi credentials.
JSON Formatter & Validator
Format, beautify, validate, minify, and inspect JSON payloads with line-by-line syntax error detection.
Base64 Encode/Decode
Encode raw text to Base64 format or decode Base64 strings back to clean UTF-8 safely and securely.
URL Encoder/Decoder
Encode strings into percent-encoded URI format or decode complex URLs and query strings safely.
Hash Generator
Generate SHA-1, SHA-256, SHA-384, SHA-512, and MD5 cryptographic hashes from any input text.
UUID Generator
Generate cryptographically secure Version 4 UUIDs in bulk with uppercase, lowercase, and hyphen options.
Password Generator
Generate ultra-secure, random passwords with custom length, symbols, numbers, and entropy meter.
JWT Decoder
Decode and inspect JSON Web Tokens (Header, Payload, Signature) with expiration validity verification.
Regex Tester
Test regular expressions with real-time match highlighting, flag toggles (g, i, m, s), and error warnings.
Diff Checker
Compare two text snippets side-by-side with line-by-line difference highlighting and character diffs.
SSL Certificate Health Checker
Verify SSL/TLS certificate validity, issuer trust chains, expiry alerts, and cipher security.
HTML Beautifier/Minifier
Format messy HTML markup with clean indentation or minify production code by stripping whitespace.
CSS Beautifier/Minifier
Beautify stylesheets with consistent formatting or compress stylesheets for lightning-fast web delivery.
JavaScript Beautifier/Minifier
Clean up and indent complex JavaScript code or minify scripts for production deployment.
SQL Formatter
Format SQL queries with capitalized keywords and clean clause indentation for readability.
XML Formatter
Format XML tree documents with customizable indentation and instant syntax validation.
JSON to CSV Converter
Convert JSON arrays and objects into clean CSV spreadsheets with custom delimiter and column mapping.
Markdown ↔ HTML
Convert Markdown to clean HTML or convert HTML into formatted Markdown with live split-screen preview.
Lorem Ipsum Generator
Generate dummy placeholder text by paragraphs, sentences, or word counts for design mockups.
Code to Image
Create beautiful, shareable code snippet cards with syntax highlighting, window frames, and PNG export.
Timestamp Converter
Convert Unix epoch timestamps to human-readable ISO/UTC dates and convert calendar dates to epoch seconds.
Unit Converter (px/rem/em)
Convert units seamlessly between pixels (px), rem, em, percentage (%), and points (pt) with custom base.
Color Converter
Convert colors bidirectionally between HEX, RGB, RGBA, HSL, HSLA, CMYK, and HSV formats.
Meta Tags Generator
Generate complete HTML meta tags, Open Graph, and Twitter Cards with live Google search preview.
Robots.txt Generator
Create standard robots.txt files with custom user-agents, allow/disallow directives, and sitemaps.
XML Sitemap Generator
Generate search-engine-ready XML sitemaps with custom page priorities and change frequencies.
UTM Builder
Construct tracking URLs with campaign source, medium, name, term, and content parameters.
Open Graph Preview
Simulate how web links appear across Twitter, Facebook, LinkedIn, Google SERP, and WhatsApp.
Keyword Density Checker
Analyze content for primary keyword frequency, 2-word, and 3-word n-gram density percentages.
HTTP Status Codes Lookup
Comprehensive reference and search tool for HTTP 1xx, 2xx, 3xx, 4xx, and 5xx response status codes.
Canonical Tag Checker
Inspect and validate canonical link tags to avoid search engine duplicate content penalties.
SERP Snippet Preview
Preview how your title and meta description will render in Google desktop and mobile search engine results.
Schema Markup Generator
Build Article, Product, Organization, and FAQ Schema.org JSON-LD structured data snippets.
CSS to Tailwind Converter
Convert standard CSS properties and rules into modern utility-first Tailwind CSS classes automatically.
HTML Entity Encoder/Decoder
Safely encode special HTML characters to prevent XSS or decode entities back to readable text.
Cron Expression Explainer & Generator
Build standard 5-part cron schedules and translate cryptic cron syntax into plain human language.
Rank Tracker
Track organic keyword ranking positions across Google, Bing, and mobile search results.
Backlink Checker
Inspect inbound referring domains, anchor text distribution, and toxic links for any domain.
Full Site Audit
Audit Core Web Vitals, broken internal links, crawl budget, and schema health.
Keyword Research Tool
Uncover search volume, CPC estimates, and keyword difficulty for organic SEO campaigns.
Screen Recorder
Capture browser tabs, application windows, or desktop screens with microphone voiceovers.
Online Code Editor
In-browser live sandbox with multi-language syntax highlighting and package compilation.
API Tester
Postman-alternative browser HTTP client for testing REST, GraphQL, and WebSocket endpoints.
Website Speed & Core Web Vitals Audit
Benchmark Largest Contentful Paint, CLS, and page load speed with actionable fixes.
Broken Link Checker
Crawl web pages to detect dead 404 links, redirect loops, and server timeouts.
DNS Records Lookup Tool
Inspect A, AAAA, MX, TXT, CNAME, and NS DNS records across authoritative nameservers.
WHOIS Domain & IP Checker
Inspect domain registration dates, registrar details, and expiration countdowns.
Subdomain Scanner & Finder
Discover hidden subdomains and DNS asset mappings for security auditing.
API Mock Server
Simulate REST and GraphQL endpoints with custom JSON responses and status codes.
GraphQL Query Builder
Visually build, inspect, and test GraphQL queries, mutations, and variables.
Dockerfile Generator
Generate production-ready multi-stage Dockerfiles for Node.js, Python, Go, and Rust.
Kubernetes YAML Validator
Validate and lint Kubernetes manifests, deployments, and services against K8s schemas.
About Developer & SEO Utilities on Zoqonyx
Key Advantages & Architectural Features
Offline-First Execution
Tools run instantly with zero network round-trip overhead.
Security for Secrets
Decode JWTs and inspect JSON payloads without exposing private API keys or customer data.
Technical SEO Precision
Generate XML sitemaps, validate canonical tags, and build trackable UTM parameters.
Cross-Language Compatibility
Format SQL, HTML, CSS, JavaScript, and XML with standard conventions.
Popular Workflows & Best Practices
API Authentication Debugging
- Paste JWT token
- Inspect header algorithm & expiration
- Verify claims
Technical SEO Campaign Setup
- Build UTM parameter link
- Verify canonical tag
- Generate XML sitemap
Frequently Asked Questions
Common questions about Developer & SEO Utilities and how our tools work.
Q:Are decoded JWT tokens logged on your server?
Never. The JWT decoder runs purely through JavaScript atob and JSON.parse in your browser tab.
Q:Do the SEO tools conform to official Google guidelines?
Yes, our Schema generators and SERP snippet previews follow schema.org and Google Search Central specifications.