13 Essential Web Development Tools Every Developer Should Bookmark
13 free web development tools: meta tag generator, robots.txt builder, HTTP status codes, cURL to fetch converter, DNS checker, API key tester, GTM generator, and 5 security scanners.
13 Essential Web Development Tools Every Developer Should Bookmark
Published: May 14, 2025 | Author: Jay | Reading Time: 12 min read
Table of Contents
- Your Web Development Swiss Army Knife
- Meta Tag Generator
- robots.txt & sitemap.xml Generator
- HTTP Status Codes Reference
- cURL to Fetch Converter
- Code Obfuscator
- DNS & WHOIS Checker
- Bulk API Key Checker
- Google Tag Manager Generator
- Security Scanners (5 Tools)
- Comparison Table
- Frequently Asked Questions
- Conclusion
Your Web Development Swiss Army Knife
Web development requires a diverse set of tools that go beyond writing code. You need to generate meta tags for SEO, configure robots.txt files, understand HTTP status codes, convert cURL commands to JavaScript, check DNS records, test API keys, generate GTM configurations, and scan for security vulnerabilities.
Jayax.dev provides 13 essential web development tools in this category — covering everything from SEO fundamentals to security auditing. Every tool is free and runs in your browser.
Meta Tag Generator
What It Does
Generate HTML meta tags for your web pages. Meta tags provide information about your page to search engines and social media platforms.
Key Meta Tags
| Tag | Purpose | Example |
|-----|---------|---------|
| <title> | Browser tab title, search result title | "My Page Title — Brand Name" |
| <meta name="description"> | Search result snippet text | "A brief description of the page..." |
| <meta name="viewport"> | Mobile responsiveness | "width=device-width, initial-scale=1" |
| <meta name="robots"> | Search engine crawling instructions | "index, follow" |
| <meta property="og:title"> | Facebook/LinkedIn share title | "My Page Title" |
| <meta property="og:image"> | Social sharing image | "https://example.com/image.jpg" |
| <meta name="twitter:card"> | Twitter share format | "summary_large_image" |
| <link rel="canonical"> | Canonical URL | "https://example.com/page" |
When to Use It
- New pages — Generate complete meta tags for every new page
- SEO audits — Check that existing pages have all required meta tags
- Social sharing — Ensure Open Graph and Twitter Card tags are present
robots.txt & sitemap.xml Generator
→ Try robots.txt & sitemap.xml Generator
What It Does
Generate robots.txt and sitemap.xml files for your website. These files tell search engine crawlers which pages to index and which to skip.
robots.txt Basics
User-agent: *
Allow: /
Disallow: /admin/
Disallow: /private/
Sitemap: https://example.com/sitemap.xml
When to Use It
- New websites — Create robots.txt and sitemap.xml before launch
- SEO optimization — Ensure crawlers can find all your important pages
- Private areas — Block crawlers from admin panels, staging sites, and private content
HTTP Status Codes Reference
What It Does
A quick reference guide for HTTP response status codes organized by category.
Common Status Codes
| Code | Meaning | When You See It | |------|---------|-----------------| | 200 | OK | Request succeeded | | 301 | Moved Permanently | URL permanently redirected | | 302 | Found | Temporary redirect | | 304 | Not Modified | Cached version is still valid | | 400 | Bad Request | Invalid request syntax | | 401 | Unauthorized | Authentication required | | 403 | Forbidden | Access denied | | 404 | Not Found | Page does not exist | | 429 | Too Many Requests | Rate limit exceeded | | 500 | Internal Server Error | Server-side failure | | 502 | Bad Gateway | Upstream server error | | 503 | Service Unavailable | Server overloaded |
cURL to Fetch Converter
What It Does
Convert cURL commands to JavaScript fetch() API calls. Paste any cURL command and get equivalent JavaScript code.
Example Conversion
cURL input:
curl -X POST https://api.example.com/users \
-H "Content-Type: application/json" \
-H "Authorization: Bearer token123" \
-d '{"name": "John", "email": "john@example.com"}'
JavaScript fetch output:
fetch("https://api.example.com/users", {
method: "POST",
headers: {
"Content-Type": "application/json",
"Authorization": "Bearer token123"
},
body: JSON.stringify({
name: "John",
email: "john@example.com"
})
});
When to Use It
- API documentation — Convert cURL examples from docs to JavaScript
- Frontend development — Use fetch instead of cURL in browser code
- Learning — Understand how cURL flags map to fetch options
Code Obfuscator
What It Does
Obfuscate JavaScript code by renaming variables to random characters, making the code difficult to read and reverse-engineer while preserving functionality.
When to Use It
- Client-side code protection — Make it harder to copy or modify your JavaScript
- Intellectual property protection — Obfuscate proprietary algorithms
- License enforcement — Make it harder to remove license checks
Important Note
Obfuscation is not encryption. Determined developers can still reverse-engineer obfuscated code. Use it as a deterrent, not as a security measure.
DNS & WHOIS Checker
What It Does
Look up DNS records and WHOIS registration information for any domain.
DNS Record Types
| Type | Purpose | |------|---------| | A | Maps domain to IPv4 address | | AAAA | Maps domain to IPv6 address | | CNAME | Canonical name (alias) | | MX | Mail exchange server | | NS | Name server | | TXT | Text records (SPF, DKIM, verification) | | SOA | Start of authority |
When to Use It
- Domain troubleshooting — Check if DNS records are configured correctly
- Email delivery issues — Verify MX, SPF, and DKIM records
- Domain research — Check WHOIS information for domain ownership and expiration
Bulk API Key Checker
What It Does
Test and validate multiple AI API keys at once. Supports 6 major AI providers:
- OpenAI (GPT-4, GPT-3.5)
- Anthropic Claude
- Google Gemini
- Groq
- xAI (Grok)
- OpenRouter
Features
- Bulk testing — Check multiple keys simultaneously
- Status display — Valid, invalid, expired, or rate-limited
- Account info — Shows remaining credits and usage where available
- Local storage — Save keys in your browser for future checks
When to Use It
- Key management — Verify which API keys are still active
- Team management — Check keys across multiple accounts
- Cost monitoring — Track remaining credits across providers
Google Tag Manager Generator
What It Does
An AI-powered tool that generates Google Tag Manager configurations. Describe your tracking needs in plain English and get ready-to-implement GTM tags, triggers, and variables.
Preset Templates
- GA4 Configuration
- GA4 Event Tracking
- Facebook Pixel
- Google Ads Conversion
- LinkedIn Insight Tag
- TikTok Pixel
- Custom HTML
- Scroll Depth Tracking
- Click Tracking
- Form Submission Tracking
How to Use It
- Select a preset template or describe your tracking need
- Configure the parameters (Measurement ID, Pixel ID, etc.)
- Generate the GTM configuration
- Copy the configuration into your GTM container
Security Scanners (5 Tools)
Jayax.dev offers 5 specialized security scanners for different technology stacks:
WordPress Security Checker
Scans WordPress sites for version vulnerabilities, exposed files, missing headers, and plugin issues.
Laravel Security Checker
Scans Laravel apps for .env exposure, debug mode, missing headers, and framework-specific vulnerabilities.
Next.js Security Checker
Scans Next.js apps for build directory exposure, API route issues, CORS misconfigurations, and header problems.
Website Security Checker
Universal scanner for any website — checks SSL, headers, common vulnerabilities, and information disclosure.
React Security Checker
Scans React apps for source map exposure, XSS risks, CORS issues, and CSP misconfigurations.
Comparison Table
| Tool | Category | Input | Output | Link | |------|----------|-------|--------|------| | Meta Tag Generator | SEO | Page info | HTML meta tags | Try → | | robots.txt Generator | SEO | Rules | Config files | Try → | | HTTP Status Codes | Reference | N/A | Status lookup | Try → | | cURL → Fetch | Conversion | cURL command | JS fetch code | Try → | | Code Obfuscator | Protection | JS code | Obfuscated code | Try → | | DNS & WHOIS | Networking | Domain | DNS/WHOIS data | Try → | | Bulk API Checker | Testing | API keys | Validation results | Try → | | GTM Generator | Analytics | Description | GTM config | Try → | | WP Security | Security | URL | Vulnerability report | Try → | | Laravel Security | Security | URL | Vulnerability report | Try → | | Next.js Security | Security | URL | Vulnerability report | Try → | | Website Security | Security | URL | Vulnerability report | Try → | | React Security | Security | URL | Vulnerability report | Try → |
Frequently Asked Questions
Are all 13 web development tools free? Yes, every tool is 100% free with no account required, no usage limits, and no hidden fees.
Do the security scanners attempt to hack my website? No. All security scanners perform non-invasive checks from the outside. They detect the presence of vulnerabilities but do not attempt to exploit them. Think of it as checking if your doors are locked, not trying to break in.
What is the difference between the GTM Generator and manual GTM setup? The GTM Generator creates configurations faster by using AI to understand your tracking needs. Instead of navigating GTM's interface to create tags, triggers, and variables manually, you describe what you want and get the configuration ready to implement.
Can I use the cURL to Fetch converter for complex requests? Yes, the converter handles headers, request bodies, authentication, cookies, and most cURL flags. For very complex cURL commands with custom DNS resolution or proxy settings, some manual adjustment may be needed.
How accurate is the DNS & WHOIS checker? DNS lookups query live DNS servers, so results are always current. WHOIS data accuracy depends on the domain registrar — some registrars hide owner information due to privacy regulations like GDPR.
What does code obfuscation protect against? Obfuscation makes code harder to read and understand, which deters casual copying and modification. It does not provide cryptographic security — a determined reverse engineer can still analyze obfuscated code.
Can I check API keys for providers not listed? Currently, the Bulk API Checker supports OpenAI, Claude, Gemini, Groq, xAI, and OpenRouter. Additional providers may be added in the future.
How often should I run security scans? For production websites, run security scans at least weekly. After any deployment or configuration change, run an immediate scan. For development/staging environments, scan before each production deployment.
Conclusion
Web development involves dozens of tasks beyond writing code. The 13 free web development tools on Jayax.dev cover SEO setup, code conversion, DNS lookup, API testing, analytics configuration, and security scanning — all the essentials for building, deploying, and maintaining modern websites.
Start using these essential tools:
- 🏷️ Generate meta tags → Meta Tag Generator
- 🤖 Create robots.txt → robots.txt Generator
- 🔄 Convert cURL to fetch → cURL → Fetch
- 🌍 Check DNS records → DNS Checker
- 🔑 Test API keys → Bulk API Checker
- 🏷️ Generate GTM configs → GTM Generator
- 🛡️ Scan for vulnerabilities → Security Checkers
Explore all 103+ free tools at Jayax.dev/tools.
Need professional web development or security services? We offer website development and SEO maintenance based in Bali. Contact us to discuss your project.
