N4R (n4r.org) Developer Portal

Free Online
Developer Tools & Tech Audits

N4R (n4r.org) delivers ultra-fast, privacy-first developer utilities, real-time website technology stack detection, JSON formatting, DNS diagnostics, and web audits.

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Free Web Tools
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Live Tech Profiles
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Developer Utilities

Explore high-performance tools built for software engineers and sysadmins.

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JSON Formatter

Prettify, validate, and minify your JSON data with ease.

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Base64 Encoder

Quickly encode and decode text to/from Base64 format.

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DNS Lookup

Check DNS records (A, MX, TXT, etc.) for any domain.

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Hash Generator

Generate secure MD5, SHA256 and CRC32 hashes.

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Password Generator

Create ultra-secure, random passwords instantly.

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Text Case Converter

Convert text case and get word/character counts.

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HTTP Headers

Analyze server response headers for any URL.

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Port Scanner

Check if common server ports are open and reachable.

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Reverse DNS

Find the hostname associated with any IP address.

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Laravel Key Gen

Generate secure APP_KEY for your Laravel applications.

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Site Audit

Analyze your website for SEO and optimization issues.

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VAT Calculator

Calculate VAT included and excluded amounts instantly.

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Percentage Calculator

Calculate percentage increase, decrease, and ratios quickly.

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SSL Checker

Check SSL certificate expiration, issuer and technical details.

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Whois Lookup

Lookup domain registration details and expiration dates.

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IP Info

Check your public IP, location, and browser details.

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Unix Timestamp

Convert Unix timestamps to human-readable dates and vice versa.

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QR Generator

Create custom QR codes for links, text, or Wi-Fi.

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URL Encoder

Encode and decode URLs and query parameters safely.

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HTML Entities

Convert special characters to HTML entities and vice versa.

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JSON Converter

Convert JSON to PHP Array or TypeScript interfaces.

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Cron Generator

Create cron job expressions with a simple visual interface.

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Regex Tester

Test your regular expressions against sample text in real-time.

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Lorem Ipsum

Generate placeholder text for your designs and layouts.

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Bcrypt Tool

Generate and verify Bcrypt hashes for secure password storage.

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Markdown Tool

Convert Markdown to clean HTML with real-time preview.

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CSV JSON Tool

Convert between CSV and JSON formats effortlessly.

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Image to WebP

Convert JPG and PNG images to modern WebP format.

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Image Compressor

Reduce image file size while maintaining quality.

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Diff Checker

Compare two snippets of code or text with side-by-side highlighting.

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Subdomain Scanner

Discover all active subdomains and DNS records for any domain name.

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Schema Generator

Generate JSON-LD structured data for Google Rich Results and SEO.

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JWT Debugger

Decode, encode and verify JSON Web Tokens (JWT) in real-time.

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YAML JSON Converter

Seamlessly convert between YAML and JSON formats with validation.

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Meta Tag Generator

Generate and preview Social Media Open Graph and Twitter meta tags.

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UUID Generator

Generate Version 4 and Version 1 UUIDs (GUIDs) in bulk.

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Code Minifier

Compress and optimize your HTML, CSS, and JS code for performance.

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Redirect Checker

Trace the full path of any URL redirect chain and HTTP status codes.

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Color Picker

Professional color selector with format conversion and palette generator.

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Gradient Generator

Create beautiful CSS linear and radial gradients with multi-stop control.

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Website Tech Scan

Discover what technologies, frameworks, and web engines a website is running.

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Programmatic Tech Stack Directory

Explore Website Tech Profiles

Discover technology stacks powering thousands of real-world websites. Search CMS platforms (WHMCS, WooCommerce, WordPress), web servers (Nginx, LiteSpeed, Cloudflare), and frameworks (Laravel, Next.js, React).

Whmcs Woocommerce Laravel Wordpress Nginx Cloudflare React Next.js
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100+
Live Verified Profiles
Authentic HTTP & header signatures recorded in real-time.

Engineering Guides & Research

In-depth technical articles on web security, DNS, and architecture.

Web Development Aug 09, 2026

How to Analyze Any Website Tech Stack: Full Reverse Engineering Guide

Learn how to reverse engineer and audit any website's technology stack. Detect web servers, CMS platforms like WordPress and WHMCS, frontend frameworks, and CDNs.

Read Full Article →
Security Aug 08, 2026

JSON Formatter Security: Why Client-Side Validation Protects API Keys

Discover why serverless, client-side JSON formatting tools are essential for preventing API credential leaks, payload tampering, and data privacy compliance issues.

Read Full Article →

Why Software Engineers Choose N4R (n4r.org)

N4R (n4r.org) is an independent, global developer portal engineered to provide free, high-performance web utilities for software engineers, DevOps specialists, cybersecurity auditors, and web agencies.

100% Privacy & Security

Formatting confidential JSON strings, evaluating code snippets, or hashing credentials happens directly inside your web browser. N4R never stores or transmits sensitive developer data to external backend loggers.

Real-Time Diagnostics

From instant DNS A/MX lookup checks to real-time website technology stack reverse engineering, N4R tools deliver zero-latency diagnostic intelligence for web applications worldwide.