Developer Utilities
Utilities for developers and technical workflows. Everyday developer essentials for formatting code payloads, inspecting web tokens, decoding URIs, and testing regular expressions quickly.
Status: 40 Live Utilities Active
This category currently features 40 live operational utilities. Additional specialized tools are scheduled in our engineering queue.
JSON Formatter and Validator
Format, validate, repair syntax errors, sort keys, and minify JSON with real-time structural telemetry.
Base64 Encoder Decoder Online
Encode plain text and binary files to Base64, decode Base64 strings, convert to Hex, and generate URL-safe tokens in real time.
HTTP Status Code Lookup
Searchable directory and troubleshooting guide for RFC 9110 HTTP status codes, headers, and reverse proxy errors.
URL Encoder Decoder Online
Encode and decode URLs, percent-encode query parameters under RFC 3986, and edit query strings with live parameter tables.
Cryptographic Hash Generator (SHA-256, MD5, HMAC & Checksum)
Generate SHA-256, MD5, SHA-512, SHA-384, and SHA-1 cryptographic hashes, compute HMAC digests, and verify zero-upload file checksums.
UUID & GUID Generator (v4, v7, v1 Bulk)
Generate cryptographically secure random RFC 4122 v4, time-ordered RFC 9562 v7, and v1 UUIDs in bulk. Format with hyphens, braces, quotes, or JSON, and inspect structure.
HTML Entity Encoder & Decoder (Named, Decimal, Hex)
Encode and decode HTML special characters into named entities, decimal character references, or hexadecimal codes. Prevent XSS and format code snippets with full HTML5 entity support.
JSON Web Token (JWT) Decoder
Decode and inspect JSON Web Token headers, payload claims, and expiration timestamps locally without sending secrets over the network.
Cron Expression Generator & Crontab Schedule Explainer
Translate 5-field and 6-field cron schedule expressions into plain English descriptions and preview upcoming execution times.
Linux Chmod Permissions Calculator
Calculate Linux file permissions in octal (755, 644) and symbolic notation (rwxr-xr-x) with interactive checkboxes.
IP Address, Geolocation, ASN & Whois Inspector
Inspect public and local IP addresses with zero-network RFC scope classification, binary/hex notation, reverse DNS PTR generation, and public geolocation.
Browser and User-Agent Inspector
Inspect current browser telemetry or parse custom User-Agent strings to identify browsers, rendering engines, operating systems, hardware concurrency, and search bots.
MAC Address Generator
Generate valid unicast or multicast IEEE 802 MAC addresses with vendor OUI presets, customizable delimiters, bitmask controls, and real-time OUI inspection.
Strong Random Password Generator
Generate cryptographically strong, customizable passwords using native browser entropy with password strength evaluation.
Memorable Passphrase Generator
Generate secure, memorable multi-word passphrases based on Diceware principles and the EFF long wordlist.
Interactive QR Code Generator
Generate customizable QR codes for website URLs, Wi-Fi connections, plain text, and contact details with instant SVG and PNG export.
Regex Tester
Test JavaScript regular expressions in real time with syntax match highlighting and capture group tables.
cURL to Fetch Converter
Convert shell cURL terminal commands into modern JavaScript async/await fetch() code snippets.
SQL Formatter
Format, indent, and beautify SQL queries with consistent keyword capitalization across SQL dialects.
XML Formatter
Beautify, indent, or minify XML markup and SVG code with schema validation and tag hierarchy display.
HTML Table Generator
Design data tables in an interactive spreadsheet grid and export clean semantic HTML or Markdown tables.
GitHub User Finder
Inspect public developer profiles, public repository counts, follower metrics, and account details in real time.
GitHub Repo Analyzer
Analyze public open source code repositories for star counts, fork activity, open issues, and primary languages.
DNS Lookup & Multi-Nameserver Propagation Checker (A, MX, TXT, CNAME, NS)
Resolve and audit DNS records including A, AAAA, MX, TXT, CNAME, and NS records with authoritative TTL values.
HTTP Headers Checker
Inspect HTTP response headers, security headers, content encodings, and server configurations for any URL.
NPM Package Inspector and Version Analyzer
Inspect package versions, open-source licenses, dependency counts, and install commands from the npm registry.
CDN Script Library and CDNJS Package Finder
Search open-source web libraries and copy production-ready CDN script or link tags with one click.
GitLab Repository and Code Search Explorer
Search open-source projects, star ratings, and repositories hosted on the public GitLab platform.
Cloudflare Trace Inspector
Inspect edge network routing, client IP address, data center colo codes, TLS version, and HTTP protocol metrics in real time.
HTTP Echo Console
Echo and inspect incoming client HTTP headers, connection attributes, origin IP address, and payload signatures.
Test Public DNS Servers
Query public DNS records including A, AAAA, MX, TXT, and NS records with live nameserver verification.
HAR to cURL Converter
Inspect HTTP Archive (HAR) files locally, sanitize authentication tokens and cookies, analyze network requests, and convert requests to cURL commands.
CSP Header Generator
Build and validate Content Security Policy (CSP) headers and meta tags. Configure directives for scripts, styles, frames, and images with trusted service presets.
Subnet Calculator
Interactive IPv4 subnet and CIDR mask calculator. Visualize 32-bit network and host binary boundaries, calculate usable IP ranges, broadcast addresses, and subnet masks.
Mock Data Generator
Free online mock data generator and dummy test data maker. Create realistic user profiles, schemas, and records exported as JSON, CSV, or SQL INSERT queries.
Code to Image Converter
Free online code to image converter and aesthetic code snippet screenshot generator. Create beautiful, high-resolution code graphics with macOS window headers, custom gradients, and syntax themes.
Docker Run to Compose Converter
Convert docker run CLI commands into clean docker-compose.yml files and decompose Compose YAML back into docker run one-liners. 100% in-browser, bidirectional, and private.
Gerador e Validador de CPF e CNPJ (com Pontuação e Estados)
Generate and validate Brazilian CPF and CNPJ document numbers with optional formatting punctuation, state origins, and bulk export for software testing.
LLM GPU VRAM & Hardware Sizing Calculator (Llama 3, DeepSeek, MoE)
Calculate exact GPU VRAM requirements, KV cache scaling, and tokens-per-second hardware fit for open-weight LLMs across FP16, FP8, INT4, and GGUF quantizations.
Bcrypt Hash Generator & Password Verifier (Custom Salt Rounds)
Generate cryptographically secure bcrypt password hashes with adjustable work factor cost and verify plaintext passwords against existing bcrypt hashes.
Core Focus Areas
Key workflows addressed within Developer utilities.
JSON formatting, validation, and tree inspection
Base64 encoding and decoding
URL component encoding and parameter parsing
Hash generation (SHA-256, MD5, SHA-512)
Related Utility Categories
Explore sister categories that complement developer workflows.