Developer tools, simplified.
Free browser-based utilities for engineers. Instant results, complete privacy, zero server uploads.
Popular Developer Tools
Bundle Size Analyzer
Upload stats.json and inspect top assets by size.
CORS Header Checker
Inspect CORS headers via fetch or pasted response.
JSON to TypeScript
Convert JSON objects into TypeScript interfaces instantly.
MongoDB Query Builder
Visually build MongoDB queries and aggregation pipelines.
Gateway Hubs
Specialized command centers grouping related utilities, technical glossaries, and comparative guides for professional workflows.
JSON & Data Transformation Hub
The complete collection of browser-based tools for formatting, minifying, converting, and analyzing JSON and data structures. All processing happens locally on your device for maximum privacy.
Web Security & Cryptography Hub
A comprehensive suite of cryptography and security utilities. Generate strong passwords, RSA keys, Bcrypt hashes, and decode JWTs safely. Zero data is ever sent to our servers.
Database & Schema Hub
Utilities for database developers and administrators. Test SQL queries in-browser, format complex SQL statements, and generate unique database identifiers.
CSS & Design Engineering Hub
Visual tools for modern web design. Generate complex CSS gradients, shadows, and layouts interactively, then copy the production-ready code with one click.
AI & Prompt Engineering Hub
The essential toolkit for AI engineers and prompt designers. Calculate tokens for GPT-4 and Claude, analyze prompt costs, and generate system prompts with precision.
DevOps & Cloud Infrastructure Hub
Streamline your infrastructure workflows with tools for Docker, Kubernetes, and network diagnostics. Validate configurations and generate boilerplate safely.
We test it ourselves, then publish the data
Hands-on benchmarks and compatibility tests with reproducible methodology. Raw data and scripts linked in each article.
AES Interoperability Across 7 Libraries
Encrypted the same plaintext with 7 libraries across 5 languages. 42 of 49 cross-language pairs worked. The 7 failures traced to 3 root causes.
JavaScript JSON Parser Benchmark
6 parsing methods tested from 1 KB to 50 MB. JSON.parse wins under 10 MB. Streaming parsers only pay off above 50 MB.
JWT Failure Modes: 200 Malformed Tokens
Fed 200 malformed JWTs to 5 libraries. 3 accepted tokens they should have rejected. All current versions block the classic alg:none attack.
Regex Engine Comparison: JS vs PCRE vs Python
12 patterns tested in 3 engines. 6 produced different results across engines. Lookbehind, Unicode properties, and nested quantifiers diverge.
LLM Context Window Needle Test
Hid facts at 10K, 50K, and 100K tokens in GPT-4o, Claude, and Gemini. All models show a "lost in the middle" effect at 100K depth.
Web Crypto API Speed Test: AES, PBKDF2, RSA
Benchmarked AES-GCM, AES-CBC, PBKDF2, and RSA key generation across Chrome, Firefox, and Safari. AES-GCM is near-instant everywhere; PBKDF2 runs 3-5x slower on Firefox.
We Audited 10 Online JSON Formatters
Monitored the network traffic of 10 popular online JSON formatters. 4 upload your JSON to their servers despite "privacy-first" claims; only 6 make zero outbound requests.
CORS Errors Explained: Every Fix, Every Framework
Reproduced 12 real CORS failure scenarios across Express, Fastify, and Nginx. Documents the exact header combinations that fix each one, with framework-specific config snippets.
View all research
7 original benchmarks, plus in-depth guides
Educational Resources
Deepen your technical knowledge with our curated engineering libraries and guides.
HTTP Headers Reference
Every standard request and response header, what it does, which RFC defines it, and the security headers you should be sending.
Developer Journal
In-depth technical articles on privacy-first engineering, cryptography, Web Crypto API, and web performance.