Development Tools
Browse our free collection of development tools. All tools run locally in your browser for maximum privacy.
Bundle Size Analyzer
Upload stats.json and inspect top assets by size.
CORS Header Checker
Inspect CORS headers via fetch or pasted response.
Development Tools are the daily-driver utilities every engineer reaches for, parsing environment files, generating READMEs, converting between config formats, and scaffolding project boilerplate. If you write code, ship code, or review code, this category covers the friction between 'it works on my machine' and 'it works in production.'
Common Workflows & Recommended Tools
Audit and refactor a sprawling .env file with 80+ variables
→ .env File ParserGenerate a professional GitHub README from a structured form
→ README.md GeneratorConvert a JSON API response into TypeScript interfaces
→ JSON to TypeScriptExtract specific fields from a nested JSON payload
→ JSONPath TesterConvert between JSON, CSV, and shell export formats
→ JSON ↔ CSV ConverterCommon Mistakes to Avoid
- ✗Committing .env files to git and assuming git filter-repo removes the secrets, every clone already has them permanently.
- ✗Generating TypeScript interfaces from a single API response and assuming every field is required, real traffic includes optional keys.
- ✗Using JSONPath when you actually need JMESPath, AWS CLI and kubectl use different query languages with overlapping syntax.
Privacy-First by Design
Every tool in this category runs entirely in your browser. Your .env files, API responses, and project configs never leave your machine, critical when working with credentials, PII, or NDA-bound payloads.
Frequently Asked Questions
Are these development tools free to use?
Yes, all tools are free, require no account, and run locally in your browser with no data uploaded to any server.
Can I use these tools with sensitive data like API keys?
Yes. All processing happens client-side. Your .env files, JSON payloads, and credentials never leave your browser.
Do these tools work offline?
Once the page loads, all processing is local. You do not need an active internet connection for the tools to function.