Every developer has been there. You need to format some JSON, so you google "json formatter online." You pick one of the top results, close three popups, decline cookies, and finally paste your JSON into a tiny text box surrounded by ads.
I got tired of this, so I built FastDevKit — a single site with 199 free developer tools. No signup, no ads cluttering the interface, and everything runs client-side in your browser.
What's inside
Here's a sample of the tools available:
For everyday coding:
- JSON Formatter & Validator
- Base64 Encoder/Decoder
- UUID v4 Generator
- Regex Tester with explanations
- Diff Checker
- Markdown Preview
For frontend devs:
- Color Picker (HEX/RGB/HSL)
- CSS Minifier
- Tailwind Color Generator
- Flexbox Generator
- OG Image Preview
For backend/DevOps:
- JWT Decoder & Generator
- Hash Generator (SHA-256, MD5)
- Subnet Calculator
- Cron Expression Builder
- HTTP Status Code Reference
Calculators:
- Mortgage, Loan, Compound Interest
- BMI, Calorie, Body Fat
- Unit converters (temperature, weight, distance)
Why client-side matters
Every tool runs entirely in your browser. Your data never leaves your device. No server processing, no data collection, no "we may use your input to improve our services" nonsense.
4 languages
The whole site is available in English, Chinese, Japanese, and Korean. Developer tools shouldn't have a language barrier.
The tech
Built with Next.js 14, Tailwind CSS, deployed on Vercel. The entire site is open to suggestions — if there's a tool you wish existed, let me know in the comments.
Check it out: fastdevkit.com
What tools do you find yourself googling for most often? I'm always looking for ideas on what to add next.
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