As a developer working with APIs, configurations, and data formatting, you likely rely on various online tools daily. Switching between multiple tabs for JSON processing, timestamp conversion, and URL encoding disrupts workflow and wastes time. To streamline your development process, I created a clean, all-in-one toolkit designed for everyday coding tasks.
All tools are free, ad-free, no login required, with a responsive UI that works seamlessly on desktop and mobile.
Key Features
- JSON Formatter, Validator & Minifier
Format, validate, and minify JSON data for API development and debugging.
json
{ "tool": "json-processor", "functions": ["format", "validate", "minify"] }
- URL Encoder / Decoder & Parameter Parser
Encode, decode, and parse URL query strings for web development and API testing.
plaintext
Original: lumtool.com?tool=json&lang=中文 Encoded: lumtool.com?tool=json&lang=%E4%B8%AD%E6%96%87
- Timestamp ↔ Date Converter
Convert between Unix timestamps (seconds/milliseconds) and standard datetime formats.
plaintext
Timestamp: 1743321600000 DateTime: 2026-03-30 00:00:00
- Base64 Encode & Decode
Encode text and images to Base64 for frontend integration and data transmission.
plaintext
Text: developer-tool Base64: ZGV2ZWxvcGVyLXRvb2w=
- Markdown Editor with Live Preview
Write, preview, and export Markdown for documentation and technical writing.
markdown
Developer Toolkit
- Free & Open
- Responsive Design
- Full Feature Set
- Regex Tester & Debugger
Test, debug, and validate regular expressions for form validation and text matching.
regex
^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+.[a-zA-Z]{2,}$
- Text Diff Checker
Compare two text versions and highlight differences for code and content review.
plaintext
Text A: Online developer tool Text B: Free online developer tool
- Base Converter (Binary, Decimal, Hex, Octal)
Convert between binary, decimal, hexadecimal, and octal for programming and debugging.
plaintext
Decimal: 255 Binary: 11111111 Hex: FF
Optimize your daily workflow with one reliable toolkit: lumtool.com
Share with your team or bookmark for fast access in development, coding, and debugging.
