Developer Toolkit: Formatters, Encoders & Debuggers
Tired of opening 10 tabs for basic dev tasks? Format JSON, encode Base64, generate UUIDs, calculate chmod, and look up HTTP status codes — all in one place. Zero sign-up, all processed locally in your browser.
From debugging regular expressions to formatting minified code, we understand that workflow should be seamless. Kitmul offers deep technical utilities that integrate into your daily life so you can focus on creating.
Base64 Encoder/Decoder
Encode and decode text to Base64 format.
Chmod Calculator
Calculate Linux file permissions easily.
Generate Crontab Expressions
Build cron expressions visually with presets, human-readable explanations, and next run previews.
Generate Docker Compose Files
Build docker-compose.yml visually with service templates for Postgres, Redis, MongoDB, and more.
Generate .gitignore Files
Create .gitignore files by selecting from language, framework, IDE, and OS templates.
Hreflang Checker
Validate hreflang tags for international SEO. Check language codes, region codes, and x-default.
HTML Entity Converter
Convert special characters to HTML entities.
Convert HTML to JSX
Convert HTML to React JSX with automatic attribute conversion.
HTTP Status Codes
Quick reference for HTTP response codes.
Infrastructure Diagram
Design and visualize infrastructure architecture with an interactive isometric diagram editor.
JS Key Code Finder
Find JavaScript event key codes instantly.
JSON Formatter
Format, validate, and minify your JSON data.
Convert JSON to TypeScript Interfaces
Generate TypeScript interfaces from any JSON data instantly.
Meta Tag Inspector
Paste HTML and get a detailed analysis of all meta tags, Open Graph, Twitter Card, and SEO signals.
Mime Type Lookup
Lookup MIME types for file extensions.
Secure Password Generator
Generate strong, random passwords for your accounts.
Test & Explain Regular Expressions
Test regex patterns against text and get plain English explanations.
Robots.txt Validator
Validate your robots.txt file for syntax errors and SEO best practices.
Sitemap Validator
Validate XML sitemap syntax, check URL structure, and verify compliance with the sitemaps.org protocol.
Source Map Unpacker
Extract source files from a .map file and download as ZIP.
Format & Beautify SQL
Format, beautify, and minify SQL queries with multi-dialect support.
URL Encoder/Decoder
Safely encode or decode URLs for all browsers.
UUID/GUID Generator
Generate secure UUIDs (v1, v4, v7) instantly.
Average Rating
5.0
Total Votes
1
Rated Tools
1 / 23
Highest Rated
Convert JSON to TypeScript Interfaces
5.0 (1 reviews)
Find the tool you need
Regex testers, JSON formatters, URL encoders, diff viewers: the developer section covers the small tasks that interrupt your flow. Bookmark the ones you use most or pin them as favorites.
Paste your code or data
Every tool has a generous input area. Paste your minified JSON, your regex pattern, or your URL string. Syntax highlighting is available where it helps readability.
Get instant feedback
Results appear as you type. Regex testers highlight matches in real time; JSON formatters indent and colorize immediately. If something is wrong the error message tells you exactly which character caused the problem.
Copy and move on
One click copies the output. No sign-up walls, no rate limits, no ads covering half the screen. These tools exist to keep you in your flow state.
Junior Developers Learning the Ropes
Regex syntax, JSON structure, URL encoding rules: these are concepts that take time to master. Our tools show the result of your input in real time, which makes them excellent learning aids. Type a regex, see what it matches; paste malformed JSON, see where the error is.
Senior Engineers Saving Time
You know how URL encoding works. You do not need a tutorial. What you need is a fast tool that encodes the string and gives it back in one click. Our developer utilities strip away everything except the function. No tutorials, no sign-up walls; just the tool.
Technical Writers Formatting Code Samples
When you are writing documentation and need to show a properly formatted JSON payload or a decoded URL, these tools produce clean output you can paste directly into your docs.
| Tool | Best For |
|---|---|
| Base64 Encoder/Decoder | Encode and decode text to Base64 format. |
| Chmod Calculator | Calculate Linux file permissions easily. |
| Generate Crontab Expressions | Build cron expressions visually with presets, human-readable explanations, and next run previews. |
| Generate Docker Compose Files | Build docker-compose.yml visually with service templates for Postgres, Redis, MongoDB, and more. |
| Generate .gitignore Files | Create .gitignore files by selecting from language, framework, IDE, and OS templates. |
| Hreflang Checker | Validate hreflang tags for international SEO. Check language codes, region codes, and x-default. |
| HTML Entity Converter | Convert special characters to HTML entities. |
| Convert HTML to JSX | Convert HTML to React JSX with automatic attribute conversion. |
| HTTP Status Codes | Quick reference for HTTP response codes. |
| Infrastructure Diagram | Design and visualize infrastructure architecture with an interactive isometric diagram editor. |
| JS Key Code Finder | Find JavaScript event key codes instantly. |
| JSON Formatter | Format, validate, and minify your JSON data. |
| Convert JSON to TypeScript Interfaces | Generate TypeScript interfaces from any JSON data instantly. |
| Meta Tag Inspector | Paste HTML and get a detailed analysis of all meta tags, Open Graph, Twitter Card, and SEO signals. |
| Mime Type Lookup | Lookup MIME types for file extensions. |
| Secure Password Generator | Generate strong, random passwords for your accounts. |
| Test & Explain Regular Expressions | Test regex patterns against text and get plain English explanations. |
| Robots.txt Validator | Validate your robots.txt file for syntax errors and SEO best practices. |
| Sitemap Validator | Validate XML sitemap syntax, check URL structure, and verify compliance with the sitemaps.org protocol. |
| Source Map Unpacker | Extract source files from a .map file and download as ZIP. |
| Format & Beautify SQL | Format, beautify, and minify SQL queries with multi-dialect support. |
| URL Encoder/Decoder | Safely encode or decode URLs for all browsers. |
| UUID/GUID Generator | Generate secure UUIDs (v1, v4, v7) instantly. |
Yes; free, no sign-up, no rate limits. Use them as part of your daily workflow without worrying about quotas.
All processing is local. Your regex patterns, JSON payloads, and URL strings stay in your browser. We have no server-side processing for any developer tool.
Yes. The regex tester supports global, case-insensitive, multiline, dotall, and Unicode flags. Toggle them with checkboxes and see how matches change in real time.
The formatter handles files up to several megabytes comfortably. Beyond that, browser memory becomes a bottleneck. For very large JSON files, use a stream-based tool like jq.
Yes, but some tools like the diff viewer are more comfortable on wider screens. The interfaces are responsive and functional on any device.
Some tools encode their state in the URL hash so you can bookmark or share a specific configuration. Check if the URL changes when you modify settings; if it does, that URL is shareable.
Most tools support standard shortcuts like Ctrl+A to select all and Ctrl+C to copy. Some tools add custom shortcuts for common actions; hover over buttons to see tooltip hints.
Generate Crontab Expressions
Build cron expressions visually with presets, human-readable explanations, and next run previews.
Generate Docker Compose Files
Build docker-compose.yml visually with service templates for Postgres, Redis, MongoDB, and more.
Generate .gitignore Files
Create .gitignore files by selecting from language, framework, IDE, and OS templates.
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