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Practical code notes, tools, and guided learning for developers.

Practical guides, developer tools, and tutorials for modern web developers, with the same focused tone across writing, utilities, and learning tracks.

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Tool Index

Utilities for the Technical Workflow

Practical tools for formatting, converting, generating, testing, and checking the small things that slow real work down.

Tool Inventory

85

tools across 12 categories

3 new

Type Generator17Dev Utility14Code Converter10SEO Tool9Visual Tool9Generator7Financial Tool4Format Converter4Accessibility3Productivity3Text Tool3Analyzer2

17 tools

Type Generator

JSON to Go Struct

Transform JSON into Go struct types.

JSON to Kotlin Data Class

Convert JSON into Kotlin data classes.

JSON to Rust Struct

Convert JSON to Rust structs.

JSON to TypeScript Interface

Auto-generate interfaces from JSON.

JSON to C# Class

Convert JSON to C# classes.

YAML to Go Struct

Generate Go structs from YAML files.

YAML to Kotlin Data Class

Convert YAML to Kotlin data classes.

YAML to Rust Struct

Create Rust structs from YAML.

YAML to TypeScript Interface

Generate TypeScript interfaces from YAML.

XML to Go Struct

Parse XML and generate Go structs.

XML to Kotlin Data Class

Generate Kotlin classes from XML.

XML to Rust Struct

Convert XML to Rust structs.

XML to TypeScript Interface

Generate TypeScript types from XML.

CSV to Go Struct

Convert CSV headers into Go structs.

CSV to Kotlin Data Class

Convert CSV into Kotlin data classes.

CSV to Rust Struct

Generate Rust structs from CSV.

CSV to TypeScript Interface

Generate TypeScript types from CSV.

14 tools

Dev Utility

API Request Builder

Build and test REST API requests in-browser.

Unix Timestamp Converter (Epoch ↔ Date)

Convert Unix epoch timestamps to readable dates with timezone-aware outputs.

URL Encoder / Decoder

Encode or decode URLs safely.

Markdown Previewer

Live preview for Markdown documents.

Hash Generator

Generate MD5, SHA1, SHA256 hashes from strings.

Cron Expression Generator

Build and validate cron expressions with schedule previews.

JWT Decoder

Decode and inspect JWT tokens instantly.

Base64 Encoder / Decoder

Encode or decode base64 strings.

HTTP Status Checker

Check HTTP status codes for any URL.

JSON Formatter

Prettify and validate JSON data.

Code Formatter & Beautifier

Format and beautify HTML, CSS, and JavaScript code.

Regex Tester

Test and debug regular expressions with live matching.

Unit Converter

Convert length, weight, temperature, and more.

SQL Formatter & Beautifier

Format and beautify SQL queries online.

10 tools

Code Converter

CSV to XML

Convert CSV rows into XML format.

CSV to YAML

Convert CSV into YAML.

JSON to XML

Convert JSON into XML structure.

JSON to YAML

Convert JSON into YAML format.

XML to CSV

Flatten XML data into CSV format.

XML to JSON

Convert XML to structured JSON.

XML to YAML

Transform XML to readable YAML.

YAML to CSV

Flatten YAML into CSV rows.

YAML to JSON

Convert YAML to standard JSON.

YAML to XML

Convert YAML to structured XML.

9 tools

SEO Tool

SERP Snippet Preview

Preview how your page looks in Google search.

Meta Tag Generator

Generate SEO-friendly meta tags for HTML pages.

Robots.txt Generator

Generate robots.txt with Allow/Disallow, Crawl-delay, Sitemap directives.

XML Sitemap Generator

Create and download sitemap.xml for your website.

SEO URL Checker

Check URLs for SEO best practices.

New

Schema Markup Generator

Generate JSON-LD schema markup for better search results.

New

Keyword Density Analyzer

Analyze keyword density and distribution in your content.

New

Meta Description Generator

Generate compelling meta descriptions for your pages.

Domain Age Checker

Check domain registration date and age.

9 tools

Visual Tool

CSS Gradient Generator

Design linear or radial gradients visually.

Box Shadow Generator

Build CSS box-shadow visually.

Color Format Converter

Convert HEX, RGB, HSL color values.

Flexbox Generator

Visually build CSS flexbox layouts.

SVG Wave Generator

Create smooth SVG wave patterns.

CSS Grid Generator

Build responsive CSS grid layouts visually.

Image Resizer & Compressor

Resize and compress images in the browser.

Color Palette Generator

Create beautiful color schemes and palettes.

Tailwind CSS Class Generator

Visual utility class builder for Tailwind CSS.

7 tools

Generator

UUID Generator

Generate random UUID v4 strings.

Lorem Ipsum Generator

Generate filler text for design mockups.

QR Code Generator

Generate scannable QR codes from text or URL.

Favicon Generator

Create favicon icons from images or text.

Password Generator

Generate strong and secure passwords.

Age Calculator

Calculate your exact age in years, months, and days.

Random Number Generator

Generate random numbers within any range.

4 tools

Financial Tool

Percentage Calculator

Calculate percentages online — increase, decrease, difference.

Mortgage Calculator

Calculate monthly mortgage payments and total interest.

Property Tax Calculator

Estimate annual property taxes based on value and rate.

Budget Calculator

Plan monthly budget and track expenses.

4 tools

Format Converter

Image to Base64 Converter

Convert image files into base64 strings.

CSV to JSON Converter

Convert CSV data to structured JSON.

JSON to CSV Converter

Transform JSON arrays into CSV format.

JSON ↔ YAML Converter

Convert between JSON and YAML formats.

3 tools

Accessibility

Color Contrast Checker

Check WCAG contrast ratio between two colors.

Keyboard Navigation Test

Test accessibility using keyboard-only input.

Image Accessibility Checker

Verify if images have proper alt text.

3 tools

Productivity

Pomodoro Timer

Focus timer for productivity with work/break intervals.

Online Stopwatch

Lap timer and countdown stopwatch.

Event Countdown Creator

Create countdown timers for birthdays, anniversaries, and events.

3 tools

Text Tool

Case Converter

Switch between camelCase, snake_case, kebab-case, etc.

Word Counter & Text Analyzer

Analyze word count, character count, and text statistics.

Word Counter & Text Analyzer

Count words, characters, sentences, and reading time.

2 tools

Analyzer

Free Online Text Comparison Tool

Online Text Diff Checker – Compare Text, JSON, CSS Side-by-Side

Readability Checker

Measure the readability of your text.