Dev Utilities Tools
Essential developer utilities for everyday text manipulation, data conversion, and workflow automation. The collection includes a Case Converter for transforming text between camelCase, snake_case, PascalCase, kebab-case, and more. The Timestamp Converter translates between Unix timestamps and human-readable dates with timezone support. The Cron Expression Generator builds and validates cron schedules with plain-English descriptions. The Diff Checker compares two text inputs and highlights additions, deletions, and changes. The API Tester sends HTTP requests and displays responses for quick endpoint debugging. All utilities run client-side in your browser — your text, timestamps, and API data never leave your machine.
13 tools available
What You'll Find
This collection includes AI Token Counter for estimate token counts and api costs for gpt-4, claude, and other ai models, Regex Tester for test regular expressions in real-time with match highlighting and capture group details, Diff Checker for compare two texts side by side and highlight added, removed, and unchanged lines, HTML to Image for render html and css code as a downloadable png image in your browser, Timestamp Converter for convert unix timestamps to human-readable dates and vice versa with timezone support, Cron Expression Generator for build cron expressions visually with human-readable explanations and common presets, API Tester for test http requests directly from your browser with custom headers, body, and response formatting, cURL Converter for convert curl commands to javascript, python, php, or go code and build curl commands visually, IP Address Info for look up your ip address and geolocation details including city, country, isp, and timezone, Case Converter for convert text between camelcase, snake_case, kebab-case, pascalcase, and more styles, Text Utilities for count words, remove duplicates, sort, reverse, shuffle lines, and more text operations, Common Ports Reference for searchable reference of common tcp/udp ports with service names, protocols, and descriptions, HTMX Snippet Library for browse and copy ready-to-use htmx patterns for forms, search, modals, pagination, and more. Each tool is designed to save you time and deliver professional results right from your browser.
When to Use Each Tool
Common Workflows
These dev utilities tools work well together. Start with AI Token Counter to estimate token counts and api costs for gpt-4, claude, and other ai models, then use Regex Tester to test regular expressions in real-time with match highlighting and capture group details. Combine with Diff Checker to round out your workflow and cover all your dev utilities needs.
AI Token Counter
Estimate token counts and API costs for GPT-4, Claude, and other AI models.
Regex Tester
Test regular expressions in real-time with match highlighting and capture group details.
Diff Checker
Compare two texts side by side and highlight added, removed, and unchanged lines.
HTML to Image
Render HTML and CSS code as a downloadable PNG image in your browser.
Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa with timezone support.
Cron Expression Generator
Build cron expressions visually with human-readable explanations and common presets.
API Tester
Test HTTP requests directly from your browser with custom headers, body, and response formatting.
cURL Converter
Convert curl commands to JavaScript, Python, PHP, or Go code and build curl commands visually.
IP Address Info
Look up your IP address and geolocation details including city, country, ISP, and timezone.
Case Converter
Convert text between camelCase, snake_case, kebab-case, PascalCase, and more styles.
Text Utilities
Count words, remove duplicates, sort, reverse, shuffle lines, and more text operations.
Common Ports Reference
Searchable reference of common TCP/UDP ports with service names, protocols, and descriptions.
HTMX Snippet Library
Browse and copy ready-to-use HTMX patterns for forms, search, modals, pagination, and more.
Frequently Asked Questions
Can the API tester handle authenticated requests?
The API tester supports custom headers, so you can include Authorization tokens, API keys, and other authentication headers. Note that CORS restrictions may limit which external APIs you can test from a browser-based tool.
Does the cron generator support all cron formats?
The cron expression generator supports standard 5-field cron syntax (minute, hour, day, month, weekday) used by most Unix systems, AWS, and CI/CD platforms. It provides plain-English descriptions and next-run previews.
What case formats does the case converter support?
The case converter supports camelCase, PascalCase, snake_case, SCREAMING_SNAKE_CASE, kebab-case, Title Case, UPPER CASE, lower case, and dot.case — covering all common programming and text conventions.
Related Resources
Explore more tools in the Developer section, or browse all categories below.