⚡ Generate Tools

Generate UUIDs, convert curl commands to code, transform JSON to TypeScript interfaces, create CSS gradients, calculate chmod permissions, test regex patterns, and more. Choose a tool below to get started.

UUID v4 Generator Generate random UUID v4 identifiers instantly. Create single or bulk UUIDs with options for uppercase, hyphens, and braces. Regex Tester Test regular expressions against sample text in real time. See matches highlighted, capture groups, and match details instantly. Color Code Converter Convert color codes between HEX, RGB, and HSL formats instantly. Preview colors and copy converted values for CSS. Unix Timestamp Converter Convert Unix timestamps to human-readable dates and vice versa. Supports seconds and milliseconds with timezone display. Cron Expression Helper Build and understand cron expressions easily. See human-readable descriptions and next run times for your cron schedule. cURL to Code Converter Convert curl commands to Python, JavaScript, Node.js, PHP, or Go code instantly. Parses headers, body, auth, and method. JSON to TypeScript Converter Convert JSON objects to TypeScript interface definitions. Recursively infers types for nested objects and arrays. CSS Gradient Generator Create CSS linear and radial gradients visually with color pickers, angle control, and live preview. Copy the generated CSS. Chmod Calculator Calculate Unix file permissions with an interactive checkbox grid. Convert between numeric (755) and symbolic (rwxr-xr-x) formats.

About Generate Tools

Developers constantly need to generate identifiers, test patterns, convert values, and schedule tasks. These tools cover the most common generation and conversion tasks in everyday development work: creating random UUIDs for database records, testing regex patterns against real input, converting color codes between formats, working with Unix timestamps, and building cron expressions for scheduled jobs.

UUID Generator

A UUID (Universally Unique Identifier) version 4 is a 128-bit random identifier formatted as 32 hexadecimal digits separated by hyphens: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx. UUIDs are the standard choice for primary keys in distributed systems because they can be generated independently on any machine without coordination, making them safe to use in microservices, offline-first apps, and any situation where auto-incrementing integers would create conflicts. The probability of a collision between two randomly generated UUIDs is astronomically small (about 1 in 5.3×10³⁶).

Regex Tester

Regular expressions are powerful but notoriously hard to write correctly. The Regex Tester lets you enter a pattern and test it against sample text in real time, with matches highlighted and capture groups displayed. This is far faster than the write-run-check cycle of testing regex in your editor or terminal. Common use cases include validating email addresses, extracting data from log files, parsing structured text, and writing input validation rules.

Color Code Converter

CSS uses three main color formats: HEX (#ff6b35), RGB (rgb(255, 107, 53)), and HSL (hsl(18, 100%, 60%)). Each has advantages: HEX is compact and familiar, RGB maps directly to screen hardware, and HSL makes it intuitive to adjust lightness and saturation. The Color Converter translates between all three instantly so you can move between design tools (which often output HEX) and CSS code (where HSL is often more maintainable).

Unix Timestamp Converter

Unix timestamps count seconds (or milliseconds) since January 1, 1970, 00:00:00 UTC. They appear in API responses, database records, log files, and JWT expiration claims. The Timestamp Converter translates between Unix timestamps and human-readable dates in both directions, supporting both second-precision and millisecond-precision timestamps with timezone display.

Cron Expression Helper

Cron expressions schedule recurring tasks on Unix systems and cloud platforms (AWS EventBridge, GitHub Actions, Kubernetes CronJobs). The five-field format (minute, hour, day-of-month, month, day-of-week) is compact but easy to get wrong. The Cron Expression Helper shows a plain-English description of what your expression means and lists the next several run times, so you can confirm the schedule before deploying.

cURL to Code Converter

API documentation universally provides examples as curl commands. This converter parses a curl command — extracting the URL, HTTP method, headers, request body, and authentication — and generates equivalent code in Python (requests), JavaScript (fetch), Node.js (axios), PHP (curl), or Go (net/http). It handles quoted strings, escaped characters, and multi-line commands with backslash continuations. Paste a curl command from browser DevTools, API docs, or a colleague's message and get production-ready code in seconds.

JSON to TypeScript Converter

Converting JSON API responses into TypeScript interfaces is a repetitive task that this tool automates. Paste a JSON object and get correctly typed interfaces with nested object extraction, array type inference, and proper property naming. The generated interfaces give you compile-time type safety for API integrations, database queries, and config files. Rename the output interfaces to match your domain (e.g., Root becomes UserProfile) and add optional markers where needed.

CSS Gradient Generator

Create beautiful CSS gradients without memorizing the syntax. The visual generator lets you pick colors, set positions, choose between linear and radial types, and adjust the angle — all with a live preview. The generated CSS uses standard linear-gradient() or radial-gradient() syntax that works in all modern browsers without vendor prefixes. Use it for hero backgrounds, buttons, cards, and anywhere you want a smooth color transition.

Chmod Calculator

Unix file permissions can be confusing to calculate by hand. The chmod calculator provides a visual checkbox grid — Owner, Group, and Others crossed with Read, Write, and Execute — and instantly shows the numeric (755), symbolic (rwxr-xr-x), and command (chmod 755 filename) representations. It is bidirectional: enter a number and the checkboxes update, or click checkboxes and the number updates. Essential for setting up web servers, SSH keys, deploy scripts, and Docker containers.

Frequently Asked Questions

What is the difference between UUID v1 and UUID v4?

UUID v1 is generated from the current timestamp and the machine's MAC address, making it time-sortable but potentially leaking system information. UUID v4 is randomly generated with no relationship to the machine or time, which is preferable for security-sensitive applications. UUID v4 is the most widely used version for database primary keys.

How do I convert a Unix timestamp to a date in JavaScript?

Use new Date(timestamp * 1000).toISOString() for second-precision timestamps, or new Date(timestamp).toISOString() for millisecond timestamps. Multiply by 1000 because JavaScript's Date constructor expects milliseconds.

What does the cron expression "0 9 * * 1-5" mean?

It means "at 9:00 AM, Monday through Friday." The fields are: 0 (minute 0), 9 (hour 9), * (every day of month), * (every month), 1-5 (Monday to Friday). Use the Cron Expression Helper to verify any expression before scheduling it in production.