36 daily-use utilities for developers
This hub is built around the utilities that come up constantly in development work — Base64 encoding, JSON formatting, UUID generation, JWT decoding, URL encoding, regex testing, cron expression building, lorem ipsum generation, QR code creation, and much more. Each tool is purpose-built to do one thing quickly.
No installs, no extensions, no sign-ups: Everything runs in-browser. Whether you're debugging an API response, generating test data, building a regex pattern, or decoding a JWT — these tools handle the job without switching to a desktop app or IDE plugin.
36 Developer Tools
Each tool is purpose-built for a specific task. No bloat, no gated features.
JSON Formatter & Validator
Format, prettify, minify, and validate JSON data — with syntax highlighting, error detection, and collapsible tree view. The most-used developer tool for inspecting API responses and config files.
Base64 Encode / Decode
Encode text or binary data to Base64 and decode Base64 strings back to plaintext. Supports both standard and URL-safe Base64 variants — essential for API authentication headers and data URI encoding.
URL Encode / Decode
Percent-encode strings for use in URLs and decode percent-encoded strings back to readable text. Handles all reserved characters according to RFC 3986.
JWT Decoder
Decode and inspect JSON Web Token (JWT) header, payload, and signature components without a secret key. Useful for debugging authentication tokens during development — all decoding is client-side.
Regex Tester
Test regular expressions against any input string with real-time match highlighting, capture group display, and flag support (global, case-insensitive, multiline). Includes a cheat sheet for common patterns.
Cron Generator
Build and explain cron expressions visually — select minute, hour, day, month, and weekday values and get the cron expression with a plain-language description and next 5 execution times.
UUID Generator
Generate cryptographically random UUID v4 values — single or in bulk. Copy individually or export as a list. Used for primary keys, session tokens, and unique identifiers in applications.
QR Code Generator
Generate QR codes for URLs, text, contact cards, and Wi-Fi credentials — with configurable size, error correction level, and background/foreground colours. Download as PNG.
CSV to JSON Converter
Convert CSV data to JSON and vice versa — with header row detection, delimiter configuration, and nested object support. Useful for data pipeline testing and format migration.
JSON to XML Converter
Convert JSON to XML and XML to JSON — useful when working with APIs or services that require XML input/output from JSON-native codebases.
Markdown to HTML
Convert Markdown to HTML with live preview — supporting headers, lists, code blocks, tables, blockquotes, and inline formatting. Useful for CMS integrations and static site generators.
HTML Entity Encoder / Decoder
Encode special characters to HTML entities (&, <, >, etc.) and decode HTML entities back to characters. Essential for preventing XSS and correctly rendering special characters in HTML.
HTML Minifier
Minify HTML by removing whitespace, comments, and optional closing tags to reduce page size for production deployment.
HTML Editor
A browser-based HTML/CSS/JS editor with live preview — write or paste HTML and see the rendered result in real time. Useful for quick prototypes, debugging snippets, and sharing HTML examples.
JS Minifier / Beautifier
Minify JavaScript for production deployment or beautify/format compressed JS for readability and debugging. Handles both directions with a single tool.
Lorem Ipsum Generator
Generate lorem ipsum placeholder text by words, sentences, or paragraphs — with optional HTML wrapping in <p> tags. Useful for mockups, templates, and UI development.
Slug Generator
Convert any text to a URL-friendly slug — lowercasing, replacing spaces with hyphens, and stripping special characters. Useful for generating post slugs, product URLs, and route names.
Bulk Slug Generator
Convert a list of titles or text strings to URL slugs in bulk — paste multiple lines and get slug output for each. Useful for content migrations and bulk URL generation.
UTM Parameter Generator
Build UTM-tagged URLs for campaign tracking in Google Analytics — with fields for source, medium, campaign, term, and content. Produces a validated tagged URL ready to use.
Open Multiple URLs
Paste a list of URLs and open them all in new browser tabs at once. Useful for batch review sessions, competitive research, and QA testing of multiple pages.
Random Number Generator
Generate random integers or decimals within a configurable range, with optional exclusion lists and bulk generation. Useful for sampling, simulation, and test data generation.
Random String Generator
Generate random strings of configurable length from custom character sets — letters, numbers, symbols, or a custom alphabet. Useful for generating test data, tokens, and placeholder identifiers.
Random Name Generator
Generate realistic random names (first, last, or full) for use in test datasets, mockups, and dummy data scenarios — with optional locale selection.
Dummy Credit Card Generator
Generate valid-format (Luhn-compliant) dummy credit card numbers for Visa, Mastercard, Amex, and Discover — for use in payment gateway testing and form validation only.
NS Lookup
Perform NS (nameserver) lookups for any domain — returns the authoritative nameservers, A records, MX records, and TXT records. Useful for DNS debugging and domain configuration verification.
WHOIS Domain Lookup
Look up WHOIS registration data for any domain — including registrar, registration date, expiry date, nameservers, and registrant details (where available). Useful for domain research and expiry monitoring.
Website Screenshot Generator
Capture a screenshot of any live URL — useful for visual documentation, bug reporting, competitive research, and archiving page states without browser extensions.
Screen Resolution Simulator
Preview how a website renders at different screen resolutions — covering common desktop, tablet, and mobile breakpoints — without needing Chrome DevTools.
Camera Test
Test your webcam and camera permissions in the browser — useful for verifying camera access before video calls and confirming that browser permissions are correctly configured.
Pomodoro Timer
A full-featured Pomodoro timer with configurable work and break intervals, session counting, and desktop notifications. Helps maintain focus and track deep work sessions.
Countdown / Stopwatch
A combined countdown timer and stopwatch — set a target time or measure elapsed time with lap recording. Useful for timed tests, sprint planning, and presentation timing.
World Clock
Display the current time across multiple time zones simultaneously — add and remove cities to build a custom world clock view for distributed team co-ordination.
Habit Tracker
Track daily habits with a simple calendar-style check-in interface — mark habits as complete each day and see your current streak and consistency rate over time.
To-Do List
A lightweight browser-based to-do list with task creation, completion tracking, and priority tagging — no account required, data persists in browser storage.
Coin Flip / Dice Roller
Flip a coin or roll dice (D4, D6, D8, D10, D12, D20) — with multiple dice support and roll history. Useful for games, random selection, and statistics demonstrations.
Online Screen Recorder
Record your screen directly in the browser — captures screen, window, or tab with optional audio. Useful for creating bug reports, walkthrough videos, and documentation.
Common scenarios these tools solve
Purpose-built for professionals and everyday users who need fast, reliable results.
Back-End Developers
Decode JWTs, format JSON responses, generate UUIDs, build cron expressions, and test regex patterns without leaving the browser.
Front-End Developers
Encode/decode Base64 and URLs, generate QR codes, build HTML entities, and minify JS — fast utilities for everyday front-end tasks.
Data Engineers
Convert between CSV and JSON, format and validate JSON structures, and generate lorem ipsum for data pipeline testing.
DevOps Engineers
Build and validate cron expressions, look up NS records, perform WHOIS lookups, and test screen resolutions for responsive debugging.
Product Managers
Use the UTM Parameter Generator, Pomodoro Timer, To-Do List, Habit Tracker, and Countdown Timer as lightweight daily productivity tools.
Full-Stack Developers
Generate QR codes for mobile testing, use the Screen Resolution Simulator for responsive QA, and capture screenshots for documentation.
Full Tool Index
A quick-reference table of key tools in this hub — what they do and when to use them.
| Tool | Category | Primary Use |
|---|---|---|
| JSON Formatter | JSON | Format, validate, and inspect JSON data |
| Base64 Encode/Decode | Encoding | Encode and decode Base64 strings |
| JWT Decoder | Security | Decode JWT header and payload client-side |
| Regex Tester | Testing | Test regex with live match highlighting |
| QR Code Generator | Generator | Generate QR codes for URLs, text, vCard |
| UUID Generator | Generator | Cryptographically random UUID v4 generation |
| Cron Generator | Utility | Build cron expressions visually with explanation |
| UTM Parameter Gen | Marketing | Build GA-ready UTM-tagged URLs |
Which tools to use — and when
Match your task to the right tool or sequence of tools.
JSON Formatter → JWT Decoder
Format the response, then decode the JWT token if authentication is involved.
Go to tool Test DataUUID → Random Name → Dummy Card
Generate IDs, names, and card numbers for a complete test dataset.
Go to tool Campaign SetupUTM Generator → Slug Generator
Build UTM URLs, then generate clean slugs for landing page routes.
Go to tool Encoding ChainBase64 → URL Encode
Base64-encode a payload, then URL-encode it for safe transport in query strings.
Go to tool Scheduled JobsCron Generator
Build and validate cron expressions before deploying scheduled tasks.
Go to tool ProductivityPomodoro → Habit Tracker
Time deep work sessions, then log them in the Habit Tracker for consistency.
Go to tool