Developer Tools Directory
Explore the entire suite of 25 offline-capable developer utilities. Every tool executes directly in your local browser sandbox with zero network transmission of your code or credentials.
JSON & Data
Format, validate, compare and transform structured data (4 tools)
JSON Formatter & Validator
Format, indent, validate and inspect JSON with syntax error location and tree view.
JSON Diff Checker
Compare two JSON payloads side-by-side with structural diffing and key sorting.
JSON to CSV & CSV to JSON Converter
Convert JSON arrays to CSV spreadsheets and CSV back to JSON with live table preview.
JSONPath & Schema Validator
Test JSONPath query expressions and validate JSON against JSON Schema definitions.
Encoding & Crypto
Decode tokens, convert encodings and compute local hashes (5 tools)
Base64 Encoder & Decoder
Encode and decode text, hex, URL-safe Base64, and convert images/files to Data URIs.
JWT Decoder & Inspector
Decode and inspect JSON Web Tokens (Header, Payload, Claims, Expiration) with client-side verification.
URL Encoder & Decoder
Encode and decode URLs, query parameters, and reserved characters with RFC 3986 compliance.
Cryptographic Hash & Checksum Generator
Generate SHA-256, SHA-512, SHA-1, MD5, and HMAC hashes locally using Web Crypto API.
HTML Entity Encoder & Decoder
Encode special characters into HTML entities and decode HTML entities to plain text.
Code & Debugging
Analyze expressions, compare diffs and test timestamps (7 tools)
Regex Tester & Explainer
Test regular expressions with real-time match highlighting, capture groups, and token explanation.
Text & Code Diff Checker
Compare text and code line-by-line or character-by-character with visual side-by-side diffing.
SQL Formatter & Beautifier
Beautify, indent, format, and minify SQL queries across PostgreSQL, MySQL, and SQLite dialects.
Cron Expression Parser & Humanizer
Translate cron expressions into human-readable English and calculate upcoming execution schedules.
Unix Timestamp & Epoch Converter
Convert Unix epoch timestamps to human-readable dates, UTC, ISO 8601, and local time with live ticker.
UUID & Random ID Generator
Generate cryptographically secure UUID v4, UUID v7 style, NanoIDs, and bulk unique identifiers.
Live Markdown Editor & Preview
Edit markdown with real-time split-screen preview, HTML export, word counters, and cheatsheet.
Web & CSS Styling
Generate modern CSS, gradients, colors and convert JSX (5 tools)
CSS Gradient Generator
Design linear, radial, and conic CSS gradients with multi-color stops and Tailwind code export.
Color Converter & WCAG Contrast Checker
Convert HEX, RGB, HSL, and HSV colors and evaluate WCAG 2.1 AA/AAA accessibility contrast ratios.
CSS Box Shadow & Glassmorphism Generator
Design layered shadows, smooth glows, and glassmorphic card effects with live preview and code export.
HTML to JSX & React Converter
Convert raw HTML markup and inline styles into clean React JSX components with camelCase attributes.
SVG Viewer, Optimizer & Data URI Converter
Clean up SVGs, remove metadata, convert to React components, and generate CSS Data URIs.
API & Network
Parse URLs, inspect headers, convert cURL and check status (4 tools)
URL & Query Parameter Parser / Builder
Deconstruct URLs into protocol, host, path, and interactively build, edit, and toggle query parameters.
cURL to Fetch, Axios & Python Converter
Convert cURL terminal commands into JavaScript fetch, Axios, and Python requests code.
HTTP Status Code Lookup & Guide
Searchable directory of HTTP status codes with RFC specifications, causes, and debugging tips.
User-Agent Parser & Device Inspector
Inspect your current client device specifications or parse any custom User-Agent string.