Developer Toolbox

A privacy-first developer utility toolbox for inspecting pages, extracting assets, formatting data, and more — entirely local.

Developer Toolbox is a modern Chrome extension that brings essential web development utilities into one fast, polished side panel. Inspect pages, extract data, format code, and debug network activity without sending anything to external servers. Built for developers, designers, QA engineers, and technical marketers who need quick answers from the page they are on. WHY INSTALL DEVELOPER TOOLBOX? • All-in-one: 14+ tools in a single extension instead of installing many small ones • Privacy-first: no accounts, analytics, tracking, or cloud uploads • Fast and local: processing happens entirely in your browser • Modern UI: dark theme, search, keyboard shortcuts, copy buttons, and clear empty/error states • Side panel: stays open while you work on the page PAGE TOOLS Page Information View URL, origin, protocol, host, path, query string, hash, title, referrer, user agent, viewport and screen size, and timestamp. Copy any field or copy all at once. Link Extractor Extract all links from the current page with text, URL, same-origin/external status, protocol, and occurrence count. Search, sort, dedupe, copy URLs, and export as TXT or JSON. Image Extractor Find images with thumbnails, URLs, alt text, dimensions, and file type. Search, copy URLs, open images, download, and remove duplicates. Metadata Inspector Inspect title, description, keywords, canonical URL, robots, Open Graph, Twitter Card tags, language, charset, viewport, and theme color. Copy values or export JSON. Color Extractor Analyze common colors used on the page with HEX, RGB, and HSL values. Includes a manual color converter. Storage Inspector Inspect localStorage, sessionStorage, IndexedDB overview, and extension storage. Search keys and values and copy entries safely. Text Extractor Extract readable page text with search, word count, character count, copy, and TXT download. Headers and Security View HTTPS status and available security-related information such as CSP, referrer policy, and permissions policy when Chrome exposes them. Unavailable data is clearly labeled. DEVELOPER TOOLS JSON Formatter Format, minify, validate, sort keys, copy, clear, and download JSON. Invalid JSON shows useful error location hints. Encoder / Decoder Base64, URL, and HTML encode/decode in separate tabs with graceful error handling. CSS Selector Generator Pick an element on the page and generate CSS selector, XPath, tag, ID, classes, and parent path. Copy CSS or XPath instantly. Request Inspector Review network activity observable through supported Chrome APIs: method, URL, status, type, initiator, timestamps, and headers. Sensitive headers like cookies and authorization tokens are redacted. Fetch / cURL Generator Generate safe fetch() and curl examples from observed requests. Secrets are never included. Regex Tester Test regex patterns with flags, match highlighting, capture groups, replace preview, and common examples. PRODUCTIVITY FEATURES • Sidebar navigation with searchable tools • Context menu for quick actions: Extract Links, Page Metadata, Generate CSS Selector, Copy Page URL, and more • Selection actions: Encode, Decode, JSON Format, and Regex Test • Keyboard shortcuts: Ctrl+Shift+D Open Developer Toolbox Ctrl+Shift+L Extract Links Ctrl+Shift+M Metadata Inspector • Toast notifications and one-click copy buttons throughout PRIVACY AND SECURITY Developer Toolbox is designed as a legitimate developer utility. • No external backend • No analytics or telemetry • No user accounts • No webpage content uploads • No credential, password, cookie, or token harvesting • Sensitive request headers are redacted by default All tools operate on information that Chrome legitimately exposes to the extension under declared permissions. PERMISSIONS EXPLAINED • Side panel: main toolbox interface • Storage: lightweight session state and extension storage inspection • Context menus and commands: right-click and keyboard shortcuts • Active tab / tabs: read the current page when you open a tool • Web request: observe request metadata for the Requests and cURL tools • Host access: required for page inspection on normal websites PERFECT FOR • Frontend developers debugging DOM, metadata, and selectors • Backend and API developers generating fetch/cURL snippets • SEO specialists reviewing metadata and links • QA teams extracting page content and assets • Anyone who wants fast dev utilities without privacy tradeoffs Install Developer Toolbox and keep your browser development workflow in one clean, fast, local workspace.