PlayWithJSON – JSON Formatter & Viewer

Fast, clean, developer-focused JSON formatter, validator, and automatic in-page GET API response viewer from PlayWithJSON.

PlayWithJSON is a fast, clean, developer-focused browser extension for formatting, validating, and automatically inspecting JSON data and GET API responses directly in your browser. When you open any API endpoint (such as GET /api/v1/...) or JSON URL, PlayWithJSON automatically transforms raw, unformatted responses into an interactive, beautifully highlighted developer viewer with zero clicks required. You can also click the extension icon anytime to access the fast offline JSON Formatter, Minifier, and Validator popup tool. ✨ KEY FEATURES: 🌐 Automatic In-Page GET API Response Viewer • Auto-Detects JSON: Automatically detects and renders JSON responses when browsing API endpoints • Zero Click Needed: Formats on-page instantly without needing to click extension buttons • URL & Stats Bar: Displays endpoint path, HTTP method, JSON file size, and total keys/items count 🌳 Interactive Collapsible Tree View • Expand & Collapse: Independently fold or unfold any object or array node • Collapsed Preview Badges: Instant summary showing item counts (e.g. { 10 keys }, [ 25 items ]) • Depth Controls: Jump straight to Level 1, Level 2, Level 3, or Expand All with a single click • Clickable Web Links: URLs inside JSON strings automatically turn into clickable links • Hover JSONPath Breadcrumb: See and copy exact paths (e.g. data[0].slug) with one click 🔍 Live Search & Jump • Instant Search: Search across all keys and values in real time • Auto-Reveal: Automatically unfolds collapsed parents to highlight matching nodes • Match Counter: Cycle through search results smoothly with Next (Enter) and Prev (Shift+Enter) • Keyboard Shortcut: Press Cmd+F or Ctrl+F anytime to focus the search bar ⚡ Filter by Key • Key Focus: Type any key name (e.g. name, id, slug) to instantly focus relevant fields and dim non-matching data across large arrays • Quick Filter Chips: Clickable chips automatically generated for the most frequent keys in the response 🔤 Alphabetical Key Sorting (A to Z) • One-Click Sort: Alphabetically sort object keys recursively across the entire dataset • Non-Destructive: Toggle back to the server's original response order anytime 🗜️ One-Click Icon Actions • Minify Icon: Compact JSON to a single line with character count and saved size summary • Copy Icon: Copy formatted or minified JSON with visual confirmation • Save Icon: Download response directly as a formatted .json file 👁️ 3 Flexible Viewing Modes • Tree View: Interactive collapsible node explorer • Code View: Beautified syntax-highlighted code with a clean line-number gutter • Raw View: The exact untouched server response with a quick floating button to return to Tree view 🧰 Standalone Offline Popup Tool • Works completely offline when clicking the extension icon • Format JSON with 2-space or 4-space indentation • Real-time syntax validation with detailed error diagnostics • One-click Sample JSON loader and Clear buttons • Seamless Dark and Light theme toggle matching PlayWithJSON.com 🔒 PRIVACY & SECURITY FIRST: • 100% Client-Side: All JSON parsing, formatting, and tree rendering run entirely inside your browser • Zero Data Collection: Your data, API tokens, and responses are never stored, logged, or sent to external servers • No Account Required: Works immediately upon install with no sign-in or registration • Developer Safe: Ideal for inspecting internal staging APIs, localhost servers, and production endpoints safely 💡 WHO IS THIS FOR? • Frontend & Backend Developers working with REST APIs, GraphQL, and microservices • QA & DevOps Engineers inspecting API payloads and configuration files • Anyone looking for a lightweight, distraction-free alternative to bloated JSON viewers Learn more and explore the full suite of developer utilities at PlayWithJSON (playwithjson.com).