JSON-RPC Viewer

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📋 What is this tool for?

\n This tool parses and visualizes JSON Lines containing JSON-RPC messages. \n It's particularly useful for analyzing Language Server Protocol (LSP) logs, API debugging, \n and understanding request-response flows.\n

📝 Show example input format

Content-Length: 87\n\n{\"jsonrpc\":\"2.0\",\"id\":1,\"method\":\"initialize\",\"params\":{\"capabilities\":{}}}\nContent-Length: 45\n\n{\"jsonrpc\":\"2.0\",\"id\":1,\"result\":{\"capabilities\":{}}}\nContent-Length: 52\n\n{\"jsonrpc\":\"2.0\",\"method\":\"initialized\",\"params\":{}}

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Paste JSON-RPC Messages

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\n\n \n\n`;\n\n return new Response(html, {\n headers: {\n 'Content-Type': 'text/html',\n },\n });\n}","label",[80],"d73e2d04-471b-11f0-9afb-76b3cceeab13",["D",1749684534928],"# JSON-RPC Viewer\n\nA web-based tool for parsing and visualizing JSON Lines containing JSON-RPC messages. Perfect for analyzing Language Server Protocol (LSP) logs, debugging API communications, and understanding request-response flows.\n\n## 🚀 How to Use\n\n### 1. **Input Your Data**\nPaste your JSON-RPC communication logs into the textarea. The tool accepts:\n- Raw JSON Lines (one JSON object per line)\n- Messages with Content-Length headers (LSP format)\n- Mixed formats with varying whitespace\n\n### 2. **Parse & Visualize**\nClick **\"Parse Messages\"** to extract and display the JSON-RPC messages with:\n- **Request-Response Grouping**: Related messages are paired together\n- **Direction Indicators**: Client → Server vs Server → Client\n- **Message Types**: REQUEST, RESPONSE, NOTIFICATION\n- **Method Names & IDs**: Clearly labeled for easy identification\n\n### 3. **Control Your View**\nUse the toolbar buttons to customize the display:\n- **Toggle Grouping**: Switch between grouped pairs and chronological order\n- **Hide Ping**: Filter out noisy ping/keepalive messages\n- **Collapse/Expand All**: Minimize or maximize all message content\n- **Individual Controls**: Collapse/expand specific messages or pairs\n\n## 📋 Example Input Format\n\n```\nContent-Length: 87\n\n{\"jsonrpc\":\"2.0\",\"id\":1,\"method\":\"initialize\",\"params\":{\"capabilities\":{}}}\nContent-Length: 45\n\n{\"jsonrpc\":\"2.0\",\"id\":1,\"result\":{\"capabilities\":{}}}\nContent-Length: 52\n\n{\"jsonrpc\":\"2.0\",\"method\":\"initialized\",\"params\":{}}\n```\n\n## ✨ Key Features\n\n- **Smart Grouping**: Automatically pairs requests with their responses\n- **Ping Filtering**: Hide noisy keepalive messages with one click\n- **Visual Distinction**: Color-coded messages with clear direction indicators\n- **Flexible Views**: Toggle between grouped and chronological display\n- **Responsive Design**: Works on desktop and mobile devices\n- **Privacy-First**: All parsing happens client-side, no data sent to servers\n\n## 🎯 Perfect For\n\n- **LSP Analysis**: Debug Language Server Protocol communications\n- **API Development**: Visualize JSON-RPC API request/response flows\n- **Protocol Debugging**: Understand complex message sequences\n- **Documentation**: Create visual representations of API interactions\n- **Learning**: Study how JSON-RPC protocols work in practice\n\n## 🔧 Technical Notes\n\n- Built with vanilla JavaScript and TailwindCSS\n- Handles malformed JSON gracefully with error reporting\n- Supports large message logs with efficient parsing\n- No external dependencies or data transmission",[70],"pulls","branches","forks","envVars",{"_76":20,"_180":20},"connections",{"_76":20,"_179":20},"unfilledCount","emptyCount",{"_27":168,"_13":70,"_68":69,"_37":-5,"_29":30,"_161":34,"_162":93,"_31":187,"_33":20,"_71":48,"_164":170,"_72":24,"_166":-5,"_184":188,"_130":189},{"_27":160,"_13":80,"_68":79,"_37":-5,"_29":30,"_161":34,"_162":93,"_31":183,"_33":20,"_71":81,"_164":165,"_72":24,"_166":-5,"_184":185,"_130":186},["D",1749684534928],"children",[],[80],["D",1749684534928],[],[70],["D",1749682895450],{"_11":12,"_129":75},{"_11":12,"_125":-5,"_74":75,"_25":73,"_126":127,"_128":24},{"_33":34,"_13":16,"_27":30,"_116":82,"_117":64,"_118":119,"_120":86,"_121":82,"_122":36,"_123":14,"_124":12},"ctx",{"_46":-5,"_150":227,"_228":229,"_230":231,"_232":24,"_233":24,"_234":24,"_235":93,"_236":-5,"_237":-7,"_238":-7,"_239":20,"_240":24,"_241":24,"_242":-5,"_243":24,"_244":24,"_245":24,"_246":-5},"ENV",{"_198":199,"_200":201,"_202":65,"_203":204,"_205":206,"_207":208,"_209":210,"_211":212,"_213":214,"_215":216,"_217":218,"_219":220,"_221":222,"_223":224,"_225":226},"REACT_APP_SENTRY_DSN","https://586020d86f05489db63a554690acf1e9@o1398359.ingest.sentry.io/6724499","RENDER_GIT_COMMIT","e87eb04e707cf64e7e532c8e8ec395f209e17f15","RENDER_GIT_BRANCH","POSTHOG_API_TOKEN","phc_nmoyuAkStEZuUp69rYlg1DZgrIt19Gx0Y4Hwf8tGgJP","POSTHOG_API_HOST","https://wart.val.town","WEB_API_TEMPLATE","https://{val}.web.val.run","APP_URL","https://www.val.town","MODULE_URL","https://esm.town","VANITY_WEB_API_TEMPLATE","https://{label}.val.run/","DENOLS_URL","https://lsp.val.town","NODE_ENV","production","CLOUDFLARE_TURNSTILE_SITE_KEY","0x4AAAAAACtaIZJH7s9rBMZ6","GOOGLE_CLIENT_ID","875989696899-jtsqkhlbdv5jrlsk8631p7ipjg3c6o62.apps.googleusercontent.com","STRIPE_PUBLISHABLE_KEY","pk_live_51N2zvWEpZTTLipIkVEwXrUG9AT0yeOOEYxszarZT1jpsZV58Ly6wlg3SltZpHN26CUalOBmUSY7adQRQiSkCZz2500qSXNkf8Y","API_URL","https://api.val.town",[],"preferencesKeybindings","default","preferencesTheme","light","preferencesFixers","preferencesCopilot","preferencesSelectionAi","preferencesCloseBrackets","preferencesChatPanelState","preferencesDprint","preferencesDenofmt","notificationCount","flagDenols","isBusinessOrgMember","businessOrgHandle","isBusinessOrgAdmin","isHigherTownieTier","navCollapsed","currentOrgId"]

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