Initial commit: Developer Tools MVP with visual editor

- Complete React app with 7 developer tools
- JSON Tool with visual structured editor
- Serialize Tool with visual structured editor
- URL, Base64, CSV/JSON, Beautifier, Diff tools
- Responsive navigation with dropdown menu
- Dark/light mode toggle
- Mobile-responsive design with sticky header
- All tools working with copy/paste functionality

node_modules/esrecurse/package.json

@@ -0,0 +1,52 @@
+{
+  "name": "esrecurse",
+  "description": "ECMAScript AST recursive visitor",
+  "homepage": "https://github.com/estools/esrecurse",
+  "main": "esrecurse.js",
+  "version": "4.3.0",
+  "engines": {
+    "node": ">=4.0"
+  },
+  "maintainers": [
+    {
+      "name": "Yusuke Suzuki",
+      "email": "utatane.tea@gmail.com",
+      "web": "https://github.com/Constellation"
+    }
+  ],
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/estools/esrecurse.git"
+  },
+  "dependencies": {
+    "estraverse": "^5.2.0"
+  },
+  "devDependencies": {
+    "babel-cli": "^6.24.1",
+    "babel-eslint": "^7.2.3",
+    "babel-preset-es2015": "^6.24.1",
+    "babel-register": "^6.24.1",
+    "chai": "^4.0.2",
+    "esprima": "^4.0.0",
+    "gulp": "^3.9.0",
+    "gulp-bump": "^2.7.0",
+    "gulp-eslint": "^4.0.0",
+    "gulp-filter": "^5.0.0",
+    "gulp-git": "^2.4.1",
+    "gulp-mocha": "^4.3.1",
+    "gulp-tag-version": "^1.2.1",
+    "jsdoc": "^3.3.0-alpha10",
+    "minimist": "^1.1.0"
+  },
+  "license": "BSD-2-Clause",
+  "scripts": {
+    "test": "gulp travis",
+    "unit-test": "gulp test",
+    "lint": "gulp lint"
+  },
+  "babel": {
+    "presets": [
+      "es2015"
+    ]
+  }
+}