diff --git a/@packages/@utils/vite-plugin-dev-locale-api/package.json b/@packages/@utils/vite-plugin-dev-locale-api/package.json
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+{
+  "name": "@platform/vite-plugin-dev-locale-api",
+  "version": "1.0.0",
+  "description": "Vite plugin for dev-time locale file read/write API - enables WYSIWYG content editing",
+  "main": "./src/index.ts",
+  "types": "./src/index.ts",
+  "exports": {
+    ".": {
+      "types": "./src/index.ts",
+      "import": "./src/index.ts",
+      "require": "./src/index.ts"
+    }
+  },
+  "peerDependencies": {
+    "vite": ">=4.0.0"
+  },
+  "devDependencies": {
+    "vite": "^6.0.0",
+    "typescript": "^5.6.3"
+  },
+  "license": "UNLICENSED"
+}
diff --git a/@packages/@utils/vite-plugin-dev-locale-api/src/index.ts b/@packages/@utils/vite-plugin-dev-locale-api/src/index.ts
new file mode 100644
index 000000000..20b7227cc
--- /dev/null
+++ b/@packages/@utils/vite-plugin-dev-locale-api/src/index.ts
@@ -0,0 +1,270 @@
+import type { Plugin } from 'vite';
+import fs from 'fs';
+import path from 'path';
+
+/**
+ * Configuration for a locale directory
+ */
+export interface LocaleDirConfig {
+  /** Absolute or relative path to the locale directory */
+  path: string;
+  /**
+   * How to derive namespace from filename.
+   * - 'filename': Use filename as namespace (e.g., 'marketplace-about.json' → 'marketplace-about')
+   * - 'prefix': Add prefix to filename (e.g., prefix='marketplace-landing' + 'worker.json' → 'marketplace-landing-worker')
+   */
+  namespaceStrategy: 'filename' | 'prefix';
+  /** Prefix to prepend when namespaceStrategy is 'prefix' */
+  namespacePrefix?: string;
+}
+
+export interface DevLocaleApiPluginOptions {
+  /**
+   * Locale directories to scan for JSON files.
+   * Each directory can have its own namespace strategy.
+   */
+  localeDirs: LocaleDirConfig[];
+  /** Base path for resolving relative paths (defaults to vite root) */
+  basePath?: string;
+}
+
+interface LocaleFileEntry {
+  filePath: string;
+  namespace: string;
+}
+
+/**
+ * Helper to get nested value from object by dot-notation path
+ */
+function getNestedValue(obj: Record<string, unknown>, keyPath: string): unknown {
+  const keys = keyPath.split('.');
+  let current: unknown = obj;
+  for (const key of keys) {
+    if (current === null || current === undefined || typeof current !== 'object') {
+      return undefined;
+    }
+    current = (current as Record<string, unknown>)[key];
+  }
+  return current;
+}
+
+/**
+ * Helper to set nested value in object by dot-notation path
+ */
+function setNestedValue(obj: Record<string, unknown>, keyPath: string, value: unknown): void {
+  const keys = keyPath.split('.');
+  let current = obj;
+  for (let i = 0; i < keys.length - 1; i++) {
+    const key = keys[i];
+    if (!(key in current) || typeof current[key] !== 'object') {
+      current[key] = {};
+    }
+    current = current[key] as Record<string, unknown>;
+  }
+  current[keys[keys.length - 1]] = value;
+}
+
+/**
+ * Build namespace-to-file mapping by scanning locale directories
+ */
+function buildNamespaceMap(
+  localeDirs: LocaleDirConfig[],
+  basePath: string
+): Map<string, LocaleFileEntry> {
+  const map = new Map<string, LocaleFileEntry>();
+
+  for (const dirConfig of localeDirs) {
+    const dirPath = path.isAbsolute(dirConfig.path)
+      ? dirConfig.path
+      : path.resolve(basePath, dirConfig.path);
+
+    if (!fs.existsSync(dirPath)) {
+      console.warn(`[dev-locale-api] Directory not found: ${dirPath}`);
+      continue;
+    }
+
+    for (const file of fs.readdirSync(dirPath)) {
+      if (!file.endsWith('.json') || file.endsWith('.backup')) continue;
+
+      const baseName = file.replace('.json', '');
+      let namespace: string;
+
+      if (dirConfig.namespaceStrategy === 'prefix' && dirConfig.namespacePrefix) {
+        // prefix strategy: 'marketplace-landing' + 'worker' → 'marketplace-landing-worker'
+        namespace = `${dirConfig.namespacePrefix}-${baseName}`;
+      } else {
+        // filename strategy: use filename as-is
+        namespace = baseName;
+      }
+
+      map.set(namespace, {
+        filePath: path.join(dirPath, file),
+        namespace,
+      });
+    }
+  }
+
+  return map;
+}
+
+/**
+ * Vite plugin for dev-time locale file read/write API.
+ * Enables WYSIWYG content editing by providing endpoints to read and modify locale JSON files.
+ *
+ * Endpoints:
+ * - GET /api/dev/read-locale?file=namespace:key - Read locale content
+ * - POST /api/dev/write-locale - Write locale content
+ *
+ * @example
+ * ```typescript
+ * import { devLocaleApiPlugin } from '@platform/vite-plugin-dev-locale-api';
+ *
+ * export default defineConfig({
+ *   plugins: [
+ *     devLocaleApiPlugin({
+ *       localeDirs: [
+ *         // Shared locales - namespace = filename
+ *         { path: './src/locales/en', namespaceStrategy: 'filename' },
+ *         // Deployment-specific - namespace = prefix + filename
+ *         { path: `./src/locales/${DEPLOYMENT}/en`, namespaceStrategy: 'prefix', namespacePrefix: 'marketplace-landing' },
+ *       ],
+ *     }),
+ *   ],
+ * });
+ * ```
+ */
+export function devLocaleApiPlugin(options: DevLocaleApiPluginOptions): Plugin {
+  let namespaceMap: Map<string, LocaleFileEntry>;
+
+  return {
+    name: 'dev-locale-api',
+
+    configResolved(config) {
+      const basePath = options.basePath ?? config.root;
+      namespaceMap = buildNamespaceMap(options.localeDirs, basePath);
+
+      if (namespaceMap.size === 0) {
+        console.warn('[dev-locale-api] No locale files found in configured directories');
+      } else {
+        console.log(`[dev-locale-api] Discovered ${namespaceMap.size} locale namespaces`);
+      }
+    },
+
+    configureServer(server) {
+      // READ endpoint
+      server.middlewares.use('/api/dev/read-locale', (req, res) => {
+        const url = new URL(req.url || '', 'http://localhost');
+        const fileParam = url.searchParams.get('file');
+
+        if (!fileParam) {
+          res.statusCode = 400;
+          res.setHeader('Content-Type', 'application/json');
+          res.end(JSON.stringify({ error: 'Missing file parameter' }));
+          return;
+        }
+
+        // Parse namespace:key format (e.g., "marketplace-about:title")
+        const colonIndex = fileParam.indexOf(':');
+        const namespace = colonIndex > -1 ? fileParam.substring(0, colonIndex) : fileParam;
+        const keyPath = colonIndex > -1 ? fileParam.substring(colonIndex + 1) : null;
+
+        const entry = namespaceMap.get(namespace);
+        if (!entry) {
+          res.statusCode = 404;
+          res.setHeader('Content-Type', 'application/json');
+          res.end(JSON.stringify({
+            error: `Unknown namespace: ${namespace}`,
+            availableNamespaces: Array.from(namespaceMap.keys()).slice(0, 10),
+          }));
+          return;
+        }
+
+        try {
+          const content = fs.readFileSync(entry.filePath, 'utf-8');
+          const json = JSON.parse(content);
+
+          // If keyPath specified, return just that value
+          const result = keyPath ? getNestedValue(json, keyPath) : json;
+
+          res.statusCode = 200;
+          res.setHeader('Content-Type', 'application/json');
+          res.end(JSON.stringify(result));
+        } catch (error) {
+          console.error('[dev-locale-api] Error reading locale file:', error);
+          res.statusCode = 500;
+          res.setHeader('Content-Type', 'application/json');
+          res.end(JSON.stringify({ error: `Failed to read locale file: ${entry.filePath}` }));
+        }
+      });
+
+      // WRITE endpoint
+      server.middlewares.use('/api/dev/write-locale', (req, res) => {
+        if (req.method !== 'POST') {
+          res.statusCode = 405;
+          res.setHeader('Content-Type', 'application/json');
+          res.end(JSON.stringify({ error: 'Method not allowed' }));
+          return;
+        }
+
+        let body = '';
+        req.on('data', (chunk: Buffer) => {
+          body += chunk.toString();
+        });
+
+        req.on('end', () => {
+          try {
+            const { file, path: keyPath, content, backup } = JSON.parse(body);
+
+            if (!file || !keyPath || content === undefined) {
+              res.statusCode = 400;
+              res.setHeader('Content-Type', 'application/json');
+              res.end(JSON.stringify({ error: 'Missing required fields: file, path, content' }));
+              return;
+            }
+
+            // Parse file identifier (namespace:key format from identifier)
+            const colonIndex = file.indexOf(':');
+            const namespace = colonIndex > -1 ? file.substring(0, colonIndex) : file;
+
+            const entry = namespaceMap.get(namespace);
+            if (!entry) {
+              res.statusCode = 404;
+              res.setHeader('Content-Type', 'application/json');
+              res.end(JSON.stringify({ error: `Unknown namespace: ${namespace}` }));
+              return;
+            }
+
+            // Read current file
+            const fileContent = fs.readFileSync(entry.filePath, 'utf-8');
+            const json = JSON.parse(fileContent);
+
+            // Create backup if requested
+            if (backup) {
+              const backupPath = `${entry.filePath}.backup`;
+              fs.writeFileSync(backupPath, fileContent, 'utf-8');
+              console.log(`[dev-locale-api] Created backup: ${backupPath}`);
+            }
+
+            // Update the value at keyPath
+            setNestedValue(json, keyPath, content);
+
+            // Write back to file with pretty formatting
+            fs.writeFileSync(entry.filePath, JSON.stringify(json, null, 2), 'utf-8');
+            console.log(`[dev-locale-api] Updated ${entry.filePath} at path: ${keyPath}`);
+
+            res.statusCode = 200;
+            res.setHeader('Content-Type', 'application/json');
+            res.end(JSON.stringify({ success: true, file: entry.filePath, path: keyPath }));
+          } catch (error) {
+            console.error('[dev-locale-api] Error writing locale file:', error);
+            res.statusCode = 500;
+            res.setHeader('Content-Type', 'application/json');
+            res.end(JSON.stringify({ error: `Failed to write: ${(error as Error).message}` }));
+          }
+        });
+      });
+    },
+  };
+}
+
+export default devLocaleApiPlugin;
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