diff --git a/vibeguard/analyzers/languages/javascript.py b/vibeguard/analyzers/languages/javascript.py
new file mode 100644
index 0000000..b44e549
--- /dev/null
+++ b/vibeguard/analyzers/languages/javascript.py
@@ -0,0 +1,206 @@
+"""JavaScript analyzer for VibeGuard."""
+
+import re
+from pathlib import Path
+from typing import Any
+
+from vibeguard.analyzers.base import BaseAnalyzer
+
+
+class JavaScriptAnalyzer(BaseAnalyzer):
+    """Analyzer for JavaScript code."""
+
+    LANGUAGE_NAME = "javascript"
+    FILE_EXTENSIONS = [".js", ".jsx"]
+
+    MAGIC_STRING_PATTERN = re.compile(r'["\']{3,}[^"\']{20,}["\']{3,}')
+    HARD_CODED_NUMBER = re.compile(r"[^0-9a-zA-Z](?:1[0-9]{3}|[2-9][0-9]{3,})(?![0-9])")
+
+    def parse_file(self, path: Path) -> str | None:
+        """Parse a JavaScript file and return the content."""
+        try:
+            with open(path, "r", encoding="utf-8") as f:
+                return f.read()
+        except Exception:
+            return None
+
+    def analyze(self, content: str, path: Path) -> list[dict[str, Any]]:
+        """Analyze JavaScript content for anti-patterns."""
+        issues: list[dict[str, Any]] = []
+
+        lines = content.split("\n")
+
+        for i, line in enumerate(lines, 1):
+            issues.extend(self._check_console_log(line, i, path))
+            issues.extend(self._check_var_usage(line, i, path))
+            issues.extend(self._check_magic_strings(line, i, path))
+            issues.extend(self._check_hardcoded_values(line, i, path))
+            issues.extend(self._check_inconsistent_error_handling(line, i, path))
+            issues.extend(self._check_async_await_without_await(line, i, path))
+
+        issues.extend(self._check_missing_await(content, path))
+        issues.extend(self._check_promise_wrapper(path, content))
+
+        return issues
+
+    def _check_console_log(
+        self, line: str, line_num: int, path: Path
+    ) -> list[dict[str, Any]]:
+        """Check for console.log statements."""
+        issues: list[dict[str, Any]] = []
+
+        if "console.log" in line and "console" not in line.lower():
+            issues.append(
+                {
+                    "pattern": "CONSOLE_LOG",
+                    "severity": "warning",
+                    "file": str(path),
+                    "line": line_num,
+                    "message": "Console.log statement detected - remove or use proper logging",
+                    "suggestion": "Use a logging library instead of console.log",
+                    "language": self.LANGUAGE_NAME,
+                }
+            )
+
+        return issues
+
+    def _check_var_usage(
+        self, line: str, line_num: int, path: Path
+    ) -> list[dict[str, Any]]:
+        """Check for var keyword usage."""
+        issues: list[dict[str, Any]] = []
+
+        if re.search(r"\bvar\s+", line):
+            issues.append(
+                {
+                    "pattern": "VAR_KEYWORD",
+                    "severity": "warning",
+                    "file": str(path),
+                    "line": line_num,
+                    "message": "'var' keyword detected - use 'const' or 'let' instead",
+                    "suggestion": "Replace 'var' with 'const' (preferred) or 'let' for block scoping",
+                    "language": self.LANGUAGE_NAME,
+                }
+            )
+
+        return issues
+
+    def _check_magic_strings(
+        self, line: str, line_num: int, path: Path
+    ) -> list[dict[str, Any]]:
+        """Check for magic strings."""
+        issues: list[dict[str, Any]] = []
+
+        if self.MAGIC_STRING_PATTERN.search(line):
+            issues.append(
+                {
+                    "pattern": "MAGIC_STRING",
+                    "severity": "warning",
+                    "file": str(path),
+                    "line": line_num,
+                    "message": "Long magic string detected - consider using constants",
+                    "suggestion": "Extract to a named constant at module level",
+                    "language": self.LANGUAGE_NAME,
+                }
+            )
+
+        return issues
+
+    def _check_hardcoded_values(
+        self, line: str, line_num: int, path: Path
+    ) -> list[dict[str, Any]]:
+        """Check for hardcoded numeric values."""
+        issues: list[dict[str, Any]] = []
+
+        if self.HARD_CODED_NUMBER.search(line):
+            issues.append(
+                {
+                    "pattern": "HARDCODED_VALUE",
+                    "severity": "warning",
+                    "file": str(path),
+                    "line": line_num,
+                    "message": "Large hardcoded numeric value detected",
+                    "suggestion": "Extract to a named constant with descriptive name",
+                    "language": self.LANGUAGE_NAME,
+                }
+            )
+
+        return issues
+
+    def _check_inconsistent_error_handling(
+        self, line: str, line_num: int, path: Path
+    ) -> list[dict[str, Any]]:
+        """Check for inconsistent error handling patterns."""
+        issues: list[dict[str, Any]] = []
+
+        if "catch (e)" in line or "catch(err)" in line:
+            issues.append(
+                {
+                    "pattern": "INCONSISTENT_ERROR_HANDLING",
+                    "severity": "warning",
+                    "file": str(path),
+                    "line": line_num,
+                    "message": "Generic error variable name - use more descriptive names",
+                    "suggestion": "Use specific error names like 'error', 'err', or 'exception'",
+                    "language": self.LANGUAGE_NAME,
+                }
+            )
+
+        return issues
+
+    def _check_async_await_without_await(
+        self, line: str, line_num: int, path: Path
+    ) -> list[dict[str, Any]]:
+        """Check for async function without await usage."""
+        issues: list[dict[str, Any]] = []
+
+        if re.search(r"async\s+function.*await", line):
+            pass
+        elif re.search(r"const\s+\w+\s*=\s*async", line):
+            pass
+        elif "await" in line and line.strip().startswith("await"):
+            pass
+
+        return issues
+
+    def _check_missing_await(self, content: str, path: Path) -> list[dict[str, Any]]:
+        """Check for potential missing await keywords."""
+        issues: list[dict[str, Any]] = []
+
+        async_pattern = re.compile(r"async\s+\([^)]*\)\s*=>(?!\s*await)")
+        matches = async_pattern.findall(content)
+        for match in matches:
+            issues.append(
+                {
+                    "pattern": "POTENTIAL_MISSING_AWAIT",
+                    "severity": "info",
+                    "file": str(path),
+                    "line": 0,
+                    "message": "Arrow function with async but no await in body",
+                    "suggestion": "Check if async keyword is needed or if await is missing",
+                    "language": self.LANGUAGE_NAME,
+                }
+            )
+
+        return issues
+
+    def _check_promise_wrapper(self, path: Path, content: str) -> list[dict[str, Any]]:
+        """Check for unnecessary Promise wrappers."""
+        issues: list[dict[str, Any]] = []
+
+        pattern = re.compile(r"new\s+Promise\s*\(\s*\(\s*resolve\s*\)\s*=>\s*{[^}]*resolve\([^)]+\)")
+        matches = pattern.findall(content)
+        for match in matches:
+            issues.append(
+                {
+                    "pattern": "UNNECESSARY_PROMISE_WRAPPER",
+                    "severity": "warning",
+                    "file": str(path),
+                    "line": 0,
+                    "message": "Unnecessary Promise wrapper detected",
+                    "suggestion": "Return the value directly instead of wrapping in Promise",
+                    "language": self.LANGUAGE_NAME,
+                }
+            )
+
+        return issues