diff --git a/pyproject.toml b/pyproject.toml
index c918a23..f2ba6d7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "twitter-cli"
-version = "0.4.5"
+version = "0.4.6"
 description = "A CLI for Twitter/X — feed, bookmarks, and user timeline in terminal"
 readme = "README.md"
 license = "Apache-2.0"
diff --git a/twitter_cli/auth.py b/twitter_cli/auth.py
index 3a4cf51..170807b 100644
--- a/twitter_cli/auth.py
+++ b/twitter_cli/auth.py
@@ -252,7 +252,7 @@ def extract_from_browser() -> Optional[Dict[str, str]]:
 
 
 def get_cookies() -> Dict[str, str]:
-    """Get Twitter cookies. Priority: env vars -> browser extraction (Chrome/Edge/Firefox/Brave).
+    """Get Twitter cookies. Priority: env vars -> cache file -> browser extraction.
 
     Raises RuntimeError if no cookies found.
     """
@@ -263,9 +263,17 @@ def get_cookies() -> Dict[str, str]:
     if cookies:
         logger.info("Loaded cookies from environment variables")
 
-    # 2. Try browser extraction (auto-detect)
+    # 2. Try cached cookies (file cache with TTL)
+    if not cookies:
+        cookies = _load_cookie_cache()
+        if cookies:
+            logger.info("Loaded cookies from cache")
+
+    # 3. Try browser extraction (auto-detect)
     if not cookies:
         cookies = extract_from_browser()
+        if cookies:
+            _save_cookie_cache(cookies)
 
     if not cookies:
         raise RuntimeError(
@@ -275,7 +283,69 @@ def get_cookies() -> Dict[str, str]:
         )
 
     # Verify only for explicit auth failures; transient endpoint issues are tolerated.
-    verify_cookies(cookies["auth_token"], cookies["ct0"], cookies.get("cookie_string"))
+    try:
+        verify_cookies(cookies["auth_token"], cookies["ct0"], cookies.get("cookie_string"))
+    except RuntimeError:
+        # Auth failure — invalidate cache and re-extract from browser
+        logger.info("Cookie verification failed, invalidating cache and re-extracting")
+        invalidate_cookie_cache()
+        fresh_cookies = extract_from_browser()
+        if fresh_cookies:
+            _save_cookie_cache(fresh_cookies)
+            # Verify fresh cookies — if this also fails, let it raise
+            verify_cookies(fresh_cookies["auth_token"], fresh_cookies["ct0"], fresh_cookies.get("cookie_string"))
+            return fresh_cookies
+        raise
     return cookies
 
 
+# ── Cookie file cache ───────────────────────────────────────────────────
+
+_CACHE_DIR = os.path.join(os.path.expanduser("~"), ".cache", "twitter-cli")
+_CACHE_FILE = os.path.join(_CACHE_DIR, "cookies.json")
+_CACHE_TTL_SECONDS = 24 * 3600  # 24 hours
+
+
+def _load_cookie_cache():
+    # type: () -> Optional[Dict[str, str]]
+    """Load cookies from file cache if within TTL."""
+    try:
+        if not os.path.exists(_CACHE_FILE):
+            return None
+        import time as _time
+        mtime = os.path.getmtime(_CACHE_FILE)
+        if _time.time() - mtime > _CACHE_TTL_SECONDS:
+            logger.debug("Cookie cache expired (>%ds)", _CACHE_TTL_SECONDS)
+            return None
+        with open(_CACHE_FILE, "r", encoding="utf-8") as f:
+            data = json.load(f)
+        if isinstance(data, dict) and "auth_token" in data and "ct0" in data:
+            return data
+    except Exception as exc:
+        logger.debug("Failed to load cookie cache: %s", exc)
+    return None
+
+
+def _save_cookie_cache(cookies):
+    # type: (Dict[str, str]) -> None
+    """Save cookies to file cache."""
+    try:
+        os.makedirs(_CACHE_DIR, exist_ok=True)
+        with open(_CACHE_FILE, "w", encoding="utf-8") as f:
+            json.dump(cookies, f, ensure_ascii=False)
+        # Restrict permissions — cookies are sensitive
+        os.chmod(_CACHE_FILE, 0o600)
+        logger.info("Saved cookies to cache (%s)", _CACHE_FILE)
+    except Exception as exc:
+        logger.debug("Failed to save cookie cache: %s", exc)
+
+
+def invalidate_cookie_cache():
+    # type: () -> None
+    """Delete the cookie cache file."""
+    try:
+        if os.path.exists(_CACHE_FILE):
+            os.remove(_CACHE_FILE)
+            logger.info("Cookie cache invalidated")
+    except Exception as exc:
+        logger.debug("Failed to invalidate cookie cache: %s", exc)
diff --git a/twitter_cli/cli.py b/twitter_cli/cli.py
index cac833a..532d358 100644
--- a/twitter_cli/cli.py
+++ b/twitter_cli/cli.py
@@ -28,6 +28,8 @@ import sys
 import time
 from pathlib import Path
 
+import json
+
 import click
 from rich.console import Console
 
@@ -43,7 +45,7 @@ from .formatter import (
     print_user_profile,
     print_user_table,
 )
-from .serialization import tweets_from_json, tweets_to_json, users_to_json
+from .serialization import tweets_from_json, tweets_to_json, user_profile_to_dict, users_to_json
 
 
 console = Console(stderr=True)
@@ -223,8 +225,9 @@ def favorites(max_count, as_json, output_file, do_filter):
 
 @cli.command()
 @click.argument("screen_name")
-def user(screen_name):
-    # type: (str,) -> None
+@click.option("--json", "as_json", is_flag=True, help="Output as JSON.")
+def user(screen_name, as_json):
+    # type: (str, bool) -> None
     """View a user's profile. SCREEN_NAME is the @handle (without @)."""
     screen_name = screen_name.lstrip("@")
     config = load_config()
@@ -236,8 +239,11 @@ def user(screen_name):
         console.print("[red]❌ %s[/red]" % exc)
         sys.exit(1)
 
-    console.print()
-    print_user_profile(profile, console)
+    if as_json:
+        click.echo(json.dumps(user_profile_to_dict(profile), ensure_ascii=False, indent=2))
+    else:
+        console.print()
+        print_user_profile(profile, console)
 
 
 @cli.command("user-posts")
diff --git a/uv.lock b/uv.lock
index c982d3a..b909e2c 100644
--- a/uv.lock
+++ b/uv.lock
@@ -950,7 +950,7 @@ wheels = [
 
 [[package]]
 name = "twitter-cli"
-version = "0.4.4"
+version = "0.4.6"
 source = { editable = "." }
 dependencies = [
     { name = "beautifulsoup4" },