diff --git a/.clang-tidy b/.clang-tidy
index 4fccdecb73..4dcabfcc42 100644
--- a/.clang-tidy
+++ b/.clang-tidy
@@ -20,7 +20,6 @@ Checks: >
   -performance-no-int-to-ptr,
   cppcoreguidelines-*,
   -cppcoreguidelines-avoid-magic-numbers,
-  -cppcoreguidelines-init-variables,
   -cppcoreguidelines-narrowing-conversions,
   -cppcoreguidelines-macro-to-enum,
   -cppcoreguidelines-avoid-non-const-global-variables,
diff --git a/packages/bun-usockets/src/bsd.c b/packages/bun-usockets/src/bsd.c
index 01c1a82d81..30a0dde59f 100644
--- a/packages/bun-usockets/src/bsd.c
+++ b/packages/bun-usockets/src/bsd.c
@@ -593,6 +593,7 @@ LIBUS_SOCKET_DESCRIPTOR bsd_create_socket(int domain, int type, int protocol, in
         *err = 0;
     }
 
+    // NOLINTNEXTLINE(cppcoreguidelines-init-variables)
     LIBUS_SOCKET_DESCRIPTOR created_fd;
 #if defined(SOCK_CLOEXEC) && defined(SOCK_NONBLOCK)
     const int flags = SOCK_CLOEXEC | SOCK_NONBLOCK;
@@ -696,6 +697,7 @@ int bsd_addr_get_port(struct bsd_addr_t *addr) {
 
 // called by dispatch_ready_poll
 LIBUS_SOCKET_DESCRIPTOR bsd_accept_socket(LIBUS_SOCKET_DESCRIPTOR fd, struct bsd_addr_t *addr) {
+    // NOLINTNEXTLINE(cppcoreguidelines-init-variables)
     LIBUS_SOCKET_DESCRIPTOR accepted_fd;
 
     while (1) {
@@ -855,7 +857,7 @@ int bsd_would_block() {
 }
 
 static int us_internal_bind_and_listen(LIBUS_SOCKET_DESCRIPTOR listenFd, struct sockaddr *listenAddr, socklen_t listenAddrLength, int backlog, int* error) {
-    int result;
+    int result = 0;
     do
         result = bind(listenFd, listenAddr, listenAddrLength);
     while (IS_EINTR(result));
@@ -973,7 +975,7 @@ inline __attribute__((always_inline)) LIBUS_SOCKET_DESCRIPTOR bsd_bind_listen_fd
 // return LIBUS_SOCKET_ERROR or the fd that represents listen socket
 // listen both on ipv6 and ipv4
 LIBUS_SOCKET_DESCRIPTOR bsd_create_listen_socket(const char *host, int port, int options, int* error) {
-    struct addrinfo hints, *result;
+    struct addrinfo hints, *result = NULL;
     memset(&hints, 0, sizeof(struct addrinfo));
 
     hints.ai_flags = AI_PASSIVE;
@@ -988,7 +990,7 @@ LIBUS_SOCKET_DESCRIPTOR bsd_create_listen_socket(const char *host, int port, int
     }
 
     LIBUS_SOCKET_DESCRIPTOR listenFd = LIBUS_SOCKET_ERROR;
-    struct addrinfo *listenAddr;
+    struct addrinfo* listenAddr = NULL;
     for (struct addrinfo *a = result; a != NULL; a = a->ai_next) {
         if (a->ai_family == AF_INET6) {
             listenFd = bsd_create_socket(a->ai_family, a->ai_socktype, a->ai_protocol, NULL);
@@ -1174,7 +1176,7 @@ LIBUS_SOCKET_DESCRIPTOR bsd_create_udp_socket(const char *host, int port, int op
         *err = 0;
     }
 
-    struct addrinfo hints, *result;
+    struct addrinfo hints, *result = NULL;
     memset(&hints, 0, sizeof(struct addrinfo));
 
     hints.ai_flags = AI_PASSIVE;
@@ -1284,7 +1286,7 @@ LIBUS_SOCKET_DESCRIPTOR bsd_create_udp_socket(const char *host, int port, int op
 }
 
 int bsd_connect_udp_socket(LIBUS_SOCKET_DESCRIPTOR fd, const char *host, int port) {
-    struct addrinfo hints, *result;
+    struct addrinfo hints, *result = NULL;
     memset(&hints, 0, sizeof(struct addrinfo));
 
     hints.ai_family = AF_UNSPEC;
@@ -1394,8 +1396,8 @@ static int bsd_do_connect_raw(LIBUS_SOCKET_DESCRIPTOR fd, struct sockaddr *addr,
 
 
 #else
-    int r;
-     do {
+    int r = 0;
+    do {
         errno = 0;
         r = connect(fd, (struct sockaddr *)addr, namelen);
     } while (IS_EINTR(r));
diff --git a/packages/bun-usockets/src/context.c b/packages/bun-usockets/src/context.c
index 6e2c3f3e18..76ffcc841c 100644
--- a/packages/bun-usockets/src/context.c
+++ b/packages/bun-usockets/src/context.c
@@ -517,7 +517,7 @@ void *us_socket_context_connect(int ssl, struct us_socket_context_t *context, co
         return us_socket_context_connect_resolved_dns(context, &addr, options, socket_ext_size);
     }
 
-    struct addrinfo_request* ai_req;
+    struct addrinfo_request* ai_req = NULL;
     if (Bun__addrinfo_get(loop, host, (uint16_t)port, &ai_req) == 0) {
         // fast path for cached results
         struct addrinfo_result *result = Bun__addrinfo_getRequestResult(ai_req);
diff --git a/packages/bun-usockets/src/crypto/openssl.c b/packages/bun-usockets/src/crypto/openssl.c
index 04597b1b97..7b5dad349e 100644
--- a/packages/bun-usockets/src/crypto/openssl.c
+++ b/packages/bun-usockets/src/crypto/openssl.c
@@ -808,7 +808,7 @@ create_ssl_context_from_options(struct us_socket_context_options_t options) {
   }
 
   if (options.ca_file_name) {
-    STACK_OF(X509_NAME) * ca_list;
+    STACK_OF(X509_NAME) * ca_list = NULL;
     ca_list = SSL_load_client_CA_file(options.ca_file_name);
     if (ca_list == NULL) {
       free_ssl_context(ssl_context);
@@ -826,7 +826,7 @@ create_ssl_context_from_options(struct us_socket_context_options_t options) {
   if (options.dh_params_file_name) {
     /* Set up ephemeral DH parameters. */
     DH *dh_2048 = NULL;
-    FILE *paramfile;
+    FILE *paramfile = NULL;
     paramfile = fopen(options.dh_params_file_name, "r");
 
     if (paramfile) {
@@ -882,8 +882,8 @@ create_ssl_context_from_options(struct us_socket_context_options_t options) {
 
 int us_ssl_ctx_use_privatekey_content(SSL_CTX *ctx, const char *content,
                                       int type) {
-  int reason_code, ret = 0;
-  BIO *in;
+  int reason_code = 0, ret = 0;
+  BIO *in = NULL;
   EVP_PKEY *pkey = NULL;
   in = BIO_new_mem_buf(content, strlen(content));
   if (in == NULL) {
@@ -948,7 +948,7 @@ end:
 }
 
 int us_ssl_ctx_use_certificate_chain(SSL_CTX *ctx, const char *content) {
-  BIO *in;
+  BIO *in = NULL;
   int ret = 0;
   X509 *x = NULL;
 
@@ -976,9 +976,9 @@ int us_ssl_ctx_use_certificate_chain(SSL_CTX *ctx, const char *content) {
   if (ret) {
     // If we could set up our certificate, now proceed to the CA
     // certificates.
-    X509 *ca;
-    int r;
-    uint32_t err;
+    X509 *ca = NULL;
+    int r = 0;
+    uint32_t err = 0;
 
     SSL_CTX_clear_chain_certs(ctx);
 
@@ -1203,7 +1203,7 @@ SSL_CTX *create_ssl_context_from_bun_options(
   if (options.ca_file_name) {
     SSL_CTX_set_cert_store(ssl_context, us_get_default_ca_store());
 
-    STACK_OF(X509_NAME) * ca_list;
+    STACK_OF(X509_NAME) * ca_list = NULL;
     ca_list = SSL_load_client_CA_file(options.ca_file_name);
     if (ca_list == NULL) {
       *err = CREATE_BUN_SOCKET_ERROR_LOAD_CA_FILE;
@@ -1269,7 +1269,7 @@ SSL_CTX *create_ssl_context_from_bun_options(
   if (options.dh_params_file_name) {
     /* Set up ephemeral DH parameters. */
     DH *dh_2048 = NULL;
-    FILE *paramfile;
+    FILE *paramfile = NULL;
     paramfile = fopen(options.dh_params_file_name, "r");
 
     if (paramfile) {
diff --git a/packages/bun-usockets/src/eventing/epoll_kqueue.c b/packages/bun-usockets/src/eventing/epoll_kqueue.c
index baec1b4df4..5ece52f419 100644
--- a/packages/bun-usockets/src/eventing/epoll_kqueue.c
+++ b/packages/bun-usockets/src/eventing/epoll_kqueue.c
@@ -366,7 +366,7 @@ int kqueue_change(int kqfd, int fd, int old_events, int new_events, void *user_d
         /* Do they differ in writable? */
         EV_SET64(&change_list[change_length++], fd, EVFILT_WRITE, (new_events & LIBUS_SOCKET_WRITABLE) ? EV_ADD : EV_DELETE, 0, 0, (uint64_t)(void*)user_data, 0, 0);
     }
-    int ret;
+    int ret = 0;
     do {
         ret = kevent64(kqfd, change_list, change_length, change_list, change_length, KEVENT_FLAG_ERROR_EVENTS, NULL);
     } while (IS_EINTR(ret));
@@ -564,7 +564,7 @@ void us_timer_close(struct us_timer_t *timer, int fallthrough) {
 
     struct kevent64_s event;
     EV_SET64(&event, (uint64_t) (void*) internal_cb, EVFILT_TIMER, EV_DELETE, 0, 0, (uint64_t)internal_cb, 0, 0);
-    int ret;
+    int ret = 0;
     do {
         ret = kevent64(internal_cb->loop->fd, &event, 1, &event, 1, KEVENT_FLAG_ERROR_EVENTS, NULL);
     } while (IS_EINTR(ret));
@@ -588,7 +588,7 @@ void us_timer_set(struct us_timer_t *t, void (*cb)(struct us_timer_t *t), int ms
     uint64_t ptr = (uint64_t)(void*)internal_cb;
     EV_SET64(&event, ptr, EVFILT_TIMER, EV_ADD | (repeat_ms ? 0 : EV_ONESHOT), 0, ms, (uint64_t)internal_cb, 0, 0);
 
-    int ret;
+    int ret = 0;
     do {
         ret = kevent64(internal_cb->loop->fd, &event, 1, &event, 1, KEVENT_FLAG_ERROR_EVENTS, NULL);
     } while (IS_EINTR(ret));
@@ -687,7 +687,7 @@ void us_internal_async_close(struct us_internal_async *a) {
     uint64_t ptr = (uint64_t)(void*)internal_cb;
     EV_SET64(&event, ptr, EVFILT_MACHPORT, EV_DELETE, 0, 0, (uint64_t)(void*)internal_cb, 0,0);
 
-    int ret;
+    int ret = 0;
     do {
         ret = kevent64(internal_cb->loop->fd, &event, 1, &event, 1, KEVENT_FLAG_ERROR_EVENTS, NULL);
     } while (IS_EINTR(ret));
@@ -718,7 +718,7 @@ void us_internal_async_set(struct us_internal_async *a, void (*cb)(struct us_int
     event.ext[1] = MACHPORT_BUF_LEN;
     event.udata = (uint64_t)(void*)internal_cb;
 
-    int ret;
+    int ret = 0;
     do {
         ret = kevent64(internal_cb->loop->fd, &event, 1, &event, 1, KEVENT_FLAG_ERROR_EVENTS, NULL);
     } while (IS_EINTR(ret));
diff --git a/packages/bun-usockets/src/loop.c b/packages/bun-usockets/src/loop.c
index acc0806f4d..7454c3a72f 100644
--- a/packages/bun-usockets/src/loop.c
+++ b/packages/bun-usockets/src/loop.c
@@ -181,7 +181,7 @@ static const int MAX_LOW_PRIO_SOCKETS_PER_LOOP_ITERATION = 5;
 
 void us_internal_handle_low_priority_sockets(struct us_loop_t *loop) {
     struct us_internal_loop_data_t *loop_data = &loop->data;
-    struct us_socket_t *s;
+    struct us_socket_t *s = NULL;
 
     loop_data->low_prio_budget = MAX_LOW_PRIO_SOCKETS_PER_LOOP_ITERATION;
 
@@ -425,7 +425,7 @@ void us_internal_dispatch_ready_poll(struct us_poll_t *p, int error, int eof, in
                       const int recv_flags = MSG_DONTWAIT | MSG_NOSIGNAL;
                     #endif
 
-                    int length;
+                    int length = 0;
                     #if !defined(_WIN32)
                     if(s->flags.is_ipc) {
                         struct msghdr msg = {0};
diff --git a/src/bun.js/bindings/uv-posix-polyfills.c b/src/bun.js/bindings/uv-posix-polyfills.c
index e32086ff07..eb9460d475 100644
--- a/src/bun.js/bindings/uv-posix-polyfills.c
+++ b/src/bun.js/bindings/uv-posix-polyfills.c
@@ -74,7 +74,7 @@ UV_EXTERN void uv_mutex_destroy(uv_mutex_t* mutex)
 UV_EXTERN int uv_mutex_init(uv_mutex_t* mutex)
 {
     pthread_mutexattr_t attr;
-    int err;
+    int err = 0;
 
     if (pthread_mutexattr_init(&attr))
         abort();
@@ -94,7 +94,7 @@ UV_EXTERN int uv_mutex_init(uv_mutex_t* mutex)
 UV_EXTERN int uv_mutex_init_recursive(uv_mutex_t* mutex)
 {
     pthread_mutexattr_t attr;
-    int err;
+    int err = 0;
 
     if (pthread_mutexattr_init(&attr))
         abort();
@@ -120,7 +120,7 @@ UV_EXTERN void uv_mutex_lock(uv_mutex_t* mutex)
 // Copy-pasted from libuv
 UV_EXTERN int uv_mutex_trylock(uv_mutex_t* mutex)
 {
-    int err;
+    int err = 0;
 
     err = pthread_mutex_trylock(mutex);
     if (err) {