diff --git a/docs/changes.xml b/docs/changes.xml
index 569e49e5..f086e78f 100644
--- a/docs/changes.xml
+++ b/docs/changes.xml
@@ -45,6 +45,12 @@ this allows to do './configure && make && sudo make install'.
 </para>
 </change>
 
+<change type="bugfix">
+<para>
+fix the memory leak related to njs.
+</para>
+</change>
+
 </changes>
 
 <changes apply="unit-php
diff --git a/src/nxt_conf_validation.c b/src/nxt_conf_validation.c
index bf8aa760..537a3fb7 100644
--- a/src/nxt_conf_validation.c
+++ b/src/nxt_conf_validation.c
@@ -1284,25 +1284,35 @@ nxt_conf_validate(nxt_conf_validation_t *vldt)
 
     vldt->tstr_state = nxt_tstr_state_new(vldt->pool, 1);
     if (nxt_slow_path(vldt->tstr_state == NULL)) {
-        return NXT_ERROR;
+        ret = NXT_ERROR;
+        goto fail;
     }
 
     ret = nxt_conf_vldt_type(vldt, NULL, vldt->conf, NXT_CONF_VLDT_OBJECT);
     if (ret != NXT_OK) {
-        return ret;
+        goto fail;
     }
 
     ret = nxt_conf_vldt_object(vldt, vldt->conf, nxt_conf_vldt_root_members);
     if (ret != NXT_OK) {
-        return ret;
+        goto fail;
     }
 
     ret = nxt_tstr_state_done(vldt->tstr_state, error);
     if (ret != NXT_OK) {
-        return nxt_conf_vldt_error(vldt, "%s", error);
+        ret = nxt_conf_vldt_error(vldt, "%s", error);
+        goto fail;
     }
 
+    nxt_tstr_state_release(vldt->tstr_state);
+
     return NXT_OK;
+
+fail:
+
+    nxt_tstr_state_release(vldt->tstr_state);
+
+    return ret;
 }
 
 
diff --git a/src/nxt_http_request.c b/src/nxt_http_request.c
index 73ffd2f0..e78975aa 100644
--- a/src/nxt_http_request.c
+++ b/src/nxt_http_request.c
@@ -833,6 +833,10 @@ nxt_http_request_close_handler(nxt_task_t *task, void *obj, void *data)
         r->body->file->fd = -1;
     }
 
+    if (r->tstr_query != NULL) {
+        nxt_tstr_query_release(r->tstr_query);
+    }
+
     if (nxt_fast_path(proto.any != NULL)) {
         protocol = r->protocol;
 
diff --git a/src/nxt_js.c b/src/nxt_js.c
index aa3c4af5..4327e848 100644
--- a/src/nxt_js.c
+++ b/src/nxt_js.c
@@ -46,6 +46,7 @@ nxt_js_conf_new(nxt_mp_t *mp)
 
     jcf->funcs = nxt_array_create(mp, 4, sizeof(nxt_str_t));
     if (nxt_slow_path(jcf->funcs == NULL)) {
+        njs_vm_destroy(jcf->vm);
         return NULL;
     }
 
@@ -53,6 +54,13 @@ nxt_js_conf_new(nxt_mp_t *mp)
 }
 
 
+void
+nxt_js_conf_release(nxt_js_conf_t *jcf)
+{
+    njs_vm_destroy(jcf->vm);
+}
+
+
 void
 nxt_js_set_proto(nxt_js_conf_t *jcf, njs_external_t *proto, njs_uint_t n)
 {
@@ -297,3 +305,12 @@ nxt_js_call(nxt_task_t *task, nxt_js_cache_t *cache, nxt_js_t *js,
 
     return NXT_OK;
 }
+
+
+void
+nxt_js_release(nxt_js_cache_t *cache)
+{
+    if (cache->vm != NULL) {
+        njs_vm_destroy(cache->vm);
+    }
+}
diff --git a/src/nxt_js.h b/src/nxt_js.h
index dea43fe3..74d041ca 100644
--- a/src/nxt_js.h
+++ b/src/nxt_js.h
@@ -22,12 +22,14 @@ typedef struct {
 
 
 nxt_js_conf_t *nxt_js_conf_new(nxt_mp_t *mp);
+void nxt_js_conf_release(nxt_js_conf_t *jcf);
 void nxt_js_set_proto(nxt_js_conf_t *jcf, njs_external_t *proto, nxt_uint_t n);
 nxt_js_t *nxt_js_add_tpl(nxt_js_conf_t *jcf, nxt_str_t *str, nxt_bool_t strz);
 nxt_int_t nxt_js_compile(nxt_js_conf_t *jcf);
 nxt_int_t nxt_js_test(nxt_js_conf_t *jcf, nxt_str_t *str, u_char *error);
 nxt_int_t nxt_js_call(nxt_task_t *task, nxt_js_cache_t *cache, nxt_js_t *js,
     nxt_str_t *str, void *ctx);
+void nxt_js_release(nxt_js_cache_t *cache);
 
 
 extern njs_int_t  nxt_js_proto_id;
diff --git a/src/nxt_router.c b/src/nxt_router.c
index edc015c5..17f6c572 100644
--- a/src/nxt_router.c
+++ b/src/nxt_router.c
@@ -1111,6 +1111,10 @@ temp_fail:
 
 fail:
 
+    if (rtcf->tstr_state != NULL) {
+        nxt_tstr_state_release(rtcf->tstr_state);
+    }
+
     nxt_mp_destroy(mp);
 
     return NULL;
@@ -3794,6 +3798,8 @@ nxt_router_conf_release(nxt_task_t *task, nxt_socket_conf_joint_t *joint)
 
         nxt_router_access_log_release(task, lock, rtcf->access_log);
 
+        nxt_tstr_state_release(rtcf->tstr_state);
+
         nxt_mp_thread_adopt(rtcf->mem_pool);
 
         nxt_mp_destroy(rtcf->mem_pool);
diff --git a/src/nxt_tstr.c b/src/nxt_tstr.c
index fd01797c..fda585b8 100644
--- a/src/nxt_tstr.c
+++ b/src/nxt_tstr.c
@@ -194,6 +194,15 @@ nxt_tstr_state_done(nxt_tstr_state_t *state, u_char *error)
 }
 
 
+void
+nxt_tstr_state_release(nxt_tstr_state_t *state)
+{
+#if (NXT_HAVE_NJS)
+    nxt_js_conf_release(state->jcf);
+#endif
+}
+
+
 nxt_bool_t
 nxt_tstr_is_const(nxt_tstr_t *tstr)
 {
@@ -315,3 +324,12 @@ nxt_tstr_query_handle(nxt_task_t *task, nxt_tstr_query_t *query,
                            task, query->ctx, query->data);
     }
 }
+
+
+void
+nxt_tstr_query_release(nxt_tstr_query_t *query)
+{
+#if (NXT_HAVE_NJS)
+    nxt_js_release(&query->cache->js);
+#endif
+}
diff --git a/src/nxt_tstr.h b/src/nxt_tstr.h
index 0cc24292..ce8e6f3a 100644
--- a/src/nxt_tstr.h
+++ b/src/nxt_tstr.h
@@ -42,6 +42,7 @@ nxt_tstr_t *nxt_tstr_compile(nxt_tstr_state_t *state, nxt_str_t *str,
     nxt_tstr_flags_t flags);
 nxt_int_t nxt_tstr_test(nxt_tstr_state_t *state, nxt_str_t *str, u_char *error);
 nxt_int_t nxt_tstr_state_done(nxt_tstr_state_t *state, u_char *error);
+void nxt_tstr_state_release(nxt_tstr_state_t *state);
 
 nxt_bool_t nxt_tstr_is_const(nxt_tstr_t *tstr);
 void nxt_tstr_str(nxt_tstr_t *tstr, nxt_str_t *str);
@@ -55,6 +56,7 @@ void nxt_tstr_query_resolve(nxt_task_t *task, nxt_tstr_query_t *query,
     void *data, nxt_work_handler_t ready, nxt_work_handler_t error);
 void nxt_tstr_query_handle(nxt_task_t *task, nxt_tstr_query_t *query,
     nxt_bool_t failed);
+void nxt_tstr_query_release(nxt_tstr_query_t *query);
 
 
 nxt_inline nxt_bool_t