diff --git a/examples/server/README.md b/examples/server/README.md
index 23606b32a..376739051 100644
--- a/examples/server/README.md
+++ b/examples/server/README.md
@@ -556,9 +556,51 @@ Run with bash:
 bash chat.sh
 ```
 
-### API like OAI
+### OAI-like API
 
-The HTTP server supports OAI-like API
+The HTTP server supports OAI-like API: https://github.com/openai/openai-openapi
+
+### API errors
+
+Server returns error in the same format as OAI: https://github.com/openai/openai-openapi
+
+Example of an error:
+
+```json
+{
+    "error": {
+        "code": 401,
+        "message": "Invalid API Key",
+        "type": "authentication_error"
+    }
+}
+```
+
+Apart from error types supported by OAI, we also have custom types that are specific to functionalities of llama.cpp:
+
+**When /metrics or /slots endpoint is disabled**
+
+```json
+{
+    "error": {
+        "code": 501,
+        "message": "This server does not support metrics endpoint.",
+        "type": "not_supported_error"
+    }
+}
+```
+
+**When the server receives invalid grammar via */completions endpoint**
+
+```json
+{
+    "error": {
+        "code": 400,
+        "message": "Failed to parse grammar",
+        "type": "invalid_request_error"
+    }
+}
+```
 
 ### Extending or building alternative Web Front End
 
diff --git a/examples/server/completion.js.hpp b/examples/server/completion.js.hpp
index f5e696e17..10734091e 100644
--- a/examples/server/completion.js.hpp
+++ b/examples/server/completion.js.hpp
@@ -231,255 +231,256 @@ unsigned char completion_js[] = {
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-  0x20, 0x7d, 0x0a, 0x7d, 0x0a, 0x0a, 0x2f, 0x2f, 0x20, 0x47, 0x65, 0x74,
-  0x20, 0x74, 0x68, 0x65, 0x20, 0x6d, 0x6f, 0x64, 0x65, 0x6c, 0x20, 0x69,
-  0x6e, 0x66, 0x6f, 0x20, 0x66, 0x72, 0x6f, 0x6d, 0x20, 0x74, 0x68, 0x65,
-  0x20, 0x73, 0x65, 0x72, 0x76, 0x65, 0x72, 0x2e, 0x20, 0x54, 0x68, 0x69,
-  0x73, 0x20, 0x69, 0x73, 0x20, 0x75, 0x73, 0x65, 0x66, 0x75, 0x6c, 0x20,
-  0x66, 0x6f, 0x72, 0x20, 0x67, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67, 0x20,
-  0x74, 0x68, 0x65, 0x20, 0x63, 0x6f, 0x6e, 0x74, 0x65, 0x78, 0x74, 0x20,
-  0x77, 0x69, 0x6e, 0x64, 0x6f, 0x77, 0x20, 0x61, 0x6e, 0x64, 0x20, 0x73,
-  0x6f, 0x20, 0x6f, 0x6e, 0x2e, 0x0a, 0x65, 0x78, 0x70, 0x6f, 0x72, 0x74,
-  0x20, 0x63, 0x6f, 0x6e, 0x73, 0x74, 0x20, 0x6c, 0x6c, 0x61, 0x6d, 0x61,
-  0x4d, 0x6f, 0x64, 0x65, 0x6c, 0x49, 0x6e, 0x66, 0x6f, 0x20, 0x3d, 0x20,
-  0x61, 0x73, 0x79, 0x6e, 0x63, 0x20, 0x28, 0x29, 0x20, 0x3d, 0x3e, 0x20,
-  0x7b, 0x0a, 0x20, 0x20, 0x69, 0x66, 0x20, 0x28, 0x21, 0x67, 0x65, 0x6e,
-  0x65, 0x72, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x5f, 0x73, 0x65, 0x74, 0x74,
-  0x69, 0x6e, 0x67, 0x73, 0x29, 0x20, 0x7b, 0x0a, 0x20, 0x20, 0x20, 0x20,
-  0x63, 0x6f, 0x6e, 0x73, 0x74, 0x20, 0x70, 0x72, 0x6f, 0x70, 0x73, 0x20,
-  0x3d, 0x20, 0x61, 0x77, 0x61, 0x69, 0x74, 0x20, 0x66, 0x65, 0x74, 0x63,
-  0x68, 0x28, 0x22, 0x2f, 0x70, 0x72, 0x6f, 0x70, 0x73, 0x22, 0x29, 0x2e,
-  0x74, 0x68, 0x65, 0x6e, 0x28, 0x72, 0x20, 0x3d, 0x3e, 0x20, 0x72, 0x2e,
-  0x6a, 0x73, 0x6f, 0x6e, 0x28, 0x29, 0x29, 0x3b, 0x0a, 0x20, 0x20, 0x20,
-  0x20, 0x67, 0x65, 0x6e, 0x65, 0x72, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x5f,
-  0x73, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67, 0x73, 0x20, 0x3d, 0x20, 0x70,
-  0x72, 0x6f, 0x70, 0x73, 0x2e, 0x64, 0x65, 0x66, 0x61, 0x75, 0x6c, 0x74,
-  0x5f, 0x67, 0x65, 0x6e, 0x65, 0x72, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x5f,
-  0x73, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67, 0x73, 0x3b, 0x0a, 0x20, 0x20,
-  0x7d, 0x0a, 0x20, 0x20, 0x72, 0x65, 0x74, 0x75, 0x72, 0x6e, 0x20, 0x67,
+  0x20, 0x6f, 0x66, 0x20, 0x6c, 0x6c, 0x61, 0x6d, 0x61, 0x28, 0x70, 0x61,
+  0x72, 0x61, 0x6d, 0x73, 0x2e, 0x70, 0x72, 0x6f, 0x6d, 0x70, 0x74, 0x2c,
+  0x20, 0x70, 0x61, 0x72, 0x61, 0x6d, 0x73, 0x2c, 0x20, 0x7b, 0x20, 0x63,
+  0x6f, 0x6e, 0x74, 0x72, 0x6f, 0x6c, 0x6c, 0x65, 0x72, 0x20, 0x7d, 0x29,
+  0x29, 0x20, 0x7b, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x63, 0x61, 0x6c, 0x6c,
+  0x62, 0x61, 0x63, 0x6b, 0x28, 0x63, 0x68, 0x75, 0x6e, 0x6b, 0x29, 0x3b,
+  0x0a, 0x20, 0x20, 0x7d, 0x0a, 0x7d, 0x0a, 0x0a, 0x2f, 0x2f, 0x20, 0x47,
+  0x65, 0x74, 0x20, 0x74, 0x68, 0x65, 0x20, 0x6d, 0x6f, 0x64, 0x65, 0x6c,
+  0x20, 0x69, 0x6e, 0x66, 0x6f, 0x20, 0x66, 0x72, 0x6f, 0x6d, 0x20, 0x74,
+  0x68, 0x65, 0x20, 0x73, 0x65, 0x72, 0x76, 0x65, 0x72, 0x2e, 0x20, 0x54,
+  0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x75, 0x73, 0x65, 0x66, 0x75,
+  0x6c, 0x20, 0x66, 0x6f, 0x72, 0x20, 0x67, 0x65, 0x74, 0x74, 0x69, 0x6e,
+  0x67, 0x20, 0x74, 0x68, 0x65, 0x20, 0x63, 0x6f, 0x6e, 0x74, 0x65, 0x78,
+  0x74, 0x20, 0x77, 0x69, 0x6e, 0x64, 0x6f, 0x77, 0x20, 0x61, 0x6e, 0x64,
+  0x20, 0x73, 0x6f, 0x20, 0x6f, 0x6e, 0x2e, 0x0a, 0x65, 0x78, 0x70, 0x6f,
+  0x72, 0x74, 0x20, 0x63, 0x6f, 0x6e, 0x73, 0x74, 0x20, 0x6c, 0x6c, 0x61,
+  0x6d, 0x61, 0x4d, 0x6f, 0x64, 0x65, 0x6c, 0x49, 0x6e, 0x66, 0x6f, 0x20,
+  0x3d, 0x20, 0x61, 0x73, 0x79, 0x6e, 0x63, 0x20, 0x28, 0x29, 0x20, 0x3d,
+  0x3e, 0x20, 0x7b, 0x0a, 0x20, 0x20, 0x69, 0x66, 0x20, 0x28, 0x21, 0x67,
   0x65, 0x6e, 0x65, 0x72, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x5f, 0x73, 0x65,
-  0x74, 0x74, 0x69, 0x6e, 0x67, 0x73, 0x3b, 0x0a, 0x7d, 0x0a
+  0x74, 0x74, 0x69, 0x6e, 0x67, 0x73, 0x29, 0x20, 0x7b, 0x0a, 0x20, 0x20,
+  0x20, 0x20, 0x63, 0x6f, 0x6e, 0x73, 0x74, 0x20, 0x70, 0x72, 0x6f, 0x70,
+  0x73, 0x20, 0x3d, 0x20, 0x61, 0x77, 0x61, 0x69, 0x74, 0x20, 0x66, 0x65,
+  0x74, 0x63, 0x68, 0x28, 0x22, 0x2f, 0x70, 0x72, 0x6f, 0x70, 0x73, 0x22,
+  0x29, 0x2e, 0x74, 0x68, 0x65, 0x6e, 0x28, 0x72, 0x20, 0x3d, 0x3e, 0x20,
+  0x72, 0x2e, 0x6a, 0x73, 0x6f, 0x6e, 0x28, 0x29, 0x29, 0x3b, 0x0a, 0x20,
+  0x20, 0x20, 0x20, 0x67, 0x65, 0x6e, 0x65, 0x72, 0x61, 0x74, 0x69, 0x6f,
+  0x6e, 0x5f, 0x73, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67, 0x73, 0x20, 0x3d,
+  0x20, 0x70, 0x72, 0x6f, 0x70, 0x73, 0x2e, 0x64, 0x65, 0x66, 0x61, 0x75,
+  0x6c, 0x74, 0x5f, 0x67, 0x65, 0x6e, 0x65, 0x72, 0x61, 0x74, 0x69, 0x6f,
+  0x6e, 0x5f, 0x73, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67, 0x73, 0x3b, 0x0a,
+  0x20, 0x20, 0x7d, 0x0a, 0x20, 0x20, 0x72, 0x65, 0x74, 0x75, 0x72, 0x6e,
+  0x20, 0x67, 0x65, 0x6e, 0x65, 0x72, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x5f,
+  0x73, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67, 0x73, 0x3b, 0x0a, 0x7d, 0x0a
 };
-unsigned int completion_js_len = 5782;
+unsigned int completion_js_len = 5796;
diff --git a/examples/server/public/completion.js b/examples/server/public/completion.js
index ab38a7b40..835ce6e68 100644
--- a/examples/server/public/completion.js
+++ b/examples/server/public/completion.js
@@ -96,18 +96,18 @@ export async function* llama(prompt, params = {}, config = {}) {
             }
           }
           if (result.error) {
-            result.error = JSON.parse(result.error);
-            if (result.error.content.includes('slot unavailable')) {
-              // Throw an error to be caught by upstream callers
-              throw new Error('slot unavailable');
-            } else {
-              console.error(`llama.cpp error: ${result.error.content}`);
+            try {
+              result.error = JSON.parse(result.error);
+              if (result.error.message.includes('slot unavailable')) {
+                // Throw an error to be caught by upstream callers
+                throw new Error('slot unavailable');
+              } else {
+                console.error(`llama.cpp error [${result.error.code} - ${result.error.type}]: ${result.error.message}`);
+              }
+            } catch(e) {
+              console.error(`llama.cpp error ${result.error}`)
             }
           }
-          if (result.error) {
-            result.error = JSON.parse(result.error);
-            console.error(`llama.cpp error: ${result.error.content}`);
-          }
         }
       }
     }
diff --git a/examples/server/server.cpp b/examples/server/server.cpp
index 3951507aa..b63a6f243 100644
--- a/examples/server/server.cpp
+++ b/examples/server/server.cpp
@@ -396,7 +396,7 @@ struct server_queue {
     // callback functions
     std::function<void(server_task       &)> callback_new_task;
     std::function<void(server_task_multi &)> callback_finish_multitask;
-    std::function<void(void)>                callback_run_slots;
+    std::function<void(void)>                callback_update_slots;
 
     // Add a new task to the end of the queue
     int post(server_task task) {
@@ -435,8 +435,8 @@ struct server_queue {
     }
 
     // Register the function to be called when all slots data is ready to be processed
-    void on_run_slots(std::function<void(void)> callback) {
-        callback_run_slots = std::move(callback);
+    void on_update_slots(std::function<void(void)> callback) {
+        callback_update_slots = std::move(callback);
     }
 
     // Call when the state of one slot is changed
@@ -461,7 +461,7 @@ struct server_queue {
      * - Wait until a new task arrives
      * - Process the task (i.e. maybe copy data into slot)
      * - Check if multitask is finished
-     * - Run all slots
+     * - Update all slots
      */
     void start_loop() {
         running = true;
@@ -499,9 +499,9 @@ struct server_queue {
             }
 
             // all tasks in the current loop is processed, slots data is now ready
-            LOG_VERBOSE("callback_run_slots", {});
+            LOG_VERBOSE("callback_update_slots", {});
 
-            callback_run_slots();
+            callback_update_slots();
 
             LOG_VERBOSE("wait for new task", {});
             {
@@ -805,9 +805,10 @@ struct server_context {
         return last_used;
     }
 
-    bool launch_slot_with_data(server_slot & slot, json data) const {
+    bool launch_slot_with_task(server_slot & slot, const server_task & task) {
         slot_params default_params;
         llama_sampling_params default_sparams;
+        auto & data = task.data;
 
         if (data.count("__oaicompat") != 0) {
             slot.oaicompat = true;
@@ -864,10 +865,15 @@ struct server_context {
         {
             const auto & prompt = data.find("prompt");
             if (prompt == data.end()) {
-                slot.prompt = "";
+                send_error(task, "Either \"prompt\" or \"messages\" must be provided", ERROR_TYPE_INVALID_REQUEST);
+                return false;
             } else {
                 slot.prompt = *prompt;
             }
+            if (slot.prompt.is_array() && slot.prompt.size() == 0) {
+                send_error(task, "\"prompt\" cannot be an empty array", ERROR_TYPE_INVALID_REQUEST);
+                return false;
+            }
         }
 
         // penalize user-provided tokens
@@ -926,6 +932,7 @@ struct server_context {
             if (logit_bias != data.end() && logit_bias->is_array()) {
                 const int n_vocab = llama_n_vocab(model);
                 for (const auto & el : *logit_bias) {
+                    // TODO: we may want to throw errors here, in case "el" is incorrect
                     if (el.is_array() && el.size() == 2) {
                         float bias;
                         if (el[1].is_number()) {
@@ -985,6 +992,11 @@ struct server_context {
                 llama_sampling_free(slot.ctx_sampling);
             }
             slot.ctx_sampling = llama_sampling_init(slot.sparams);
+            if (slot.ctx_sampling == nullptr) {
+                // for now, the only error that may happen here is invalid grammar
+                send_error(task, "Failed to parse grammar", ERROR_TYPE_INVALID_REQUEST);
+                return false;
+            }
             llama_set_rng_seed(ctx, slot.params.seed);
         }
 
@@ -1226,15 +1238,23 @@ struct server_context {
         };
     }
 
-    void send_error(const server_task & task, const std::string & error) {
-        LOG_TEE("task %i - error: %s\n", task.id, error.c_str());
+    void send_error(const server_task & task, const std::string & error, const enum error_type type = ERROR_TYPE_SERVER) {
+        send_error(task.id, task.id_multi, error, type);
+    }
+
+    void send_error(const server_slot & slot, const std::string & error, const enum error_type type = ERROR_TYPE_SERVER) {
+        send_error(slot.id_task, slot.id_multi, error, type);
+    }
+
+    void send_error(const int id_task, const int id_multi, const std::string & error, const enum error_type type = ERROR_TYPE_SERVER) {
+        LOG_TEE("task %i - error: %s\n", id_task, error.c_str());
 
         server_task_result res;
-        res.id       = task.id;
-        res.id_multi = task.id_multi;
+        res.id       = id_task;
+        res.id_multi = id_multi;
         res.stop     = false;
         res.error    = true;
-        res.data     = { { "content", error } };
+        res.data     = format_error_response(error, type);
 
         queue_results.send(res);
     }
@@ -1468,9 +1488,8 @@ struct server_context {
                     slot->infill    = task.infill;
                     slot->embedding = task.embedding;
 
-                    if (!launch_slot_with_data(*slot, task.data)) {
-                        // send error result
-                        send_error(task, "internal_error");
+                    if (!launch_slot_with_task(*slot, task)) {
+                        LOG_ERROR("error while launching slot", task.data);
                         break;
                     }
                 } break;
@@ -1587,7 +1606,7 @@ struct server_context {
         queue_results.send(result);
     }
 
-    bool update_slots() {
+    void update_slots() {
         if (system_need_update) {
             system_prompt_update();
         }
@@ -1630,7 +1649,7 @@ struct server_context {
                     kv_cache_clear();
                 }
 
-                return true;
+                return;
             }
         }
 
@@ -1975,8 +1994,7 @@ struct server_context {
 
         if (batch.n_tokens == 0) {
             LOG_VERBOSE("no tokens to decode", {});
-
-            return true;
+            return;
         }
 
         LOG_VERBOSE("decoding batch", {
@@ -2033,7 +2051,13 @@ struct server_context {
                 if (n_batch == 1 || ret < 0) {
                     // if you get here, it means the KV cache is full - try increasing it via the context size
                     LOG_TEE("%s : failed to decode the batch, n_batch = %d, ret = %d\n", __func__, n_batch, ret);
-                    return false;
+                    for (auto & slot : slots) {
+                        slot.state = SLOT_STATE_PROCESSING;
+                        slot.command = SLOT_COMMAND_NONE;
+                        slot.release();
+                        send_error(slot, "Input prompt is too big compared to KV size. Please try increasing KV size.");
+                    }
+                    break; // break loop of n_batch
                 }
 
                 LOG_TEE("%s : failed to find free space in the KV cache, retrying with smaller n_batch = %d\n", __func__, n_batch / 2);
@@ -2042,12 +2066,12 @@ struct server_context {
                 n_batch /= 2;
                 i -= n_batch;
 
-                continue;
+                continue; // continue loop of n_batch
             }
 
             for (auto & slot : slots) {
                 if (slot.state != SLOT_STATE_PROCESSING || slot.i_batch < (int) i || slot.i_batch >= (int) (i + n_tokens)) {
-                    continue;
+                    continue; // continue loop of slots
                 }
 
                 // prompt evaluated for embedding
@@ -2055,7 +2079,7 @@ struct server_context {
                     send_embedding(slot, batch_view);
                     slot.release();
                     slot.i_batch = -1;
-                    continue;
+                    continue; // continue loop of slots
                 }
 
                 completion_token_output result;
@@ -2097,9 +2121,7 @@ struct server_context {
             }
         }
 
-        LOG_VERBOSE("slots updated", {});
-
-        return true;
+        LOG_VERBOSE("run slots completed", {});
     }
 
     json model_meta() const {
@@ -2745,32 +2767,32 @@ int main(int argc, char ** argv) {
 
     svr->set_logger(log_server_request);
 
-    svr->set_exception_handler([](const httplib::Request &, httplib::Response & res, std::exception_ptr ep) {
-        const char fmt[] = "500 Internal Server Error\n%s";
+    auto res_error = [](httplib::Response & res, json error_data) {
+        json final_response {{"error", error_data}};
+        res.set_content(final_response.dump(), "application/json; charset=utf-8");
+        res.status = json_value(error_data, "code", 500);
+    };
 
-        char buf[BUFSIZ];
+    svr->set_exception_handler([&res_error](const httplib::Request &, httplib::Response & res, std::exception_ptr ep) {
+        std::string message;
         try {
             std::rethrow_exception(std::move(ep));
-        } catch (std::exception &e) {
-            snprintf(buf, sizeof(buf), fmt, e.what());
+        } catch (std::exception & e) {
+            message = e.what();
         } catch (...) {
-            snprintf(buf, sizeof(buf), fmt, "Unknown Exception");
+            message = "Unknown Exception";
         }
 
-        res.set_content(buf, "text/plain; charset=utf-8");
-        res.status = 500;
+        json formatted_error = format_error_response(message, ERROR_TYPE_SERVER);
+        LOG_VERBOSE("Got exception", formatted_error);
+        res_error(res, formatted_error);
     });
 
-    svr->set_error_handler([](const httplib::Request &, httplib::Response & res) {
-        if (res.status == 401) {
-            res.set_content("Unauthorized", "text/plain; charset=utf-8");
-        }
-        if (res.status == 400) {
-            res.set_content("Invalid request", "text/plain; charset=utf-8");
-        }
+    svr->set_error_handler([&res_error](const httplib::Request &, httplib::Response & res) {
         if (res.status == 404) {
-            res.set_content("File Not Found", "text/plain; charset=utf-8");
+            res_error(res, format_error_response("File Not Found", ERROR_TYPE_NOT_FOUND));
         }
+        // for other error codes, we skip processing here because it's already done by res_error()
     });
 
     // set timeouts and change hostname and port
@@ -2835,7 +2857,7 @@ int main(int argc, char ** argv) {
     // Middlewares
     //
 
-    auto middleware_validate_api_key = [&sparams](const httplib::Request & req, httplib::Response & res) {
+    auto middleware_validate_api_key = [&sparams, &res_error](const httplib::Request & req, httplib::Response & res) {
         // TODO: should we apply API key to all endpoints, including "/health" and "/models"?
         static const std::set<std::string> protected_endpoints = {
             "/props",
@@ -2876,8 +2898,7 @@ int main(int argc, char ** argv) {
         // API key is invalid or not provided
         // TODO: make another middleware for CORS related logic
         res.set_header("Access-Control-Allow-Origin", req.get_header_value("Origin"));
-        res.set_content("Unauthorized: Invalid API Key", "text/plain; charset=utf-8");
-        res.status = 401; // Unauthorized
+        res_error(res, format_error_response("Invalid API Key", ERROR_TYPE_AUTHENTICATION));
 
         LOG_WARNING("Unauthorized: Invalid API Key", {});
 
@@ -2940,21 +2961,18 @@ int main(int argc, char ** argv) {
                 }
             case SERVER_STATE_LOADING_MODEL:
                 {
-                    res.set_content(R"({"status": "loading model"})", "application/json");
-                    res.status = 503; // HTTP Service Unavailable
+                    res_error(res, format_error_response("Loading model", ERROR_TYPE_UNAVAILABLE));
                 } break;
             case SERVER_STATE_ERROR:
                 {
-                    res.set_content(R"({"status": "error", "error": "Model failed to load"})", "application/json");
-                    res.status = 500; // HTTP Internal Server Error
+                    res_error(res, format_error_response("Model failed to load", ERROR_TYPE_SERVER));
                 } break;
         }
     };
 
     const auto handle_slots = [&](const httplib::Request &, httplib::Response & res) {
         if (!sparams.slots_endpoint) {
-            res.status = 501;
-            res.set_content("This server does not support slots endpoint.", "text/plain; charset=utf-8");
+            res_error(res, format_error_response("This server does not support slots endpoint.", ERROR_TYPE_NOT_SUPPORTED));
             return;
         }
 
@@ -2978,8 +2996,7 @@ int main(int argc, char ** argv) {
 
     const auto handle_metrics = [&](const httplib::Request &, httplib::Response & res) {
         if (!sparams.metrics_endpoint) {
-            res.status = 501;
-            res.set_content("This server does not support metrics endpoint.", "text/plain; charset=utf-8");
+            res_error(res, format_error_response("This server does not support metrics endpoint.", ERROR_TYPE_NOT_SUPPORTED));
             return;
         }
 
@@ -3090,7 +3107,7 @@ int main(int argc, char ** argv) {
         res.set_content(data.dump(), "application/json; charset=utf-8");
     };
 
-    const auto handle_completions = [&ctx_server](const httplib::Request & req, httplib::Response & res) {
+    const auto handle_completions = [&ctx_server, &res_error](const httplib::Request & req, httplib::Response & res) {
         res.set_header("Access-Control-Allow-Origin", req.get_header_value("Origin"));
 
         json data = json::parse(req.body);
@@ -3105,8 +3122,7 @@ int main(int argc, char ** argv) {
             if (!result.error && result.stop) {
                 res.set_content(result.data.dump(-1, ' ', false, json::error_handler_t::replace), "application/json; charset=utf-8");
             } else {
-                res.status = 500;
-                res.set_content(result.data["content"], "text/plain; charset=utf-8");
+                res_error(res, result.data);
             }
 
             ctx_server.queue_results.remove_waiting_task_id(id_task);
@@ -3186,7 +3202,7 @@ int main(int argc, char ** argv) {
         res.set_content(models.dump(), "application/json; charset=utf-8");
     };
 
-    const auto handle_chat_completions = [&ctx_server, &sparams](const httplib::Request & req, httplib::Response & res) {
+    const auto handle_chat_completions = [&ctx_server, &sparams, &res_error](const httplib::Request & req, httplib::Response & res) {
         res.set_header("Access-Control-Allow-Origin", req.get_header_value("Origin"));
         json data = oaicompat_completion_params_parse(ctx_server.model, json::parse(req.body), sparams.chat_template);
 
@@ -3204,8 +3220,7 @@ int main(int argc, char ** argv) {
 
                 res.set_content(result_oai.dump(-1, ' ', false, json::error_handler_t::replace), "application/json; charset=utf-8");
             } else {
-                res.status = 500;
-                res.set_content(result.data["content"], "text/plain; charset=utf-8");
+                res_error(res, result.data);
             }
             ctx_server.queue_results.remove_waiting_task_id(id_task);
         } else {
@@ -3259,7 +3274,7 @@ int main(int argc, char ** argv) {
         }
     };
 
-    const auto handle_infill = [&ctx_server](const httplib::Request & req, httplib::Response & res) {
+    const auto handle_infill = [&ctx_server, &res_error](const httplib::Request & req, httplib::Response & res) {
         res.set_header("Access-Control-Allow-Origin", req.get_header_value("Origin"));
 
         json data = json::parse(req.body);
@@ -3274,8 +3289,7 @@ int main(int argc, char ** argv) {
             if (!result.error && result.stop) {
                 res.set_content(result.data.dump(-1, ' ', false, json::error_handler_t::replace), "application/json; charset=utf-8");
             } else {
-                res.status = 404;
-                res.set_content(result.data["content"], "text/plain; charset=utf-8");
+                res_error(res, result.data);
             }
 
             ctx_server.queue_results.remove_waiting_task_id(id_task);
@@ -3346,7 +3360,7 @@ int main(int argc, char ** argv) {
         return res.set_content(data.dump(), "application/json; charset=utf-8");
     };
 
-    const auto handle_embeddings = [&params, &ctx_server](const httplib::Request & req, httplib::Response & res) {
+    const auto handle_embeddings = [&params, &ctx_server, &res_error](const httplib::Request & req, httplib::Response & res) {
         res.set_header("Access-Control-Allow-Origin", req.get_header_value("Origin"));
         if (!params.embedding) {
             res.status = 501;
@@ -3375,8 +3389,8 @@ int main(int argc, char ** argv) {
             std::string content = body["content"];
             prompts.push_back(content);
         } else {
-            // TODO @ngxson : should return an error here
-            prompts.push_back("");
+            res_error(res, format_error_response("\"input\" or \"content\" must be provided", ERROR_TYPE_INVALID_REQUEST));
+            return;
         }
 
         // process all prompts
@@ -3392,9 +3406,14 @@ int main(int argc, char ** argv) {
             // get the result
             server_task_result result = ctx_server.queue_results.recv(id_task);
             ctx_server.queue_results.remove_waiting_task_id(id_task);
-
-            // append to the responses
-            responses.push_back(result.data);
+            if (!result.error) {
+                // append to the responses
+                responses.push_back(result.data);
+            } else {
+                // error received, ignore everything else
+                res_error(res, result.data);
+                return;
+            }
         }
 
         // write JSON response
@@ -3488,7 +3507,7 @@ int main(int argc, char ** argv) {
         &server_context::process_single_task, &ctx_server, std::placeholders::_1));
     ctx_server.queue_tasks.on_finish_multitask(std::bind(
         &server_context::on_finish_multitask, &ctx_server, std::placeholders::_1));
-    ctx_server.queue_tasks.on_run_slots(std::bind(
+    ctx_server.queue_tasks.on_update_slots(std::bind(
         &server_context::update_slots, &ctx_server));
     ctx_server.queue_results.on_multitask_update(std::bind(
         &server_queue::update_multitask,
diff --git a/examples/server/tests/features/steps/steps.py b/examples/server/tests/features/steps/steps.py
index 4e81a255a..98c2b6174 100644
--- a/examples/server/tests/features/steps/steps.py
+++ b/examples/server/tests/features/steps/steps.py
@@ -801,7 +801,7 @@ async def oai_chat_completions(user_prompt,
                 stream=enable_streaming,
                 seed=seed
             )
-        except openai.error.APIError as e:
+        except openai.error.AuthenticationError as e:
             if expect_api_error is not None and expect_api_error:
                 return 401
             else:
diff --git a/examples/server/utils.hpp b/examples/server/utils.hpp
index f27af81e9..48aeef4eb 100644
--- a/examples/server/utils.hpp
+++ b/examples/server/utils.hpp
@@ -14,6 +14,17 @@
 
 using json = nlohmann::json;
 
+// https://community.openai.com/t/openai-chat-list-of-error-codes-and-types/357791/11
+enum error_type {
+    ERROR_TYPE_INVALID_REQUEST,
+    ERROR_TYPE_AUTHENTICATION,
+    ERROR_TYPE_SERVER,
+    ERROR_TYPE_NOT_FOUND,
+    ERROR_TYPE_PERMISSION,
+    ERROR_TYPE_UNAVAILABLE, // custom error
+    ERROR_TYPE_NOT_SUPPORTED, // custom error
+};
+
 extern bool server_verbose;
 extern bool server_log_json;
 
@@ -542,3 +553,43 @@ static json format_detokenized_response(const std::string & content) {
         {"content", content}
     };
 }
+
+static json format_error_response(const std::string & message, const enum error_type type) {
+    std::string type_str;
+    int code = 500;
+    switch (type) {
+        case ERROR_TYPE_INVALID_REQUEST:
+            type_str = "invalid_request_error";
+            code = 400;
+            break;
+        case ERROR_TYPE_AUTHENTICATION:
+            type_str = "authentication_error";
+            code = 401;
+            break;
+        case ERROR_TYPE_NOT_FOUND:
+            type_str = "not_found_error";
+            code = 404;
+            break;
+        case ERROR_TYPE_SERVER:
+            type_str = "server_error";
+            code = 500;
+            break;
+        case ERROR_TYPE_PERMISSION:
+            type_str = "permission_error";
+            code = 403;
+            break;
+        case ERROR_TYPE_NOT_SUPPORTED:
+            type_str = "not_supported_error";
+            code = 501;
+            break;
+        case ERROR_TYPE_UNAVAILABLE:
+            type_str = "unavailable_error";
+            code = 503;
+            break;
+    }
+    return json {
+        {"code", code},
+        {"message", message},
+        {"type", type_str},
+    };
+}