diff --git a/common/include/request.h b/common/include/request.h
index 8442ab5..e94e624 100644
--- a/common/include/request.h
+++ b/common/include/request.h
@@ -40,6 +40,7 @@ struct response_body_get_world_data_t {
 
 
 struct response_t {
+    enum request_type_t type;
     bool success;
     void *body;
         // The body's type depends on the request's type
diff --git a/common/include/world.h b/common/include/world.h
index 9eb4822..fb313cd 100644
--- a/common/include/world.h
+++ b/common/include/world.h
@@ -22,11 +22,14 @@ struct world_t {
 enum error_t world_init(struct world_t *, size_t, size_t);
 void world_free(struct world_t *);
 
-enum error_t world_serialise_str(struct world_t *, char const **);
+enum error_t world_serialise(struct world_t const *, struct json_t **);
+enum error_t world_deserialise(struct world_t *, struct json_t *);
+
+enum error_t world_serialise_str(struct world_t const *, char const **);
 enum error_t world_deserialise_str(struct world_t *, char const *);
     // Operates on strings; serialise allocates so make sure to free
 
-enum error_t world_serialise_buf(struct world_t *, char *, size_t);
+enum error_t world_serialise_buf(struct world_t const *, char *, size_t);
     // Operates on buffers; need not be zero-terminated
 
 enum error_t world_register_entity(struct world_t *, char const *, char);
diff --git a/common/src/request.c b/common/src/request.c
index c615d90..5e6af9e 100644
--- a/common/src/request.c
+++ b/common/src/request.c
@@ -11,6 +11,9 @@ static char const *REQUEST_JSON_FMT = "{si, so}";
 static char const *REQUEST_BODY_GET_WORLD_DATA_JSON_FMT = "{sI}";
 
 // Response Format Strings
+static char const *RESPONSE_JSON_FMT = "{sb, si, so}";
+
+static char const *RESPONSE_BODY_GET_WORLD_DATA_JSON_FMT = "{so}";
 
 
 static enum error_t request_serialise_body_get_world_data(
@@ -44,6 +47,7 @@ static enum error_t request_serialise_body(
 
         default: return ERR_JSON_SERIALISE;
     }
+
     return ERR_OK;
 }
 
@@ -135,7 +139,7 @@ enum error_t request_serialise_buf(
     }
 
     json_decref(json);
-    return ERR_OK;
+return ERR_OK;
 }
 
 
@@ -237,16 +241,233 @@ enum error_t request_deserialise_str(struct request_t *self, char const *str) {
 }
 
 
+static enum error_t response_serialise_body_get_world_data(
+    struct response_body_get_world_data_t const *self,
+    struct json_t **jsonptr
+) {
+    assert(self != NULL);
+    assert(jsonptr != NULL);
+
+    struct json_t *json = NULL;
+    enum error_t err = world_serialise(&self->world, &json);
+    if (err != ERR_OK) return err;
+
+    *jsonptr = json;
+    return ERR_OK;
+}
+
+
+static enum error_t response_serialise_body(
+    struct response_t const *self,
+    struct json_t **jsonptr
+) {
+    assert(self != NULL);
+    assert(jsonptr != NULL);
+
+    switch (self->type) {
+        case REQUEST_GET_WORLD_DATA:
+            return response_serialise_body_get_world_data(self->body, jsonptr);
+
+        default: return ERR_JSON_SERIALISE;
+    }
+
+    return ERR_OK;
+}
+
+
+static enum error_t response_serialise_parts(
+    struct json_t *body_json, enum request_type_t request_type, bool success,
+    struct json_t **jsonptr
+) {
+    assert(body_json != NULL);
+    assert(jsonptr != NULL);
+
+    struct json_t *json = json_pack(RESPONSE_JSON_FMT,
+        "success", success,
+        "request-code", request_type,
+        "response", body_json
+    );
+
+    if (json == NULL) return ERR_JSON_SERIALISE;
+
+    *jsonptr = json;
+    return ERR_OK;
+}
+
+
+static enum error_t response_serialise(
+    struct response_t const *self,
+    struct json_t **jsonptr
+) {
+    assert(self != NULL);
+    assert(jsonptr != NULL);
+
+    // Serialise response body
+    struct json_t *body_json = NULL;
+    enum error_t err = response_serialise_body(self, &body_json);
+    if (err != ERR_OK) return err;
+
+    // Serialise full structure
+    struct json_t *response_json = NULL;
+    err = response_serialise_parts(
+        body_json, self->success, self->type,
+        &response_json
+    );
+
+    if (err != ERR_OK) {
+        json_decref(body_json);
+        return err;
+    }
+
+    *jsonptr = response_json;
+    return ERR_OK;
+}
+
+
 enum error_t response_serialise_str(
     struct response_t const *self,
     char const **strptr
-);
+) {
+    assert(self != NULL);
+    assert(strptr != NULL);
+
+    struct json_t *json = NULL;
+    enum error_t err = response_serialise(self, &json);
+    if (err != ERR_OK) return err;
+
+    const char *str = json_dumps(json, 0);
+    if (str == NULL) {
+        json_decref(json);
+        return ERR_JSON_SERIALISE;
+    }
+
+    json_decref(json);
+
+    *strptr = str;
+    return ERR_OK;
+}
 
 
 enum error_t response_serialise_buf(
     struct response_t const *self,
     char *buf, size_t len
-);
+) {
+    assert(self != NULL);
+    assert(buf != NULL);
+    assert(len > 0);
+
+    struct json_t *json = NULL;
+    enum error_t err = response_serialise(self, &json);
+    if (err != ERR_OK) return err;
+
+    size_t bytes_written = json_dumpb(json, buf, len, 0);
+    if (bytes_written == 0) {
+        json_decref(json);
+        return ERR_JSON_SERIALISE;
+    }
+
+    json_decref(json);
+    return ERR_OK;
+}
 
 
-enum error_t response_deserialise_str(struct response_t *self, char const *str);
+static enum error_t response_deserialise_parts(
+    struct json_t **body_json,
+    enum request_type_t *type,
+    bool *success,
+    struct json_t *json
+) {
+    assert(body_json != NULL);
+    assert(type != NULL);
+    assert(success != NULL);
+    assert(json != NULL);
+
+    int err = json_unpack(json, RESPONSE_JSON_FMT,
+        "success", success,
+        "request-code", type,
+        "response", body_json
+    );
+
+    if (err < 0) return ERR_JSON_DESERIALISE;
+    return ERR_OK;
+}
+
+
+static enum error_t response_deserialise_body_get_world_data(
+    struct response_body_get_world_data_t *self,
+    struct json_t *json
+) {
+    assert(self != NULL);
+    assert(json != NULL);
+
+    enum error_t err = world_deserialise(&self->world, json);
+    if (err != ERR_OK) return err;
+
+    return ERR_OK;
+}
+
+
+static enum error_t response_deserialise_body(
+    struct response_t *self,
+    struct json_t *json
+) {
+    assert(self != NULL);
+    assert(json != NULL);
+
+    switch (self->type) {
+        case REQUEST_GET_WORLD_DATA:
+            self->body = malloc(sizeof(struct response_body_get_world_data_t));
+            if (self->body == NULL) return ERR_ALLOC;
+
+            return response_deserialise_body_get_world_data(self->body, json);
+
+        default: return ERR_JSON_SERIALISE;
+    }
+}
+
+
+static enum error_t response_deserialise(
+    struct response_t *self,
+    struct json_t *json
+) {
+    assert(self != NULL);
+    assert(json != NULL);
+
+    struct response_t temp_response = { 0 };
+    struct json_t *body_json = NULL;
+
+    enum error_t err = response_deserialise_parts(
+        &body_json, &temp_response.type, &temp_response.success, json
+    );
+    if (err != ERR_OK) return err;
+
+    err = response_deserialise_body(&temp_response, body_json);
+    if (err != ERR_OK) {
+        json_decref(body_json);
+        return err;
+    }
+
+    *self = temp_response;
+    return ERR_OK;
+}
+
+
+enum error_t response_deserialise_str(
+    struct response_t *self,
+    char const *str
+) {
+    assert(self != NULL);
+    assert(str != NULL);
+
+    struct json_t *json = json_loads(str, 0, NULL);
+    if (json == NULL) return ERR_JSON_DESERIALISE;
+
+    enum error_t err = response_deserialise(self, json);
+    if (err != ERR_OK) {
+        json_decref(json);
+        return err;
+    }
+
+    json_decref(json);
+    return ERR_OK;
+}
diff --git a/common/src/world.c b/common/src/world.c
index f53e741..03b6262 100644
--- a/common/src/world.c
+++ b/common/src/world.c
@@ -104,7 +104,10 @@ static enum error_t world_serialise_parts(
 }
 
 
-static enum error_t world_serialise(struct world_t *self, struct json_t **json) {
+enum error_t world_serialise(
+    struct world_t const *self,
+    struct json_t **json
+) {
     assert(self != NULL);
     assert(json != NULL);
 
@@ -212,7 +215,7 @@ static enum error_t world_deserialise_entities(
 }
 
 
-static enum error_t world_deserialise(struct world_t *self, struct json_t *json) {
+enum error_t world_deserialise(struct world_t *self, struct json_t *json) {
     assert(self != NULL);
     assert(json != NULL);
 
@@ -256,7 +259,10 @@ error:
 }
 
 
-enum error_t world_serialise_str(struct world_t *self, char const **strptr) {
+enum error_t world_serialise_str(
+    struct world_t const *self,
+    char const **strptr
+) {
     assert(self != NULL);
     assert(strptr != NULL);
 
@@ -277,7 +283,10 @@ enum error_t world_serialise_str(struct world_t *self, char const **strptr) {
 }
 
 
-enum error_t world_serialise_buf(struct world_t *self, char *buf, size_t len) {
+enum error_t world_serialise_buf(
+    struct world_t const *self,
+    char *buf, size_t len
+) {
     assert(self != NULL);
     assert(buf != NULL);
     assert(len > 0);
diff --git a/server/src/main.c b/server/src/main.c
index 4afabff..3f0d3f9 100644
--- a/server/src/main.c
+++ b/server/src/main.c
@@ -27,25 +27,30 @@ enum error_t game_loop(struct data_t *data) {
     enum error_t err = ERR_OK;
 
     // TEMP
-    struct request_body_get_world_data_t request_body = { 69 };
-    struct request_t request = { REQUEST_GET_WORLD_DATA, &request_body };
+    struct response_body_get_world_data_t response_body = { data->world };
+    struct response_t response = { true, REQUEST_GET_WORLD_DATA, &response_body };
 
-    char const *request_json_str = NULL;
-    err = request_serialise_str(&request, &request_json_str);
+    char const *response_json_str = NULL;
+    err = response_serialise_str(&response, &response_json_str);
     if (err) return err;
 
-    printf("serialised request: %s\n", request_json_str);
+    printf("serialised response: %s\n", response_json_str);
 
-    struct request_t request2 = { 0 };
-    err = request_deserialise_str(&request2, request_json_str);
+    struct response_t response2 = { 0 };
+    err = response_deserialise_str(&response2, response_json_str);
     if (err) return err;
 
-    struct request_body_get_world_data_t *request2_body = request2.body;
-    printf("deserialised request: (%d, %zu)\n",
-        request2.type,
-        request2_body->world_id
+    struct response_body_get_world_data_t *response2_body = response2.body;
+
+    char const *world_json_str = NULL;
+    err = world_serialise_str(&response2_body->world, &world_json_str);
+    if (err) return err;
+    printf("deserialised response: (%d, %d, %s\n",
+        response2.success,
+        response2.type,
+        world_json_str
     );
-    free((void *)request_json_str);
+    free((void *)response_json_str);
 
     // TEMP