diff --git a/handlers/category.go b/handlers/category.go
new file mode 100644
index 0000000..181ba86
--- /dev/null
+++ b/handlers/category.go
@@ -0,0 +1,263 @@
+package handlers
+
+import (
+	"fmt"
+	"strconv"
+
+	"git.qowevisa.me/Qowevisa/gonuts/db"
+	"git.qowevisa.me/Qowevisa/gonuts/types"
+	"git.qowevisa.me/Qowevisa/gonuts/utils"
+	"github.com/gin-gonic/gin"
+)
+
+// @Summary Get category by id
+// @Description Get category by id
+// @Tags category
+// @Accept json
+// @Produce json
+// @Param Authorization header string true "Bearer token"
+// @Param category path int true "id"
+// @Success 200 {object} types.DbCategory
+// @Failure 400 {object} types.ErrorResponse
+// @Failure 401 {object} types.ErrorResponse
+// @Failure 500 {object} types.ErrorResponse
+// @Security ApiKeyAuth
+// @Router /category/:id [get]
+func CategoryGetId(c *gin.Context) {
+	userIDAny, exists := c.Get("UserID")
+	if !exists {
+		c.JSON(500, types.ErrorResponse{Message: "Internal error 001"})
+		return
+	}
+
+	var userID uint
+	if userIDVal, ok := userIDAny.(uint); !ok {
+		c.JSON(500, types.ErrorResponse{Message: "Internal error 002"})
+		return
+	} else {
+		userID = userIDVal
+	}
+
+	idStr := c.Param("id")
+	var id uint
+	if idVal, err := strconv.ParseUint(idStr, 10, 32); err != nil {
+		c.JSON(400, types.ErrorResponse{Message: "Invalid request"})
+		return
+	} else {
+		id = uint(idVal)
+	}
+
+	var dbCategory db.Category
+	dbc := db.Connect()
+	if err := dbc.Find(&dbCategory, id).Error; err != nil {
+		c.JSON(500, types.ErrorResponse{Message: err.Error()})
+		return
+	}
+	if dbCategory.ID == 0 {
+		c.JSON(500, types.ErrorResponse{Message: "DAFUQ003"})
+		return
+	}
+	if dbCategory.UserID != userID {
+		c.JSON(401, types.ErrorResponse{Message: "This category.id is not yours, you sneaky."})
+		return
+	}
+
+	category := types.DbCategory{
+		Name:     dbCategory.Name,
+		ParentID: dbCategory.ParentID,
+		UserID:   userID,
+	}
+	c.JSON(200, category)
+}
+
+// @Summary Get category by id
+// @Description Get category by id
+// @Tags category
+// @Accept json
+// @Produce json
+// @Param Authorization header string true "Bearer token"
+// @Param category body types.DbCategory true "Category"
+// @Success 200 {object} types.Message
+// @Failure 400 {object} types.ErrorResponse
+// @Failure 500 {object} types.ErrorResponse
+// @Security ApiKeyAuth
+// @Router /category/add [post]
+func CategoryAdd(c *gin.Context) {
+	userIDAny, exists := c.Get("UserID")
+	if !exists {
+		c.JSON(500, types.ErrorResponse{Message: "Internal error 001"})
+		return
+	}
+
+	var userID uint
+	if userIDVal, ok := userIDAny.(uint); !ok {
+		c.JSON(500, types.ErrorResponse{Message: "Internal error 002"})
+		return
+	} else {
+		userID = userIDVal
+	}
+
+	var category types.DbCategory
+	if err := c.ShouldBindJSON(&category); err != nil {
+		c.JSON(400, types.ErrorResponse{Message: "Invalid request"})
+		return
+	}
+
+	dbCategory := &db.Category{
+		Name:     category.Name,
+		ParentID: category.ParentID,
+		UserID:   userID,
+	}
+	dbc := db.Connect()
+	if err := dbc.Create(&dbCategory).Error; err != nil {
+		c.JSON(500, types.ErrorResponse{Message: err.Error()})
+		return
+	}
+	if dbCategory.ID == 0 {
+		c.JSON(500, types.ErrorResponse{Message: "DAFUQ004"})
+		return
+	}
+	msg := types.Message{
+		Message: fmt.Sprintf("Category with id %d was successfully created!", dbCategory.ID),
+	}
+	c.JSON(200, msg)
+}
+
+// @Summary Edit category by id
+// @Description Edit category by id
+// @Tags category
+// @Accept json
+// @Produce json
+// @Param Authorization header string true "Bearer token"
+// @Param categoryID path int true "id"
+// @Param category body types.DbCategory true "Category"
+// @Success 200 {object} types.DbCategory
+// @Failure 400 {object} types.ErrorResponse
+// @Failure 401 {object} types.ErrorResponse
+// @Failure 500 {object} types.ErrorResponse
+// @Security ApiKeyAuth
+// @Router /category/edit/:id [put]
+func CategoryPutId(c *gin.Context) {
+	userIDAny, exists := c.Get("UserID")
+	if !exists {
+		c.JSON(500, types.ErrorResponse{Message: "Internal error 001"})
+		return
+	}
+
+	var userID uint
+	if userIDVal, ok := userIDAny.(uint); !ok {
+		c.JSON(500, types.ErrorResponse{Message: "Internal error 002"})
+		return
+	} else {
+		userID = userIDVal
+	}
+
+	idStr := c.Param("id")
+	var id uint
+	if idVal, err := strconv.ParseUint(idStr, 10, 32); err != nil {
+		c.JSON(400, types.ErrorResponse{Message: "Invalid request"})
+		return
+	} else {
+		id = uint(idVal)
+	}
+
+	var dbCategory db.Category
+	dbc := db.Connect()
+	if err := dbc.Find(&dbCategory, id).Error; err != nil {
+		c.JSON(500, types.ErrorResponse{Message: err.Error()})
+		return
+	}
+	if dbCategory.ID == 0 {
+		c.JSON(500, types.ErrorResponse{Message: "DAFUQ003"})
+		return
+	}
+	if dbCategory.UserID != userID {
+		c.JSON(401, types.ErrorResponse{Message: "This category.id is not yours, you sneaky."})
+		return
+	}
+	var category types.DbCategory
+	if err := c.ShouldBindJSON(&category); err != nil {
+		c.JSON(400, types.ErrorResponse{Message: "Invalid request"})
+		return
+	}
+
+	utils.MergeNonZeroFields(category, dbCategory)
+
+	if err := dbc.Save(dbCategory).Error; err != nil {
+		c.JSON(500, types.ErrorResponse{Message: err.Error()})
+		return
+	}
+
+	ret := types.DbCategory{
+		ID:       dbCategory.ID,
+		Name:     dbCategory.Name,
+		ParentID: dbCategory.ParentID,
+		UserID:   dbCategory.UserID,
+	}
+	c.JSON(200, ret)
+}
+
+// @Summary Delete category by id
+// @Description Delete category by id
+// @Tags category
+// @Accept json
+// @Produce json
+// @Param Authorization header string true "Bearer token"
+// @Param categoryID path int true "id"
+// @Success 200 {object} types.DbCategory
+// @Failure 400 {object} types.ErrorResponse
+// @Failure 401 {object} types.ErrorResponse
+// @Failure 500 {object} types.ErrorResponse
+// @Security ApiKeyAuth
+// @Router /category/delete/:id [delete]
+func CategoryDeleteId(c *gin.Context) {
+	userIDAny, exists := c.Get("UserID")
+	if !exists {
+		c.JSON(500, types.ErrorResponse{Message: "Internal error 001"})
+		return
+	}
+
+	var userID uint
+	if userIDVal, ok := userIDAny.(uint); !ok {
+		c.JSON(500, types.ErrorResponse{Message: "Internal error 002"})
+		return
+	} else {
+		userID = userIDVal
+	}
+
+	idStr := c.Param("id")
+	var id uint
+	if idVal, err := strconv.ParseUint(idStr, 10, 32); err != nil {
+		c.JSON(400, types.ErrorResponse{Message: "Invalid request"})
+		return
+	} else {
+		id = uint(idVal)
+	}
+
+	var dbCategory db.Category
+	dbc := db.Connect()
+	if err := dbc.Find(&dbCategory, id).Error; err != nil {
+		c.JSON(500, types.ErrorResponse{Message: err.Error()})
+		return
+	}
+	if dbCategory.ID == 0 {
+		c.JSON(500, types.ErrorResponse{Message: "DAFUQ003"})
+		return
+	}
+	if dbCategory.UserID != userID {
+		c.JSON(401, types.ErrorResponse{Message: "This category.id is not yours, you sneaky."})
+		return
+	}
+	if err := dbc.Delete(dbCategory).Error; err != nil {
+		c.JSON(500, types.ErrorResponse{Message: err.Error()})
+		return
+	}
+
+	ret := types.DbCategory{
+		ID:       dbCategory.ID,
+		Name:     dbCategory.Name,
+		ParentID: dbCategory.ParentID,
+		UserID:   dbCategory.UserID,
+	}
+	c.JSON(200, ret)
+}