diff --git a/pkg/common/sql_helpers.go b/pkg/common/sql_helpers.go
index 3093d49..82b1ae8 100644
--- a/pkg/common/sql_helpers.go
+++ b/pkg/common/sql_helpers.go
@@ -2,6 +2,7 @@ package common
 
 import (
 	"fmt"
+	"reflect"
 	"regexp"
 	"strings"
 
@@ -925,3 +926,36 @@ func extractLeftSideOfComparison(cond string) string {
 
 	return ""
 }
+
+// FilterValueToSlice converts a filter value to []interface{} for use with IN operators.
+// JSON-decoded arrays arrive as []interface{}, but typed slices (e.g. []string) also work.
+// Returns a single-element slice if the value is not a slice type.
+func FilterValueToSlice(v interface{}) []interface{} {
+	if v == nil {
+		return nil
+	}
+	rv := reflect.ValueOf(v)
+	if rv.Kind() == reflect.Slice {
+		result := make([]interface{}, rv.Len())
+		for i := 0; i < rv.Len(); i++ {
+			result[i] = rv.Index(i).Interface()
+		}
+		return result
+	}
+	return []interface{}{v}
+}
+
+// BuildInCondition builds a parameterized IN condition from a filter value.
+// Returns the condition string (e.g. "col IN (?,?)") and the individual values as args.
+// Returns ("", nil) if the value is empty or not a slice.
+func BuildInCondition(column string, v interface{}) (query string, args []interface{}) {
+	values := FilterValueToSlice(v)
+	if len(values) == 0 {
+		return "", nil
+	}
+	placeholders := make([]string, len(values))
+	for i := range values {
+		placeholders[i] = "?"
+	}
+	return fmt.Sprintf("%s IN (%s)", column, strings.Join(placeholders, ",")), values
+}
diff --git a/pkg/resolvespec/filter_test.go b/pkg/resolvespec/filter_test.go
index 177997f..87e116f 100644
--- a/pkg/resolvespec/filter_test.go
+++ b/pkg/resolvespec/filter_test.go
@@ -44,8 +44,8 @@ func TestBuildFilterCondition(t *testing.T) {
 				Operator: "in",
 				Value:    []string{"active", "pending"},
 			},
-			expectedCondition: "status IN (?)",
-			expectedArgsCount: 1,
+			expectedCondition: "status IN (?,?)",
+			expectedArgsCount: 2,
 		},
 		{
 			name: "LIKE operator",
diff --git a/pkg/resolvespec/handler.go b/pkg/resolvespec/handler.go
index fcf2227..dc87539 100644
--- a/pkg/resolvespec/handler.go
+++ b/pkg/resolvespec/handler.go
@@ -1546,8 +1546,10 @@ func (h *Handler) buildFilterCondition(filter common.FilterOption) (conditionStr
 		condition = fmt.Sprintf("%s ILIKE ?", filter.Column)
 		args = []interface{}{filter.Value}
 	case "in":
-		condition = fmt.Sprintf("%s IN (?)", filter.Column)
-		args = []interface{}{filter.Value}
+		condition, args = common.BuildInCondition(filter.Column, filter.Value)
+		if condition == "" {
+			return "", nil
+		}
 	default:
 		return "", nil
 	}
@@ -1588,8 +1590,10 @@ func (h *Handler) applyFilter(query common.SelectQuery, filter common.FilterOpti
 		condition = fmt.Sprintf("%s ILIKE ?", filter.Column)
 		args = []interface{}{filter.Value}
 	case "in":
-		condition = fmt.Sprintf("%s IN (?)", filter.Column)
-		args = []interface{}{filter.Value}
+		condition, args = common.BuildInCondition(filter.Column, filter.Value)
+		if condition == "" {
+			return query
+		}
 	default:
 		return query
 	}
diff --git a/pkg/restheadspec/handler.go b/pkg/restheadspec/handler.go
index cc84ce3..bfbbe67 100644
--- a/pkg/restheadspec/handler.go
+++ b/pkg/restheadspec/handler.go
@@ -2146,7 +2146,11 @@ func (h *Handler) applyFilter(query common.SelectQuery, filter common.FilterOpti
 		// Column is already cast to TEXT if needed
 		return applyWhere(fmt.Sprintf("%s ILIKE ?", qualifiedColumn), filter.Value)
 	case "in":
-		return applyWhere(fmt.Sprintf("%s IN (?)", qualifiedColumn), filter.Value)
+		cond, inArgs := common.BuildInCondition(qualifiedColumn, filter.Value)
+		if cond == "" {
+			return query
+		}
+		return applyWhere(cond, inArgs...)
 	case "between":
 		// Handle between operator - exclusive (> val1 AND < val2)
 		if values, ok := filter.Value.([]interface{}); ok && len(values) == 2 {
@@ -2239,7 +2243,8 @@ func (h *Handler) buildFilterCondition(qualifiedColumn string, filter *common.Fi
 	case "ilike":
 		return fmt.Sprintf("%s ILIKE ?", qualifiedColumn), []interface{}{filter.Value}
 	case "in":
-		return fmt.Sprintf("%s IN (?)", qualifiedColumn), []interface{}{filter.Value}
+		cond, inArgs := common.BuildInCondition(qualifiedColumn, filter.Value)
+		return cond, inArgs
 	case "between":
 		// Handle between operator - exclusive (> val1 AND < val2)
 		if values, ok := filter.Value.([]interface{}); ok && len(values) == 2 {
diff --git a/pkg/websocketspec/handler.go b/pkg/websocketspec/handler.go
index cbdedf3..9d0b3c7 100644
--- a/pkg/websocketspec/handler.go
+++ b/pkg/websocketspec/handler.go
@@ -628,7 +628,10 @@ func (h *Handler) readMultiple(hookCtx *HookContext) (data interface{}, metadata
 	countQuery := h.db.NewSelect().Model(hookCtx.ModelPtr).Table(hookCtx.TableName)
 	if hookCtx.Options != nil {
 		for _, filter := range hookCtx.Options.Filters {
-			countQuery = countQuery.Where(fmt.Sprintf("%s %s ?", filter.Column, h.getOperatorSQL(filter.Operator)), filter.Value)
+			cond, args := h.buildFilterCondition(filter)
+			if cond != "" {
+				countQuery = countQuery.Where(cond, args...)
+			}
 		}
 	}
 	count, _ := countQuery.Count(hookCtx.Context)
@@ -800,14 +803,12 @@ func (h *Handler) applyFilterGroup(query common.SelectQuery, filters []common.Fi
 
 // buildFilterCondition builds a filter condition and returns it with args
 func (h *Handler) buildFilterCondition(filter common.FilterOption) (conditionString string, conditionArgs []interface{}) {
-	var condition string
-	var args []interface{}
-
+	if strings.EqualFold(filter.Operator, "in") {
+		cond, args := common.BuildInCondition(filter.Column, filter.Value)
+		return cond, args
+	}
 	operatorSQL := h.getOperatorSQL(filter.Operator)
-	condition = fmt.Sprintf("%s %s ?", filter.Column, operatorSQL)
-	args = []interface{}{filter.Value}
-
-	return condition, args
+	return fmt.Sprintf("%s %s ?", filter.Column, operatorSQL), []interface{}{filter.Value}
 }
 
 // setRowNumbersOnRecords sets the RowNumber field on each record if it exists