Use zod preprocess to coerce string to number and string to boolean before performing zod validations. Using error messages on UI.

src/lib/components/search/advancedSearch/index.svelte

@@ -3,20 +3,28 @@
 	import { boredState } from '$lib/stores/boredState';
 
 	export let form: ActionData;
+	const errors = form?.errors;
 	let submitting = $boredState?.loading;
-	let minAge = +form?.minAge || 1;
+	let minAge = +form?.data?.minAge || 1;
-	let minPlayers = +form?.minPlayers || 1;
+	let minPlayers = +form?.data?.minPlayers || 1;
-	let maxPlayers = +form?.maxPlayers || 1;
+	let maxPlayers = +form?.data?.maxPlayers || 1;
-	let exactMinPlayers = form?.exactMinPlayers || false;
+	let exactMinPlayers = Boolean(form?.data?.exactMinPlayers) || false;
-	let exactMaxPlayers = form?.exactMaxPlayers || false;
+	let exactMaxPlayers = Boolean(form?.data?.exactMaxPlayers) || false;
 </script>
 
 <fieldset class="advanced-search" aria-busy={submitting} disabled={submitting}>
 	<div>
 		<label for="minAge">
 			Min Age
-			<input id="minAge" name="minAge" bind:value={minAge} type="number" min="1" max="120" />
+			<input id="minAge" name="minAge" bind:value={minAge} type="number" min={1} max={120} />
 		</label>
+		{#if form?.errors?.minAge}
+			<div id="minPlayers-error" class="error">
+				<p aria-label={`Error: ${form?.errors?.minAge}`} class="center">
+					{form?.errors?.minAge}
+				</p>
+			</div>
+		{/if}
 	</div>
 	<div>
 		<label for="minPlayers">
@@ -26,8 +34,8 @@
 				name="minPlayers"
 				bind:value={minPlayers}
 				type="number"
-				min="1"
+				min={1}
-				max="50"
+				max={50}
 			/>
 		</label>
 		<label for="exactMinPlayers" style="display: flex; gap: 1rem; place-items: center;">
@@ -37,12 +45,13 @@
 				type="checkbox"
 				name="exactMinPlayers"
 				bind:checked={exactMinPlayers}
+				bind:value={exactMinPlayers}
 			/>
 		</label>
-		{#if form?.error?.id === 'minPlayers'}
+		{#if form?.errors?.minPlayers}
 			<div id="minPlayers-error" class="error">
-				<p aria-label={`Error: ${form.error.message}`} class="center">
+				<p aria-label={`Error: ${form?.errors?.minPlayers}`} class="center">
-					Error: {form.error.message}
+					{form?.errors?.minPlayers}
 				</p>
 			</div>
 		{/if}
@@ -55,8 +64,8 @@
 				name="maxPlayers"
 				bind:value={maxPlayers}
 				type="number"
-				min="1"
+				min={1}
-				max="50"
+				max={50}
 			/>
 		</label>
 		<label for="exactMaxPlayers" style="display: flex; gap: 1rem; place-items: center;">
@@ -66,6 +75,7 @@
 				type="checkbox"
 				name="exactMaxPlayers"
 				bind:checked={exactMaxPlayers}
+				bind:value={exactMaxPlayers}
 			/>
 		</label>
 		{#if form?.error?.id === 'maxPlayers'}

src/lib/components/search/textSearch/index.svelte

@@ -25,6 +25,7 @@
 	// console.log('search page data', data);
 	export let form: ActionData;
 	// console.log('search page form', form);
+	const errors = form?.errors;
 
 	export let showButton: boolean = false;
 	export let advancedSearch: boolean = false;
@@ -37,7 +38,7 @@
 	let totalItems = form?.totalCount || data?.totalCount || 0;
 	let submitting = $boredState?.loading;
 	let name = form?.name || '';
-	let disclosureOpen = false;
+	let disclosureOpen = errors || false;
 
 	$: skip = (page - 1) * pageSize;
 	$: showPagination = $gameStore?.length > 1;

src/lib/zodValidation.ts

@@ -1,4 +1,4 @@
-import { z } from 'zod';
+import { z, ZodNumber, ZodOptional } from 'zod';
 import zodToJsonSchema from 'zod-to-json-schema';
 
 export const BoardGameSearch = z.object({
@@ -16,14 +16,30 @@ export const saved_game_schema = z.object({
   playtime: z.string()
 });
 
+// https://github.com/colinhacks/zod/discussions/330
+// function IntegerString
+//   <schema extends (ZodNumber | ZodOptional<ZodNumber>)>
+//   (schema: schema)
+// {
+//   return (
+//     z.preprocess((value) => (
+//       ( (typeof value === "string") ? parseInt(value, 10)
+//       : (typeof value === "number") ? value
+//       :                               undefined
+//     )), schema)
+//   )
+// }
+
+// minPlayers: IntegerString(z.number().min(1).max(50).optional());
+
 export const search_schema = z.object({
   name: z.string().trim().optional(),
-  minAge: z.number().min(1).max(120).optional(),
+  minAge: z.preprocess((a) => parseInt(z.string().parse(a), 10), z.number().min(1).max(120).optional()),
-  minPlayers: z.number().min(1).max(50).optional(),
+  minPlayers: z.preprocess((a) => parseInt(z.string().parse(a), 10), z.number().min(1).max(50).optional()),
-  maxPlayers: z.number().min(1).max(50).optional(),
+  maxPlayers: z.preprocess((a) => parseInt(z.string().parse(a), 10), z.number().min(1).max(50).optional()),
-  exactMinAge: z.boolean().optional(),
+  exactMinAge: z.preprocess((a) => Boolean(a), z.boolean().optional()),
-  exactMinPlayers: z.boolean().optional(),
+  exactMinPlayers: z.preprocess((a) => Boolean(a), z.boolean().optional()),
-  exactMaxPlayers: z.boolean().optional(),
+  exactMaxPlayers: z.preprocess((a) => Boolean(a), z.boolean().optional())
 })
   .superRefine(({ minPlayers, maxPlayers, minAge, exactMinAge, exactMinPlayers, exactMaxPlayers }, ctx) => {
     console.log({ minPlayers, maxPlayers });

src/routes/+page.svelte

@@ -5,7 +5,9 @@
 	import Random from '$lib/components/random/index.svelte';
 
 	export let data: PageData;
+	console.log('data', data);
 	export let form: ActionData;
+	console.log('form', form);
 </script>
 
 <svelte:head>

src/routes/search/+page.server.ts

@@ -18,6 +18,7 @@ export const actions: Actions = {
     console.log("In search action specific")
     // Do things in here
     const formData = Object.fromEntries(await request.formData());
+    console.log('formData', formData);
     console.log('passed in limit:', formData?.limit)
     console.log('passed in skip:', formData?.skip)
     const limit = formData?.limit || 10;
@@ -26,8 +27,8 @@ export const actions: Actions = {
     const queryParams: SearchQuery = {
       order_by: 'rank',
       ascending: false,
-      limit: parseInt(limit),
+      limit: +limit,
-      skip: parseInt(skip),
+      skip: +skip,
       client_id: BOARD_GAME_ATLAS_CLIENT_ID,
       fuzzy_match: true,
       name: ''
@@ -40,14 +41,8 @@ export const actions: Actions = {
     if (random) {
       queryParams.random = random;
     } else {
-      // const minAge = form.get('minAge');
-      // const minPlayers = form.get('minPlayers');
-      // const maxPlayers = form.get('maxPlayers');
-      // const exactMinAge = form.get('exactMinAge') || false;
-      // const exactMinPlayers = form.get('exactMinPlayers') || false;
-      // const exactMaxPlayers = form.get('exactMaxPlayers') || false;
-
       try {
+        console.log('Parsed', search_schema.parse(formData))
         const {
           name,
           minAge,
@@ -58,7 +53,6 @@ export const actions: Actions = {
           exactMaxPlayers
         } = search_schema.parse(formData);
 
-        console.log('Parsed', search_schema.parse(formData))
         
         if (minAge) {
           if (exactMinAge) {
@@ -87,7 +81,6 @@ export const actions: Actions = {
           queryParams.name = name;
         }
       } catch (error: unknown) {
-
         if (error instanceof ZodError) {
           const { fieldErrors: errors } = error.flatten();
           return invalid(400, { data: formData, errors });