diff --git a/src/lib/Fursona.ts b/src/lib/Fursona.ts
index 7e4ca64..df4891d 100644
--- a/src/lib/Fursona.ts
+++ b/src/lib/Fursona.ts
@@ -38,3 +38,48 @@ export interface Sona {
 	birthdate?: string;
 	colors?: string[];
 }
+
+// Validate fursona
+export function validateFursona(fursona: Sona): string[] {
+	let reasons = [];
+	if (!fursona.name) reasons.push('Missing fursona name');
+	if (!fursona.species) reasons.push('Missing fursona species');
+	if (!fursona.description) reasons.push('Missing fursona description');
+	if (fursona.description.length > 250) reasons.push('Fursona description is too long');
+	if (fursona.ref && !isURL(fursona.ref)) reasons.push('Fursona ref is not a valid URL');
+	if (fursona.avatar && !isURL(fursona.avatar)) reasons.push('Fursona avatar is not a valid URL');
+	if (fursona.age && fursona.age < 0) reasons.push('Fursona age is negative');
+	if (fursona.birthdate && !isISO8601(fursona.birthdate))
+		reasons.push('Fursona birthdate is not a valid ISO 8601 date');
+	if (fursona.colors && !Array.isArray(fursona.colors))
+		reasons.push('Fursona colors is not an array');
+	if (fursona.colors && fursona.colors.some((color) => !isColor(color)))
+		reasons.push('Fursona colors contains an invalid color');
+	return reasons;
+}
+
+// Validate fursona schema
+export function validateFursonaSchema(fursonaSchema: FursonaSchema): boolean {
+	if (!fursonaSchema.sonas) return false;
+	if (!Array.isArray(fursonaSchema.sonas)) return false;
+	if (fursonaSchema.sonas.length > 10) return false;
+	if (fursonaSchema.sonas.some((sona) => !validateFursona(sona))) return false;
+	return true;
+}
+
+function isColor(color: string): boolean {
+	return /^#([0-9a-f]{3}){1,2}$/i.test(color);
+}
+
+function isURL(url: string): boolean {
+	try {
+		new URL(url);
+		return true;
+	} catch (err) {
+		return false;
+	}
+}
+
+function isISO8601(date: string): boolean {
+	return !isNaN(Date.parse(date));
+}
diff --git a/src/lib/components/Fursona.svelte b/src/lib/components/Fursona.svelte
index 0ce5ecb..a2c30b3 100644
--- a/src/lib/components/Fursona.svelte
+++ b/src/lib/components/Fursona.svelte
@@ -1,39 +1,67 @@
 <script lang="ts">
 	import { onMount } from 'svelte';
 	import type { FursonaSchema, Sona } from '$lib/Fursona';
+	import { validateFursona } from '$lib/Fursona';
 	export let fursona = {} as Sona;
 
+	const validation = validateFursona(fursona);
+
 	// Parse birthdate
 	if (fursona.birthdate) {
 		fursona.birthdate = new Date(fursona.birthdate);
 	}
+
+	function toggleReasons() {
+		const reasons = document.getElementById('reasons');
+		if (reasons.classList.contains('hidden')) {
+			reasons.classList.remove('hidden');
+		} else {
+			reasons.classList.add('hidden');
+		}
+	}
 </script>
 
 <div
 	class="flex flex-col items-center justify-center text-slate-900 dark:text-white dark:bg-slate-500"
-  >
-    {#if fursona.avatar}
-	  <img src={fursona.avatar} alt="{fursona.name} avatar image" class="rounded" />
+>
+	{#if validation.length > 0}
+		<div
+			class="flex flex-col items-center justify-center text-slate-900 dark:text-white dark:bg-slate-500"
+		>
+			<button class="text-center" on:click={toggleReasons}>
+				⚠️: Fursona data does not comply to schema
+			</button>
+			<div class="hidden" id="reasons">
+				{#each validation as error}
+					<ul class="list-inside text-center">
+						<li>{error}</li>
+					</ul>
+				{/each}
+			</div>
+		</div>
 	{/if}
-	<h1 class="text-3xl leading-none md:text-3xl lg:text-3xl">
-	  {fursona.name}
-	  {#if fursona.pronouns}
-		({fursona.pronouns})
-	  {/if}
+	{#if fursona.avatar}
+		<img src={fursona.avatar} alt="{fursona.name} avatar image" class="rounded" />
+	{/if}
+	<h1 class="text-3xl text-center leading-none md:text-3xl lg:text-3xl">
+		{fursona.name}
+		{#if fursona.pronouns}
+			({fursona.pronouns})
+		{/if}
 	</h1>
 	<h2 class="mb-2 text-2xl leading-none md:text-2xl lg:text-2xl">
-	  {#if fursona.gender}
-	    {fursona.gender}
-	  {/if}
-	  {fursona.species}
+		{#if fursona.gender}
+			{fursona.gender}
+		{/if}
+		{fursona.species}
 	</h2>
 	<p class="mb-3 text-center">{fursona.description}</p>
 	{#if fursona.birthdate && fursona.age}
-	  <p class="mb-3 text-center">🎂{fursona.birthdate.toLocaleDateString()} ({fursona.age})</p>
+		<p class="mb-3 text-center">🎂{fursona.birthdate.toLocaleDateString()} ({fursona.age})</p>
 	{:else if fursona.birthdate}
-	  <p class="mb-3 text-center">🎂{fursona.birthdate.toLocaleDateString()}</p>
+		<p class="mb-3 text-center">🎂{fursona.birthdate.toLocaleDateString()}</p>
 	{:else if fursona.age}
-	  <p class="mb-3 text-center">{fursona.age}</p>
+		<p class="mb-3 text-center">{fursona.age}</p>
 	{/if}
 	<div class="grid grid-cols-3 md:grid-cols-4 lg:grid-cols-4">
 		{#each fursona.colors as color}
@@ -42,12 +70,13 @@
 				<p class="text-sm font-mono">{color}</p>
 			</div>
 		{/each}
-	  </div>
+	</div>
 	{#if fursona.ref}
-	<a
-		href={fursona.ref}
-		target="_blank"
-		class="mb-4 mt-4 text-md text-blue-500 dark:text-blue-200 underline">View Ref Sheet</a>
+		<a
+			href={fursona.ref}
+			target="_blank"
+			class="mb-4 mt-4 text-md text-blue-500 dark:text-blue-200 underline">View Ref Sheet</a
+		>
 	{/if}
 </div>