diff --git a/frontend/src/lib/common.ts b/frontend/src/lib/common.ts
index fcdaa04524..c1917635ea 100644
--- a/frontend/src/lib/common.ts
+++ b/frontend/src/lib/common.ts
@@ -39,6 +39,7 @@ export interface SchemaProperty {
 	showExpr?: string
 	password?: boolean
 	order?: string[]
+	nullable?: boolean
 	dateFormat?: string
 }
 
@@ -62,6 +63,7 @@ export interface ModalSchemaProperty {
 	customErrorMessage?: string
 	showExpr?: string
 	password?: boolean
+	nullable?: boolean
 	dateFormat?: string
 }
 
@@ -85,6 +87,7 @@ export function modalToSchema(schema: ModalSchemaProperty): SchemaProperty {
 		multiselect: schema.multiselect,
 		showExpr: schema.showExpr,
 		password: schema.password,
+		nullable: schema.nullable,
 		dateFormat: schema.dateFormat
 	}
 }
diff --git a/frontend/src/lib/components/ArgInput.svelte b/frontend/src/lib/components/ArgInput.svelte
index 35c4e62ff4..7f013a2360 100644
--- a/frontend/src/lib/components/ArgInput.svelte
+++ b/frontend/src/lib/components/ArgInput.svelte
@@ -73,6 +73,7 @@
 	export let simpleTooltip: string | undefined = undefined
 	export let customErrorMessage: string | undefined = undefined
 	export let onlyMaskPassword = false
+	export let nullable: boolean = false
 
 	let seeEditable: boolean = enum_ != undefined || pattern != undefined
 	const dispatch = createEventDispatcher()
@@ -94,12 +95,17 @@
 	$: inputCat = computeInputCat(type, format, itemsType?.type, enum_, contentEncoding)
 	let rawValue: string | undefined = undefined
 
-	function computeDefaultValue(nvalue?: any, inputCat?: string, defaultValue?: any) {
+	function computeDefaultValue(
+		nvalue?: any,
+		inputCat?: string,
+		defaultValue?: any,
+		nnullable?: boolean
+	) {
 		if ((value == undefined || value == null) && !ignoreValueUndefined) {
 			value = defaultValue
 			if (defaultValue === undefined || defaultValue === null) {
 				if (inputCat === 'string') {
-					value = ''
+					value = nullable ? null : ''
 				} else if (inputCat == 'enum' && required) {
 					value = enum_?.[0]
 				} else if (inputCat == 'boolean') {
@@ -111,11 +117,15 @@
 				evalValueToRaw()
 			}
 		}
+
+		if (nnullable && type === 'string' && value === '') {
+			value = null
+		}
 	}
 
 	computeDefaultValue()
 
-	$: computeDefaultValue(value, inputCat, defaultValue)
+	$: computeDefaultValue(value, inputCat, defaultValue, nullable)
 
 	$: defaultValue != undefined && handleDefaultValueChange()
 
@@ -158,7 +168,10 @@
 	}
 
 	function validateInput(pattern: string | undefined, v: any, required: boolean): void {
-		if (required && (v == undefined || v == null || v === '')) {
+		if (nullable && emptyString(v)) {
+			error = ''
+			valid && (valid = true)
+		} else if (required && (v == undefined || v == null || v === '')) {
 			error = 'Required'
 			valid && (valid = false)
 		} else {
@@ -304,6 +317,19 @@
 								<ObjectTypeNarrowing bind:format />
 							{/if}
 						</div>
+						{#if !required && type === 'string'}
+							<div class="mt-2 border-t pt-4">
+								<Toggle
+									options={{
+										right: 'Nullable',
+										rightTooltip:
+											'If enabled, the default value will be null and not an empty string.'
+									}}
+									size="xs"
+									bind:checked={extra.nullable}
+								/>
+							</div>
+						{/if}
 					{/if}
 				</div>
 			{/if}
diff --git a/frontend/src/lib/components/EditableSchemaForm.svelte b/frontend/src/lib/components/EditableSchemaForm.svelte
index b7b5b34fdd..f2fea9ec69 100644
--- a/frontend/src/lib/components/EditableSchemaForm.svelte
+++ b/frontend/src/lib/components/EditableSchemaForm.svelte
@@ -151,6 +151,7 @@
 							bind:pickForField
 							bind:extra={schema.properties[argName]}
 							simpleTooltip={schemaFieldTooltip[argName]}
+							nullable={schema.properties[argName].nullable}
 						/>
 					{/if}
 				{/if}
diff --git a/frontend/src/lib/components/InputTransformForm.svelte b/frontend/src/lib/components/InputTransformForm.svelte
index 24aad7be94..d5d790f509 100644
--- a/frontend/src/lib/components/InputTransformForm.svelte
+++ b/frontend/src/lib/components/InputTransformForm.svelte
@@ -406,6 +406,7 @@
 					{itemPicker}
 					bind:pickForField
 					showSchemaExplorer
+					nullable={schema.properties[argName].nullable}
 				/>
 			{:else if arg.expr != undefined}
 				<div class="border mt-2">
diff --git a/frontend/src/lib/components/ModulePreviewForm.svelte b/frontend/src/lib/components/ModulePreviewForm.svelte
index 3d45eb819e..2f1dd60125 100644
--- a/frontend/src/lib/components/ModulePreviewForm.svelte
+++ b/frontend/src/lib/components/ModulePreviewForm.svelte
@@ -95,6 +95,7 @@
 							nestedRequired={schema.properties[argName].required}
 							itemsType={schema.properties[argName].items}
 							extra={schema.properties[argName]}
+							nullable={schema.properties[argName].nullable}
 						/>
 					{/if}
 					<div class="pt-6 mt-0.5">
diff --git a/frontend/src/lib/components/SchemaForm.svelte b/frontend/src/lib/components/SchemaForm.svelte
index f6847f9e3b..e66896e381 100644
--- a/frontend/src/lib/components/SchemaForm.svelte
+++ b/frontend/src/lib/components/SchemaForm.svelte
@@ -158,6 +158,7 @@
 								{showSchemaExplorer}
 								simpleTooltip={schemaFieldTooltip[argName]}
 								{onlyMaskPassword}
+								nullable={schema.properties[argName].nullable}
 							>
 								<svelte:fragment slot="actions">
 									{#if linkedSecretCandidates?.includes(argName)}
diff --git a/frontend/src/lib/components/SchemaModal.svelte b/frontend/src/lib/components/SchemaModal.svelte
index 88b769f8a8..762397135b 100644
--- a/frontend/src/lib/components/SchemaModal.svelte
+++ b/frontend/src/lib/components/SchemaModal.svelte
@@ -61,6 +61,7 @@
 					: undefined,
 			showExpr: schema.showExpr,
 			password: schema.password,
+			nullable: schema.nullable,
 			dateFormat: schema.format
 		}
 	}
@@ -135,6 +136,7 @@
 		property.items = undefined
 		property.showExpr = undefined
 		property.password = undefined
+		property.nullable = false
 		property.dateFormat = undefined
 		drawer.closeDrawer()
 	}
@@ -263,12 +265,32 @@
 						format={property.format}
 						extra={property}
 						disabled={property.password}
+						nullable={property.nullable}
 					/>
-					<Toggle
-						options={{ right: 'Required' }}
-						class="!justify-start"
-						bind:checked={property.required}
-					/>
+					<div>
+						<Toggle
+							options={{ right: 'Required' }}
+							size="xs"
+							bind:checked={property.required}
+							on:change={(event) => {
+								if (event?.detail) {
+									property.nullable = false
+								}
+							}}
+						/>
+						{#if property?.selectedType === 'string'}
+							<Toggle
+								options={{
+									right: 'Nullable',
+									rightTooltip:
+										'If enabled, the default value will be null and not an empty string.'
+								}}
+								size="xs"
+								bind:checked={property.nullable}
+								disabled={property?.required}
+							/>
+						{/if}
+					</div>
 				</div>
 				{#if isFlowInput}
 					<Alert type="info" title="Default not used by webhooks" size="xs" collapsible>