diff --git a/packages/core/src/client/webcomponents/index.ts b/packages/core/src/client/webcomponents/index.ts
index da4da964..6ae4c366 100644
--- a/packages/core/src/client/webcomponents/index.ts
+++ b/packages/core/src/client/webcomponents/index.ts
@@ -1,3 +1,25 @@
 export * from './components/DockEmbedded'
 export * from './components/DockStandalone'
+/**
+ * Opt-in strict types for the json-render base catalog — most spec authors
+ * use the fully open `JsonRenderElement` from `@vitejs/devtools-kit` instead;
+ * import these only to narrow a specific element (`JsonRenderElement<'Badge', BadgeProps>`).
+ */
+export type {
+  BadgeProps,
+  ButtonProps,
+  CodeBlockProps,
+  DataTableColumn,
+  DataTableProps,
+  DividerProps,
+  IconProps,
+  JsonRenderElement,
+  KeyValueTableProps,
+  ProgressProps,
+  SwitchProps,
+  TextInputProps,
+  TextProps,
+  TreeProps,
+} from './json-render/registry'
+
 export * from './state/docks'
diff --git a/packages/core/src/client/webcomponents/json-render/components/Badge.ts b/packages/core/src/client/webcomponents/json-render/components/Badge.ts
index e2bfd0ba..ab358739 100644
--- a/packages/core/src/client/webcomponents/json-render/components/Badge.ts
+++ b/packages/core/src/client/webcomponents/json-render/components/Badge.ts
@@ -1,14 +1,21 @@
-import type { RegistryComponentProps } from './types'
 import { defineComponent, h } from 'vue'
 import { colors } from './tokens'
+import { registryProps } from './types'
+
+export interface BadgeProps {
+  text?: string
+  variant?: 'default' | 'info' | 'success' | 'warning' | 'danger'
+  title?: string
+  minWidth?: number
+}
 
 export const Badge = defineComponent({
   name: 'JrBadge',
-  props: ['element', 'emit', 'on', 'bindings', 'loading'],
-  setup(ctx: RegistryComponentProps) {
+  props: registryProps<'Badge', BadgeProps>(),
+  setup(ctx) {
     return () => {
       const { text, variant = 'default', title, minWidth } = ctx.element.props
-      const c = colors[variant as keyof typeof colors] || colors.default
+      const c = colors[variant] || colors.default
       // Base catalog `minWidth` is a number of pixels.
       const minWidthCss = minWidth == null ? undefined : (typeof minWidth === 'number' ? `${minWidth}px` : minWidth)
       return h('span', {
diff --git a/packages/core/src/client/webcomponents/json-render/components/Button.ts b/packages/core/src/client/webcomponents/json-render/components/Button.ts
index b005864c..7c397399 100644
--- a/packages/core/src/client/webcomponents/json-render/components/Button.ts
+++ b/packages/core/src/client/webcomponents/json-render/components/Button.ts
@@ -1,15 +1,22 @@
-import type { RegistryComponentProps } from './types'
 import { defineComponent, h } from 'vue'
 import BaseButton from '../../components/display/Button.vue'
 import DockIcon from '../../components/dock/DockIcon.vue'
+import { registryProps } from './types'
 
 type BaseVariant = 'primary' | 'secondary' | 'ghost' | 'danger'
 const VARIANTS = new Set<BaseVariant>(['primary', 'secondary', 'ghost', 'danger'])
 
+export interface ButtonProps {
+  label?: string
+  variant?: BaseVariant
+  icon?: string
+  disabled?: boolean
+}
+
 export const Button = defineComponent({
   name: 'JrButton',
-  props: ['element', 'emit', 'on', 'bindings', 'loading'],
-  setup(ctx: RegistryComponentProps) {
+  props: registryProps<'Button', ButtonProps>(),
+  setup(ctx) {
     return () => {
       const { label, icon, variant = 'secondary', disabled } = ctx.element.props
       const press = ctx.on('press')
diff --git a/packages/core/src/client/webcomponents/json-render/components/CodeBlock.ts b/packages/core/src/client/webcomponents/json-render/components/CodeBlock.ts
index 00491b86..04a850da 100644
--- a/packages/core/src/client/webcomponents/json-render/components/CodeBlock.ts
+++ b/packages/core/src/client/webcomponents/json-render/components/CodeBlock.ts
@@ -1,11 +1,18 @@
-import type { RegistryComponentProps } from './types'
 import { defineComponent, h } from 'vue'
 import { borderSolid, surfaceMuted } from './tokens'
+import { registryProps } from './types'
+
+export interface CodeBlockProps {
+  code?: string
+  filename?: string
+  language?: string
+  height?: number
+}
 
 export const CodeBlock = defineComponent({
   name: 'JrCodeBlock',
-  props: ['element', 'emit', 'on', 'bindings', 'loading'],
-  setup(ctx: RegistryComponentProps) {
+  props: registryProps<'CodeBlock', CodeBlockProps>(),
+  setup(ctx) {
     return () => {
       const { code, filename, language, height } = ctx.element.props
       const header = filename || language
diff --git a/packages/core/src/client/webcomponents/json-render/components/DataTable.ts b/packages/core/src/client/webcomponents/json-render/components/DataTable.ts
index b4455a9a..453e1a72 100644
--- a/packages/core/src/client/webcomponents/json-render/components/DataTable.ts
+++ b/packages/core/src/client/webcomponents/json-render/components/DataTable.ts
@@ -1,18 +1,29 @@
-import type { RegistryComponentProps } from './types'
 import { defineComponent, h } from 'vue'
 import { bg, border, borderMuted, borderSolid, hoverOverlay } from './tokens'
+import { registryProps } from './types'
+
+export interface DataTableColumn {
+  key: string
+  label?: string
+  width?: string
+}
+
+export interface DataTableProps {
+  columns?: (string | DataTableColumn)[]
+  rows?: Record<string, unknown>[]
+  height?: number
+}
 
 export const DataTable = defineComponent({
   name: 'JrDataTable',
-  props: ['element', 'emit', 'on', 'bindings', 'loading'],
-  setup(ctx: RegistryComponentProps) {
+  props: registryProps<'DataTable', DataTableProps>(),
+  setup(ctx) {
     return () => {
       const { columns: rawColumns = [], rows = [], height } = ctx.element.props
       const rowClick = ctx.on('rowClick')
 
       // Base catalog columns are `string | { key, label? }`; normalize to objects.
-      const columns = (rawColumns as (string | { key: string, label?: string, width?: string })[])
-        .map(col => (typeof col === 'string' ? { key: col } : col))
+      const columns = rawColumns.map(col => (typeof col === 'string' ? { key: col } : col))
 
       return h('div', {
         class: 'jr-data-table',
@@ -30,7 +41,7 @@ export const DataTable = defineComponent({
           h('thead', [
             h('tr', {
               style: { borderBottom: borderSolid(border) },
-            }, columns.map((col: any) =>
+            }, columns.map(col =>
               h('th', {
                 style: {
                   padding: '8px',
@@ -47,7 +58,7 @@ export const DataTable = defineComponent({
               }, col.label ?? col.key),
             )),
           ]),
-          h('tbody', rows.map((row: any, index: number) =>
+          h('tbody', rows.map((row, index) =>
             h('tr', {
               key: index,
               style: {
@@ -57,7 +68,7 @@ export const DataTable = defineComponent({
               onClick: rowClick.bound ? () => rowClick.emit() : undefined,
               onMouseenter: (e: MouseEvent) => { (e.currentTarget as HTMLElement).style.backgroundColor = hoverOverlay },
               onMouseleave: (e: MouseEvent) => { (e.currentTarget as HTMLElement).style.backgroundColor = '' },
-            }, columns.map((col: any) =>
+            }, columns.map(col =>
               h('td', {
                 style: { padding: '6px 8px', fontFamily: 'monospace', overflow: 'hidden', textOverflow: 'ellipsis' },
               }, String(row[col.key] ?? '')),
diff --git a/packages/core/src/client/webcomponents/json-render/components/Divider.ts b/packages/core/src/client/webcomponents/json-render/components/Divider.ts
index 8c436a0b..4c4253b2 100644
--- a/packages/core/src/client/webcomponents/json-render/components/Divider.ts
+++ b/packages/core/src/client/webcomponents/json-render/components/Divider.ts
@@ -1,11 +1,15 @@
-import type { RegistryComponentProps } from './types'
 import { defineComponent, h } from 'vue'
 import { borderSolid } from './tokens'
+import { registryProps } from './types'
+
+export interface DividerProps {
+  label?: string
+}
 
 export const Divider = defineComponent({
   name: 'JrDivider',
-  props: ['element', 'emit', 'on', 'bindings', 'loading'],
-  setup(ctx: RegistryComponentProps) {
+  props: registryProps<'Divider', DividerProps>(),
+  setup(ctx) {
     return () => {
       const { label } = ctx.element.props
       const rule = { flex: 1, border: 'none', borderTop: borderSolid() }
diff --git a/packages/core/src/client/webcomponents/json-render/components/Icon.ts b/packages/core/src/client/webcomponents/json-render/components/Icon.ts
index 525fc83f..082a7563 100644
--- a/packages/core/src/client/webcomponents/json-render/components/Icon.ts
+++ b/packages/core/src/client/webcomponents/json-render/components/Icon.ts
@@ -1,11 +1,15 @@
-import type { RegistryComponentProps } from './types'
 import { defineComponent, h } from 'vue'
-import { useIconSvg } from './types'
+import { registryProps, useIconSvg } from './types'
+
+export interface IconProps {
+  name?: string
+  size?: number
+}
 
 export const Icon = defineComponent({
   name: 'JrIcon',
-  props: ['element', 'emit', 'on', 'bindings', 'loading'],
-  setup(ctx: RegistryComponentProps) {
+  props: registryProps<'Icon', IconProps>(),
+  setup(ctx) {
     const iconSvg = useIconSvg(() => ctx.element.props.name)
 
     return () => {
diff --git a/packages/core/src/client/webcomponents/json-render/components/KeyValueTable.ts b/packages/core/src/client/webcomponents/json-render/components/KeyValueTable.ts
index e4159dba..a31d4a3a 100644
--- a/packages/core/src/client/webcomponents/json-render/components/KeyValueTable.ts
+++ b/packages/core/src/client/webcomponents/json-render/components/KeyValueTable.ts
@@ -1,14 +1,18 @@
-import type { RegistryComponentProps } from './types'
 import { defineComponent, h } from 'vue'
 import { borderSolid, borderSubtle } from './tokens'
+import { registryProps } from './types'
+
+export interface KeyValueTableProps {
+  data?: Record<string, unknown>
+}
 
 export const KeyValueTable = defineComponent({
   name: 'JrKeyValueTable',
-  props: ['element', 'emit', 'on', 'bindings', 'loading'],
-  setup(ctx: RegistryComponentProps) {
+  props: registryProps<'KeyValueTable', KeyValueTableProps>(),
+  setup(ctx) {
     return () => {
       const { data = {} } = ctx.element.props
-      const entries = Object.entries(data as Record<string, unknown>)
+      const entries = Object.entries(data)
       return h('div', { class: 'jr-kv-table' }, [
         h('table', {
           style: { width: '100%', borderCollapse: 'collapse', fontSize: '12px' },
diff --git a/packages/core/src/client/webcomponents/json-render/components/Progress.ts b/packages/core/src/client/webcomponents/json-render/components/Progress.ts
index 25aec930..399204bd 100644
--- a/packages/core/src/client/webcomponents/json-render/components/Progress.ts
+++ b/packages/core/src/client/webcomponents/json-render/components/Progress.ts
@@ -1,11 +1,17 @@
-import type { RegistryComponentProps } from './types'
 import { defineComponent, h } from 'vue'
 import { primary, surfaceBadge } from './tokens'
+import { registryProps } from './types'
+
+export interface ProgressProps {
+  value: number
+  max?: number
+  label?: string
+}
 
 export const Progress = defineComponent({
   name: 'JrProgress',
-  props: ['element', 'emit', 'on', 'bindings', 'loading'],
-  setup(ctx: RegistryComponentProps) {
+  props: registryProps<'Progress', ProgressProps>(),
+  setup(ctx) {
     return () => {
       const { value, max = 100, label } = ctx.element.props
       const percent = Math.min(100, Math.max(0, (value / max) * 100))
diff --git a/packages/core/src/client/webcomponents/json-render/components/Switch.ts b/packages/core/src/client/webcomponents/json-render/components/Switch.ts
index 8a23ed75..177e1ecf 100644
--- a/packages/core/src/client/webcomponents/json-render/components/Switch.ts
+++ b/packages/core/src/client/webcomponents/json-render/components/Switch.ts
@@ -1,12 +1,19 @@
-import type { RegistryComponentProps } from './types'
 import { useBoundProp } from '@json-render/vue'
 import { defineComponent, h } from 'vue'
 import { primary, surfaceSubtle } from './tokens'
+import { registryProps } from './types'
+
+export interface SwitchProps {
+  /** Two-way bindable via `{ $bindState: '...' }`. */
+  value?: boolean
+  label?: string
+  disabled?: boolean
+}
 
 export const Switch = defineComponent({
   name: 'JrSwitch',
-  props: ['element', 'emit', 'on', 'bindings', 'loading'],
-  setup(ctx: RegistryComponentProps) {
+  props: registryProps<'Switch', SwitchProps>(),
+  setup(ctx) {
     return () => {
       const { label, disabled } = ctx.element.props
       const [value, setValue] = useBoundProp<boolean>(ctx.element.props.value, ctx.bindings?.value)
diff --git a/packages/core/src/client/webcomponents/json-render/components/Text.ts b/packages/core/src/client/webcomponents/json-render/components/Text.ts
index e06572c7..d5a58a28 100644
--- a/packages/core/src/client/webcomponents/json-render/components/Text.ts
+++ b/packages/core/src/client/webcomponents/json-render/components/Text.ts
@@ -1,11 +1,17 @@
-import type { RegistryComponentProps } from './types'
 import { defineComponent, h } from 'vue'
 import { surfaceSubtle } from './tokens'
+import { registryProps } from './types'
+
+export interface TextProps {
+  text?: string
+  variant?: 'heading' | 'subheading' | 'body' | 'caption' | 'code'
+  weight?: 'normal' | 'medium' | 'bold'
+}
 
 export const Text = defineComponent({
   name: 'JrText',
-  props: ['element', 'emit', 'on', 'bindings', 'loading'],
-  setup(ctx: RegistryComponentProps) {
+  props: registryProps<'Text', TextProps>(),
+  setup(ctx) {
     return () => {
       const { text, variant = 'body', weight } = ctx.element.props
       const styles: Record<string, Record<string, string>> = {
diff --git a/packages/core/src/client/webcomponents/json-render/components/TextInput.ts b/packages/core/src/client/webcomponents/json-render/components/TextInput.ts
index 712643a0..7fcf0a3a 100644
--- a/packages/core/src/client/webcomponents/json-render/components/TextInput.ts
+++ b/packages/core/src/client/webcomponents/json-render/components/TextInput.ts
@@ -1,12 +1,20 @@
-import type { RegistryComponentProps } from './types'
 import { useBoundProp } from '@json-render/vue'
 import { defineComponent, h } from 'vue'
 import { borderInput, borderSolid } from './tokens'
+import { registryProps } from './types'
+
+export interface TextInputProps {
+  /** Two-way bindable via `{ $bindState: '...' }`. */
+  value?: string
+  placeholder?: string
+  label?: string
+  disabled?: boolean
+}
 
 export const TextInput = defineComponent({
   name: 'JrTextInput',
-  props: ['element', 'emit', 'on', 'bindings', 'loading'],
-  setup(ctx: RegistryComponentProps) {
+  props: registryProps<'TextInput', TextInputProps>(),
+  setup(ctx) {
     return () => {
       const { placeholder, label, disabled } = ctx.element.props
       const [value, setValue] = useBoundProp<string>(ctx.element.props.value, ctx.bindings?.value)
diff --git a/packages/core/src/client/webcomponents/json-render/components/Tree.ts b/packages/core/src/client/webcomponents/json-render/components/Tree.ts
index 702c166d..d206a617 100644
--- a/packages/core/src/client/webcomponents/json-render/components/Tree.ts
+++ b/packages/core/src/client/webcomponents/json-render/components/Tree.ts
@@ -1,12 +1,17 @@
 import type { VNode } from 'vue'
-import type { RegistryComponentProps } from './types'
 import { defineComponent, h, ref } from 'vue'
 import { syntaxNumber, syntaxString } from './tokens'
+import { registryProps } from './types'
+
+export interface TreeProps {
+  data?: unknown
+  defaultExpanded?: boolean
+}
 
 export const Tree = defineComponent({
   name: 'JrTree',
-  props: ['element', 'emit', 'on', 'bindings', 'loading'],
-  setup(ctx: RegistryComponentProps) {
+  props: registryProps<'Tree', TreeProps>(),
+  setup(ctx) {
     function renderNode(value: unknown, key: string, depth: number, expandLevel: number): VNode {
       const isExpanded = ref(depth < expandLevel)
       const isObject = value !== null && typeof value === 'object'
diff --git a/packages/core/src/client/webcomponents/json-render/components/types.ts b/packages/core/src/client/webcomponents/json-render/components/types.ts
index 67906b48..e7bf116f 100644
--- a/packages/core/src/client/webcomponents/json-render/components/types.ts
+++ b/packages/core/src/client/webcomponents/json-render/components/types.ts
@@ -1,14 +1,32 @@
+import type { UIElement } from '@json-render/core'
+import type { PropType } from 'vue'
 import { ref, watchEffect } from 'vue'
 import { getIconifySvg } from '../../utils/iconify'
 
-export interface RegistryComponentProps {
-  element: { type: string, props: Record<string, any> }
+export interface RegistryComponentProps<Type extends string = string, Props = Record<string, any>> {
+  element: UIElement<Type, Props>
   emit: (event: string) => void
   on: (event: string) => { emit: () => void, shouldPreventDefault: boolean, bound: boolean }
   bindings?: Record<string, string>
   loading?: boolean
 }
 
+/**
+ * Vue props for a registry component, typed to its own element shape.
+ * Replaces the untyped `props: ['element', 'emit', ...]` array form so
+ * `defineComponent` infers `setup`'s `ctx` as `RegistryComponentProps<Type, Props>`
+ * instead of leaving `element.props` an untyped `Record<string, any>`.
+ */
+export function registryProps<Type extends string = string, Props = Record<string, any>>() {
+  return {
+    element: { type: Object as PropType<UIElement<Type, Props>>, required: true as const },
+    emit: { type: Function as PropType<(event: string) => void>, required: true as const },
+    on: { type: Function as PropType<(event: string) => { emit: () => void, shouldPreventDefault: boolean, bound: boolean }>, required: true as const },
+    bindings: { type: Object as PropType<Record<string, string>>, required: false as const },
+    loading: { type: Boolean, required: false as const },
+  }
+}
+
 export function useIconSvg(getName: () => string | undefined) {
   const svg = ref<string | null>(null)
   watchEffect(async () => {
diff --git a/packages/core/src/client/webcomponents/json-render/registry.ts b/packages/core/src/client/webcomponents/json-render/registry.ts
index 06824684..bd21fa75 100644
--- a/packages/core/src/client/webcomponents/json-render/registry.ts
+++ b/packages/core/src/client/webcomponents/json-render/registry.ts
@@ -22,6 +22,26 @@ import { UnsupportedComponent } from './components/UnsupportedComponent'
  */
 export { UnsupportedComponent }
 
+/**
+ * Per-component `props` shapes, co-located with each component and
+ * re-exported here as this catalog's public type surface — the single
+ * source of truth a spec author can opt into for strict typing, instead of
+ * each component's props duplicated into a separate types package.
+ */
+export type { BadgeProps } from './components/Badge'
+export type { ButtonProps } from './components/Button'
+export type { CodeBlockProps } from './components/CodeBlock'
+export type { DataTableColumn, DataTableProps } from './components/DataTable'
+export type { DividerProps } from './components/Divider'
+export type { IconProps } from './components/Icon'
+export type { KeyValueTableProps } from './components/KeyValueTable'
+export type { ProgressProps } from './components/Progress'
+export type { SwitchProps } from './components/Switch'
+export type { TextProps } from './components/Text'
+export type { TextInputProps } from './components/TextInput'
+export type { TreeProps } from './components/Tree'
+export type { UIElement as JsonRenderElement } from '@json-render/core'
+
 export const devtoolsRegistry: Record<string, Component> = {
   Stack,
   Card,
diff --git a/test/__snapshots__/tsnapi/@vitejs/devtools/client/webcomponents.snapshot.d.ts b/test/__snapshots__/tsnapi/@vitejs/devtools/client/webcomponents.snapshot.d.ts
index 8e82716b..ed75e479 100644
--- a/test/__snapshots__/tsnapi/@vitejs/devtools/client/webcomponents.snapshot.d.ts
+++ b/test/__snapshots__/tsnapi/@vitejs/devtools/client/webcomponents.snapshot.d.ts
@@ -1,6 +1,84 @@
 /**
  * Generated by tsnapi — public API snapshot of `@vitejs/devtools/client/webcomponents`
  */
+// #region Interfaces
+export interface BadgeProps {
+  text?: string;
+  variant?: 'default' | 'info' | 'success' | 'warning' | 'danger';
+  title?: string;
+  minWidth?: number;
+}
+export interface ButtonProps {
+  label?: string;
+  variant?: BaseVariant;
+  icon?: string;
+  disabled?: boolean;
+}
+export interface CodeBlockProps {
+  code?: string;
+  filename?: string;
+  language?: string;
+  height?: number;
+}
+export interface DataTableColumn {
+  key: string;
+  label?: string;
+  width?: string;
+}
+export interface DataTableProps {
+  columns?: (string | DataTableColumn)[];
+  rows?: Record<string, unknown>[];
+  height?: number;
+}
+export interface DividerProps {
+  label?: string;
+}
+export interface IconProps {
+  name?: string;
+  size?: number;
+}
+export interface JsonRenderElement<T extends string = string, P = Record<string, unknown>> {
+  type: T;
+  props: P;
+  children?: string[];
+  visible?: VisibilityCondition;
+  on?: Record<string, ActionBinding | ActionBinding[]>;
+  repeat?: {
+    statePath: string;
+    key?: string;
+  };
+  watch?: Record<string, ActionBinding | ActionBinding[]>;
+}
+export interface KeyValueTableProps {
+  data?: Record<string, unknown>;
+}
+export interface ProgressProps {
+  value: number;
+  max?: number;
+  label?: string;
+}
+export interface SwitchProps {
+  value?: boolean;
+  label?: string;
+  disabled?: boolean;
+}
+export interface TextInputProps {
+  value?: string;
+  placeholder?: string;
+  label?: string;
+  disabled?: boolean;
+}
+export interface TextProps {
+  text?: string;
+  variant?: 'heading' | 'subheading' | 'body' | 'caption' | 'code';
+  weight?: 'normal' | 'medium' | 'bold';
+}
+export interface TreeProps {
+  data?: unknown;
+  defaultExpanded?: boolean;
+}
+// #endregion
+
 // #region Functions
 export declare function createDockEntryState(_: DevToolsDockEntry, _: Ref<DevToolsDockEntry | null>): DockEntryState;
 export declare function DEFAULT_DOCK_PANEL_STORE(): DockPanelStorage;