diff --git a/src/CollectionNode.tsx b/src/CollectionNode.tsx
index 098fc7e..92af66c 100644
--- a/src/CollectionNode.tsx
+++ b/src/CollectionNode.tsx
@@ -2,6 +2,7 @@ import React, { useEffect, useState, useRef, useCallback } from 'react'
 import { ValueNodeWrapper } from './ValueNodeWrapper'
 import { EditButtons, InputButtons } from './ButtonPanels'
 import { getCustomNode } from './CustomNode'
+import { getCustomKey } from './CustomKey'
 import {
   type CollectionNodeProps,
   type NodeData,
@@ -60,6 +61,8 @@ export const CollectionNode: React.FC<CollectionNodeProps> = (props) => {
     translate,
     customNodeDefinitions,
     customNodeData,
+    customKeyDefinitions,
+    customKeyData,
     jsonParse,
     jsonStringify,
     TextEditor,
@@ -308,6 +311,7 @@ export const CollectionNode: React.FC<CollectionNodeProps> = (props) => {
       }
 
       const childCustomNodeData = getCustomNode(customNodeDefinitions, childNodeData)
+      const childCustomKeyData = getCustomKey(customKeyDefinitions, childNodeData)
 
       return (
         <div
@@ -325,6 +329,7 @@ export const CollectionNode: React.FC<CollectionNodeProps> = (props) => {
               showCollectionCount={showCollectionCount}
               canDragOnto={canEdit}
               customNodeData={childCustomNodeData}
+              customKeyData={childCustomKeyData}
             />
           ) : (
             <ValueNodeWrapper
@@ -336,6 +341,7 @@ export const CollectionNode: React.FC<CollectionNodeProps> = (props) => {
               canDragOnto={canEdit}
               showLabel={collectionType === 'object' ? true : showArrayIndices}
               customNodeData={childCustomNodeData}
+              customKeyData={childCustomKeyData}
             />
           )}
         </div>
@@ -461,6 +467,8 @@ export const CollectionNode: React.FC<CollectionNodeProps> = (props) => {
         // but "header" is
         (e: React.MouseEvent) => e.stopPropagation(),
     emptyStringKey,
+    nodeData,
+    customKeyData,
   }
 
   const CollectionNodeComponent = (
diff --git a/src/CustomKey.ts b/src/CustomKey.ts
new file mode 100644
index 0000000..445711b
--- /dev/null
+++ b/src/CustomKey.ts
@@ -0,0 +1,23 @@
+import { type CustomKeyDefinition, type CustomKeyProps, type NodeData } from './types'
+
+export interface CustomKeyData {
+  CustomKey?: React.FC<CustomKeyProps>
+  customKeyProps?: Record<string, unknown>
+}
+
+// Fetches matching custom key definition (based on condition filter) and
+// returns the component and its props
+export const getCustomKey = (
+  customKeyDefinitions: CustomKeyDefinition[] = [],
+  nodeData: NodeData
+): CustomKeyData => {
+  const matchingDefinitions = customKeyDefinitions.filter(({ condition }) => condition(nodeData))
+  if (matchingDefinitions.length === 0) return {}
+
+  const { element, customKeyProps } = matchingDefinitions[0]
+
+  return {
+    CustomKey: element,
+    customKeyProps,
+  }
+}
diff --git a/src/JsonEditor.tsx b/src/JsonEditor.tsx
index 7b4af14..698eebb 100644
--- a/src/JsonEditor.tsx
+++ b/src/JsonEditor.tsx
@@ -34,6 +34,7 @@ import { ValueNodeWrapper } from './ValueNodeWrapper'
 
 import './style.css'
 import { getCustomNode } from './CustomNode'
+import { getCustomKey } from './CustomKey'
 
 const Editor: React.FC<JsonEditorProps> = ({
   data: srcData,
@@ -77,6 +78,7 @@ const Editor: React.FC<JsonEditorProps> = ({
   id,
   customText = {},
   customNodeDefinitions = [],
+  customKeyDefinitions = [],
   customButtons = [],
   jsonParse = JSON.parse,
   jsonStringify = (data, replacer) => JSON.stringify(data, replacer, 2),
@@ -341,6 +343,7 @@ const Editor: React.FC<JsonEditorProps> = ({
   )
 
   const customNodeData = getCustomNode(customNodeDefinitions, nodeData)
+  const customKeyData = getCustomKey(customKeyDefinitions, nodeData)
 
   const otherProps = {
     mainContainerRef: mainContainerRef as React.MutableRefObject<Element>,
@@ -379,6 +382,8 @@ const Editor: React.FC<JsonEditorProps> = ({
     translate,
     customNodeDefinitions,
     customNodeData,
+    customKeyDefinitions,
+    customKeyData,
     customButtons,
     parentData: null,
     jsonParse: jsonParseReplacement,
diff --git a/src/KeyDisplay.tsx b/src/KeyDisplay.tsx
index fd36f92..ec9314f 100644
--- a/src/KeyDisplay.tsx
+++ b/src/KeyDisplay.tsx
@@ -4,7 +4,13 @@
 
 import React from 'react'
 import { useTreeState } from './contexts'
-import { type KeyboardControlsFull, type CollectionKey, type ValueData } from './types'
+import {
+  type KeyboardControlsFull,
+  type CollectionKey,
+  type ValueData,
+  type NodeData,
+} from './types'
+import { type CustomKeyData } from './CustomKey'
 
 interface KeyDisplayProps {
   canEditKey: boolean
@@ -24,6 +30,8 @@ interface KeyDisplayProps {
   styles: React.CSSProperties
   getNextOrPrevious: (type: 'next' | 'prev') => CollectionKey[] | null
   emptyStringKey: string | null
+  nodeData?: NodeData
+  customKeyData?: CustomKeyData
 }
 
 export const KeyDisplay: React.FC<KeyDisplayProps> = ({
@@ -41,12 +49,32 @@ export const KeyDisplay: React.FC<KeyDisplayProps> = ({
   styles,
   getNextOrPrevious,
   emptyStringKey,
+  nodeData,
+  customKeyData,
 }) => {
   const { setCurrentlyEditingElement } = useTreeState()
 
   const displayKey = typeof name === 'number' ? String(name + (arrayIndexFromOne ? 1 : 0)) : name
 
-  if (!isEditingKey)
+  if (!isEditingKey) {
+    if (customKeyData?.CustomKey && nodeData) {
+      const { CustomKey, customKeyProps } = customKeyData
+      return (
+        <CustomKey
+          nodeData={nodeData}
+          name={name}
+          path={path}
+          value={nodeData.value}
+          styles={styles}
+          isEditingKey={false}
+          canEditKey={canEditKey}
+          handleEditKey={handleEditKey}
+          handleClick={handleClick}
+          customKeyProps={customKeyProps}
+        />
+      )
+    }
+
     return (
       <span
         className="jer-key-text"
@@ -62,6 +90,7 @@ export const KeyDisplay: React.FC<KeyDisplayProps> = ({
         {displayKey !== '' || emptyStringKey ? <span className="jer-key-colon">:</span> : null}
       </span>
     )
+  }
 
   return (
     <input
diff --git a/src/ValueNodeWrapper.tsx b/src/ValueNodeWrapper.tsx
index e4a9d27..9b67d16 100644
--- a/src/ValueNodeWrapper.tsx
+++ b/src/ValueNodeWrapper.tsx
@@ -315,6 +315,8 @@ export const ValueNodeWrapper: React.FC<ValueNodeProps> = (props) => {
     getNextOrPrevious: (type: 'next' | 'prev') =>
       getNextOrPrevious(nodeData.fullData, path, type, sort),
     emptyStringKey,
+    nodeData,
+    customKeyData: props.customKeyData,
   }
 
   const ValueComponent = showCustomNode ? (
diff --git a/src/index.ts b/src/index.ts
index 8432fbe..ec65183 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -28,6 +28,8 @@ export {
   type ValueNodeProps,
   type CustomNodeProps,
   type CustomNodeDefinition,
+  type CustomKeyProps,
+  type CustomKeyDefinition,
   type CustomTextDefinitions,
   type CustomTextFunction,
   type Theme,
diff --git a/src/types.ts b/src/types.ts
index 5196307..b4ab821 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -3,6 +3,7 @@ import { type Options as AssignOptions } from 'object-property-assigner'
 import { type LocalisedStrings, type TranslateFunction } from './localisation'
 import { type ExternalTriggers } from './hooks'
 import { CustomNodeData } from './CustomNode'
+import { CustomKeyData } from './CustomKey'
 
 export type JsonData = Record<string, unknown> | Array<unknown> | unknown
 
@@ -51,6 +52,8 @@ export interface JsonEditorProps {
   // enforcing consistency between the component and the definition that uses it
   // eslint-disable-next-line @typescript-eslint/no-explicit-any
   customNodeDefinitions?: CustomNodeDefinition<Record<string, any>, Record<string, any>>[]
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  customKeyDefinitions?: CustomKeyDefinition<Record<string, any>>[]
   customText?: CustomTextDefinitions
   customButtons?: CustomButtonDefinition[]
   jsonParse?: (input: string, reviver?: (key: string, value: string) => unknown) => JsonData
@@ -278,6 +281,8 @@ interface BaseNodeProps {
   translate: TranslateFunction
   customNodeDefinitions: CustomNodeDefinition[]
   customNodeData: CustomNodeData
+  customKeyDefinitions: CustomKeyDefinition[]
+  customKeyData: CustomKeyData
   customButtons: CustomButtonDefinition[]
   errorMessageTimeout: number
   keyboardControls: KeyboardControlsFull
@@ -367,6 +372,26 @@ export interface CustomNodeDefinition<T = Record<string, unknown>, U = Record<st
   parseReviver?: (stringified: string) => unknown
 }
 
+export interface CustomKeyProps<T = Record<string, unknown>> {
+  nodeData: NodeData
+  name: string | number
+  path: CollectionKey[]
+  value: JsonData
+  styles: React.CSSProperties
+  isEditingKey: boolean
+  canEditKey: boolean
+  handleEditKey: (newKey: string) => void
+  handleClick?: (e: React.MouseEvent) => void
+  customKeyProps?: T
+}
+
+export interface CustomKeyDefinition<T = Record<string, unknown>> {
+  condition: FilterFunction
+  element: React.FC<CustomKeyProps<T>>
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  customKeyProps?: T
+}
+
 export type CustomTextDefinitions = Partial<{ [key in keyof LocalisedStrings]: CustomTextFunction }>
 
 export interface CustomButtonDefinition {