diff --git a/packages/ipfs-message-port-client/src/core.js b/packages/ipfs-message-port-client/src/core.js
index 7144b6e928..388fde52d6 100644
--- a/packages/ipfs-message-port-client/src/core.js
+++ b/packages/ipfs-message-port-client/src/core.js
@@ -49,6 +49,8 @@ const iterateReadableStream = require('browser-readablestream-to-it')
 /**
  * @typedef {import('ipfs-message-port-server/src/core').CoreService} CoreService
  * @typedef {import('ipfs-message-port-server/src/core').AddedEntry} AddedEntry
+ * @typedef {import('ipfs-message-port-server/src/core').EncodedLsEntry} EncodedLsEntry
+ * @typedef {import('ipfs-message-port-server/src/core').LsEntry} LsEntry
  * @typedef {import('./client').ClientTransport} Transport
  */
 
@@ -61,7 +63,7 @@ class CoreClient extends Client {
    * @param {Transport} transport
    */
   constructor (transport) {
-    super('core', ['add', 'addAll', 'cat'], transport)
+    super('core', ['add', 'addAll', 'cat', 'ls'], transport)
   }
 
   /**
@@ -174,6 +176,24 @@ class CoreClient extends Client {
     const result = await this.remote.cat({ ...options, path: input })
     yield * decodeIterable(result.data, identity)
   }
+
+  /**
+   * Returns content addressed by a valid IPFS Path.
+   *
+   * @param {string|CID} inputPath
+   * @param {Object} [options]
+   * @param {boolean} [options.recursive]
+   * @param {boolean} [options.preload]
+   * @param {number} [options.timeout]
+   * @param {AbortSignal} [options.signal]
+   * @returns {AsyncIterable<LsEntry>}
+   */
+  async * ls (inputPath, options = {}) {
+    const input = CID.isCID(inputPath) ? encodeCID(inputPath) : inputPath
+    const result = await this.remote.ls({ ...options, path: input })
+
+    yield * decodeIterable(result.data, decodeLsEntry)
+  }
 }
 
 /**
@@ -192,6 +212,21 @@ const decodeAddedData = ({ path, cid, mode, mtime, size }) => {
   }
 }
 
+/**
+ * @param {EncodedLsEntry} encodedEntry
+ * @returns {LsEntry}
+ */
+const decodeLsEntry = ({ depth, name, path, size, cid, type, mode, mtime }) => ({
+  cid: decodeCID(cid),
+  type,
+  name,
+  path,
+  mode,
+  mtime,
+  size,
+  depth
+})
+
 /**
  * @template T
  * @param {T} v
@@ -359,7 +394,7 @@ const encodeFileObject = ({ path, mode, mtime, content }, transfer) => {
 
 /**
  *
- * @param {FileContent} [content]
+ * @param {FileContent|undefined} content
  * @param {Transferable[]} transfer
  * @returns {EncodedFileContent}
  */
diff --git a/packages/ipfs-message-port-client/test/interface-message-port-client.js b/packages/ipfs-message-port-client/test/interface-message-port-client.js
index 225be17085..9381c955dd 100644
--- a/packages/ipfs-message-port-client/test/interface-message-port-client.js
+++ b/packages/ipfs-message-port-client/test/interface-message-port-client.js
@@ -74,10 +74,6 @@ describe('interface-ipfs-core tests', () => {
         name: 'get',
         reason: 'Not implemented'
       },
-      {
-        name: 'ls',
-        reason: 'Not implemented'
-      },
       {
         name: 'refs',
         reason: 'Not implemented'
diff --git a/packages/ipfs-message-port-server/src/core.js b/packages/ipfs-message-port-server/src/core.js
index b18a78ecef..da7952b415 100644
--- a/packages/ipfs-message-port-server/src/core.js
+++ b/packages/ipfs-message-port-server/src/core.js
@@ -21,6 +21,7 @@ const { decodeCID, encodeCID } = require('ipfs-message-port-protocol/src/cid')
  * @typedef {import('./ipfs').FileObject} FileObject
  * @typedef {import('./ipfs').FileContent} DecodedFileContent
  * @typedef {import('./ipfs').FileInput} DecodedFileInput
+ * @typedef {import('./ipfs').LsEntry} LsEntry
  */
 
 /**
@@ -95,17 +96,15 @@ const { decodeCID, encodeCID } = require('ipfs-message-port-protocol/src/cid')
  * @typedef {Object} LsQuery
  * @property {string} path
  *
- * @typedef {RemoteIterable<LsEntry>} LsResult
- *
- * @typedef {Object} LsEntry
- * @property {number} depth
+ * @typedef {Object} EncodedLsEntry
+ * @property {EncodedCID} cid
+ * @property {FileType} type
  * @property {string} name
  * @property {string} path
+ * @property {number} depth
  * @property {number} size
- * @property {EncodedCID} cid
- * @property {FileType} type
- * @property {Mode} mode
- * @property {UnixFSTime} mtime
+ * @property {Mode} [mode]
+ * @property {UnixFSTime} [mtime]
  */
 
 /**
@@ -231,6 +230,26 @@ class CoreService {
     const content = this.ipfs.cat(location, { offset, length, timeout, signal })
     return encodeCatResult(content)
   }
+
+  /**
+   * @typedef {Object} LsResult
+   * @property {RemoteIterable<EncodedLsEntry>} data
+   * @property {Transferable[]} transfer
+   *
+   * @param {Object} query
+   * @param {string|EncodedCID} query.path
+   * @param {boolean} [query.preload]
+   * @param {boolean} [query.recursive]
+   * @param {number} [query.timeout]
+   * @param {AbortSignal} [query.signal]
+   * @returns {LsResult}
+   */
+  ls (query) {
+    const { path, recursive, preload, timeout, signal } = query
+    const location = typeof path === 'string' ? path : decodeCID(path)
+    const entries = this.ipfs.ls(location, { recursive, preload, timeout, signal })
+    return encodeLsResult(entries)
+  }
 }
 // @returns {string|ArrayBufferView|ArrayBuffer|Blob|AsyncIterable<string>|AsyncIterable<ArrayBufferView>|AsyncIterable<ArrayBuffer>|AsyncIterable<Blob>|AsyncIterable<FileObject>}
 
@@ -334,6 +353,33 @@ const encodeCatResult = content => {
   return { data: encodeIterable(content, moveBuffer, transfer), transfer }
 }
 
+/**
+ *
+ * @param {AsyncIterable<LsEntry>} entries
+ * @returns {LsResult}
+ */
+const encodeLsResult = entries => {
+  /** @type {Transferable[]} */
+  const transfer = []
+  return { data: encodeIterable(entries, encodeLsEntry, transfer), transfer }
+}
+
+/**
+ *
+ * @param {LsEntry} entry
+ * @returns {EncodedLsEntry}
+ */
+const encodeLsEntry = ({ depth, name, path, size, cid, type, mode, mtime }) => ({
+  cid: encodeCID(cid),
+  type,
+  name,
+  path,
+  mode,
+  mtime,
+  size,
+  depth
+})
+
 /**
  * Adds underlying `ArrayBuffer` to the transfer list.
  *
diff --git a/packages/ipfs-message-port-server/src/ipfs.ts b/packages/ipfs-message-port-server/src/ipfs.ts
index ce62969bd6..f8538553a6 100644
--- a/packages/ipfs-message-port-server/src/ipfs.ts
+++ b/packages/ipfs-message-port-server/src/ipfs.ts
@@ -59,6 +59,8 @@ export interface Core {
   addAll(inputs: AddAllInput, options: AddOptions): AsyncIterable<FileOutput>
   add(input: AddInput, options: AddOptions): Promise<FileOutput>
   cat(ipfsPath: CID | string, options: CatOptions): AsyncIterable<Buffer>
+
+  ls(ipfsPath: CID | string, options: CoreLsOptions): AsyncIterable<LsEntry>
 }
 
 interface AddOptions extends AbortOptions {
@@ -95,6 +97,11 @@ interface CatOptions extends AbortOptions {
   length?: number
 }
 
+interface CoreLsOptions extends AbortOptions {
+  preload?: boolean
+  recursive?: boolean
+}
+
 export interface Files {
   chmod(path: string | CID, mode: Mode, options?: ChmodOptions): Promise<void>
 
@@ -120,13 +127,15 @@ interface LsOptions extends AbortOptions {
   sort?: boolean
 }
 
-type LsEntry = {
+export type LsEntry = {
   name: string
+  path: string
   type: FileType
   size: number
+  depth: number
   cid: CID
   mode: Mode
-  mtime: UnixFSTime
+  mtime?: UnixFSTime
 }
 
 interface StatOptions extends AbortOptions {