diff --git a/packages/__tests__/index.js b/packages/__tests__/index.js
new file mode 100644
index 00000000..bd63458b
--- /dev/null
+++ b/packages/__tests__/index.js
@@ -0,0 +1,107 @@
+import S3v3 from '@aws-sdk/client-s3';
+import { FsAwsS3 } from '@chunkd/source-aws';
+import { S3LikeV3 } from '@chunkd/source-aws-v3';
+import { FsGoogleStorage } from '@chunkd/source-google-cloud';
+import { Storage } from '@google-cloud/storage';
+import S3 from 'aws-sdk/clients/s3.js';
+import o from 'ospec';
+import { fsa } from '../fs/build/index.node.js';
+
+fsa.register(`s3://blacha-chunkd-test/v2`, new FsAwsS3(new S3()));
+fsa.register(`s3://blacha-chunkd-test/v3`, new FsAwsS3(new S3LikeV3(new S3v3.S3())));
+fsa.register(`gs://blacha-chunkd-test/`, new FsGoogleStorage(new Storage()));
+
+const TestFiles = [
+  { path: 'a/b/file-a-b-1.txt', buffer: Buffer.from('a/b/file-a-b-1.txt') },
+  { path: 'a/b/file-a-b-2', buffer: Buffer.from('a/b/file-a-b-2') },
+  { path: 'a/file-a-1', buffer: Buffer.from('file-a-1') },
+  { path: 'c/file-c-1', buffer: Buffer.from('file-c-1') },
+  { path: 'd/file-d-1', buffer: Buffer.from('file-d-1') },
+  { path: 'file-1', buffer: Buffer.from('file-1') },
+  { path: 'file-2', buffer: Buffer.from('file-2') },
+  { path: '🦄.json', buffer: Buffer.from('🦄') },
+];
+
+async function setupTestData(prefix) {
+  try {
+    const existing = await fsa.toArray(fsa.list(prefix));
+    if (existing.length === TestFiles.length) return;
+  } catch (e) {
+    //noop
+  }
+  for (const file of TestFiles) {
+    const target = fsa.join(prefix, file.path);
+    console.log(target);
+    await fsa.write(target, file.buffer);
+  }
+}
+
+function removeSlashes(f) {
+  if (f.startsWith('/')) f = f.slice(1);
+  if (f.endsWith('/')) f = f.slice(0, f.length - 1);
+  return f;
+}
+
+function testPrefix(prefix) {
+  o.spec(prefix, () => {
+    o.specTimeout(5000);
+    o.before(async () => {
+      await setupTestData(prefix);
+    });
+
+    o('should list recursive:default ', async () => {
+      const files = await fsa.toArray(fsa.list(prefix));
+      o(files.length).equals(TestFiles.length);
+    });
+
+    o('should list recursive:true ', async () => {
+      const files = await fsa.toArray(fsa.list(prefix, { recursive: true }));
+      o(files.length).equals(TestFiles.length);
+
+      for (const file of TestFiles) {
+        o(files.find((f) => f.endsWith(file.path))).notEquals(undefined);
+      }
+    });
+
+    o('should list recursive:false ', async () => {
+      const files = await fsa.toArray(fsa.list(prefix, { recursive: false }));
+      o(files.length).equals(6);
+      o(files.map((f) => f.slice(prefix.length)).map(removeSlashes)).deepEquals([
+        'a',
+        'c',
+        'd',
+        'file-1',
+        'file-2',
+        '🦄.json',
+      ]);
+    });
+
+    o('should list folders', async () => {
+      const files = await fsa.toArray(fsa.details(prefix, { recursive: false }));
+      o(
+        files
+          .filter((f) => f.isDirectory)
+          .map((f) => f.path.slice(prefix.length))
+          .map(removeSlashes),
+      ).deepEquals(['a', 'c', 'd']);
+    });
+
+    o('should read a file', async () => {
+      const file = await fsa.read(fsa.join(prefix, TestFiles[0].path));
+      o(file.toString()).equals(TestFiles[0].buffer.toString());
+    });
+
+    o('should head a file', async () => {
+      const ret = await fsa.head(fsa.join(prefix, TestFiles[0].path));
+      o(ret.path).equals(fsa.join(prefix, TestFiles[0].path));
+      o(ret.size).equals(TestFiles[0].buffer.length);
+    });
+  });
+}
+
+testPrefix('/tmp/blacha-chunkd-test/');
+// testPrefix('s3://blacha-chunkd-test/v2/');
+// testPrefix('s3://blacha-chunkd-test/v3/');
+// testPrefix('gs://blacha-chunkd-test/');
+
+o.run();
diff --git a/packages/core/src/fs.ts b/packages/core/src/fs.ts
index fbbbdc02..b8c6bd6a 100644
--- a/packages/core/src/fs.ts
+++ b/packages/core/src/fs.ts
@@ -9,6 +9,9 @@ export interface FileInfo {
    * undefined if no size found
    */
   size?: number;
+
+  /** Is this file a directory */
+  isDirectory?: boolean;
 }
 
 export interface WriteOptions {
@@ -18,6 +21,14 @@ export interface WriteOptions {
   contentType?: string;
 }
 
+export interface ListOptions {
+  /**
+   * List recursively
+   * @default true
+   */
+  recursive?: boolean;
+}
+
 export interface FileSystem<T extends ChunkSource = ChunkSource> {
   /**
    * Protocol used for communication
@@ -33,12 +44,10 @@ export interface FileSystem<T extends ChunkSource = ChunkSource> {
   stream(filePath: string): Readable;
   /** Write a file from either a buffer or stream */
   write(filePath: string, buffer: Buffer | Readable | string, opts?: Partial<WriteOptions>): Promise<void>;
-  /** Recursively list all files in path */
-  list(filePath: string): AsyncGenerator<string>;
-  /** Recursively list all files in path with additional details */
-  details(filePath: string): AsyncGenerator<FileInfo>;
-  /** Does the path exists */
-  exists(filePath: string): Promise<boolean>;
+  /** list all files in path */
+  list(filePath: string, opt?: ListOptions): AsyncGenerator<string>;
+  /** list all files with file info in path */
+  details(filePath: string, opt?: ListOptions): AsyncGenerator<FileInfo>;
   /** Get information about the path  */
   head(filePath: string): Promise<FileInfo | null>;
   /** Create a file source to read chunks out of */
diff --git a/packages/core/src/index.ts b/packages/core/src/index.ts
index 3fa8b7bb..c6ff119b 100644
--- a/packages/core/src/index.ts
+++ b/packages/core/src/index.ts
@@ -3,7 +3,7 @@ export { ChunkSourceBase } from './chunk.source.js';
 export { SourceMemory } from './chunk.source.memory.js';
 export { ChunkSource } from './source.js';
 export { ErrorCodes, CompositeError } from './composite.js';
-export { FileSystem, FileInfo, WriteOptions } from './fs.js';
+export { FileSystem, FileInfo, WriteOptions, ListOptions } from './fs.js';
 
 export function isRecord<T = unknown>(value: unknown): value is Record<string, T> {
   return typeof value === 'object' && value !== null;
diff --git a/packages/fs/src/fs.abstraction.ts b/packages/fs/src/fs.abstraction.ts
index 9bc1bb9e..f125aebf 100644
--- a/packages/fs/src/fs.abstraction.ts
+++ b/packages/fs/src/fs.abstraction.ts
@@ -1,5 +1,6 @@
 import type { Readable } from 'stream';
 import { ChunkSource, FileInfo, FileSystem, WriteOptions } from '@chunkd/core';
+import { ListOptions } from '@chunkd/core';
 
 export type FileWriteTypes = Buffer | Readable | string | Record<string, unknown> | Array<unknown>;
 
@@ -96,8 +97,8 @@ export class FileSystemAbstraction implements FileSystem {
    * @param filePath file path to search
    * @returns list of files inside that path
    */
-  list(filePath: string): AsyncGenerator<string> {
-    return this.get(filePath).list(filePath);
+  list(filePath: string, opts?: ListOptions): AsyncGenerator<string> {
+    return this.get(filePath).list(filePath, opts);
   }
 
   /**
@@ -107,8 +108,8 @@ export class FileSystemAbstraction implements FileSystem {
    * @param filePath file path to search
    * @returns list of files inside that path
    */
-  details(filePath: string): AsyncGenerator<FileInfo> {
-    return this.get(filePath).details(filePath);
+  details(filePath: string, opts?: ListOptions): AsyncGenerator<FileInfo> {
+    return this.get(filePath).details(filePath, opts);
   }
 
   /**
@@ -118,7 +119,9 @@ export class FileSystemAbstraction implements FileSystem {
    * @returns true if file exists, false otherwise
    */
   exists(filePath: string): Promise<boolean> {
-    return this.get(filePath).exists(filePath);
+    return this.get(filePath)
+      .head(filePath)
+      .then((f) => f != null);
   }
 
   /**
@@ -168,3 +171,17 @@ export class FileSystemAbstraction implements FileSystem {
 }
 
 export const fsa = new FileSystemAbstraction();
+
+// async function main(): Promise<void> {
+//   for await (const f of fsa.list('')) {
+//     console.log(f);
+//   }
+
+//   for await (const f of fsa.list('', { details: true })) {
+//     console.log(f.path);
+//   }
+
+//   for await (const f of fsa.list('', { details: false, recursive: false })) {
+//     console.log(f.path);
+//   }
+// }
diff --git a/packages/source-aws/src/__test__/s3.fs.test.ts b/packages/source-aws/src/__test__/s3.fs.test.ts
index 46c1885f..090da36a 100644
--- a/packages/source-aws/src/__test__/s3.fs.test.ts
+++ b/packages/source-aws/src/__test__/s3.fs.test.ts
@@ -78,9 +78,14 @@ o.spec('file.s3', () => {
       ]);
       o(stub.callCount).equals(5);
       const [firstCall] = stub.args[0] as any;
-      o(firstCall).deepEquals({ Bucket: 'bucket', Prefix: undefined, ContinuationToken: undefined });
+      o(firstCall).deepEquals({
+        Bucket: 'bucket',
+        Prefix: undefined,
+        ContinuationToken: undefined,
+        Delimiter: undefined,
+      });
       const [secondCall] = stub.args[1] as any;
-      o(secondCall).deepEquals({ Bucket: 'bucket', Prefix: undefined, ContinuationToken: 1 });
+      o(secondCall).deepEquals({ Bucket: 'bucket', Prefix: undefined, ContinuationToken: 1, Delimiter: undefined });
     });
 
     o('should allow listing of bucket', async () => {
@@ -94,7 +99,12 @@ o.spec('file.s3', () => {
       o(data).deepEquals(['s3://bucket/FirstFile']);
       o(stub.callCount).equals(1);
       const [firstCall] = stub.args[0] as any;
-      o(firstCall).deepEquals({ Bucket: 'bucket', Prefix: undefined, ContinuationToken: undefined });
+      o(firstCall).deepEquals({
+        Bucket: 'bucket',
+        Prefix: undefined,
+        ContinuationToken: undefined,
+        Delimiter: undefined,
+      });
     });
 
     o('should allow listing of bucket with prefix', async () => {
@@ -108,7 +118,7 @@ o.spec('file.s3', () => {
       o(data).deepEquals(['s3://bucket/keyFirstFile']);
       o(stub.callCount).equals(1);
       const [firstCall] = stub.args[0] as any;
-      o(firstCall).deepEquals({ Bucket: 'bucket', Prefix: 'key', ContinuationToken: undefined });
+      o(firstCall).deepEquals({ Bucket: 'bucket', Prefix: 'key', ContinuationToken: undefined, Delimiter: undefined });
     });
   });
 
diff --git a/packages/source-aws/src/s3.fs.ts b/packages/source-aws/src/s3.fs.ts
index 6a1411f8..bacb70d3 100644
--- a/packages/source-aws/src/s3.fs.ts
+++ b/packages/source-aws/src/s3.fs.ts
@@ -1,4 +1,4 @@
-import { FileInfo, FileSystem, isRecord, parseUri, WriteOptions } from '@chunkd/core';
+import { FileInfo, FileSystem, isRecord, ListOptions, parseUri, WriteOptions } from '@chunkd/core';
 import type { Readable } from 'stream';
 import { getCompositeError, SourceAwsS3 } from './s3.source.js';
 import { ListRes, S3Like, toPromise } from './type.js';
@@ -35,29 +35,36 @@ export class FsAwsS3 implements FileSystem<SourceAwsS3> {
 
   /** Parse a s3:// URI into the bucket and key components */
 
-  async *list(filePath: string): AsyncGenerator<string> {
-    for await (const obj of this.details(filePath)) yield obj.path;
+  async *list(filePath: string, opts?: ListOptions): AsyncGenerator<string> {
+    for await (const obj of this.details(filePath, opts)) yield obj.path;
   }
 
-  async *details(filePath: string): AsyncGenerator<FileInfo> {
-    const opts = parseUri(filePath);
-    if (opts == null) return;
+  async *details(filePath: string, opts?: ListOptions): AsyncGenerator<FileInfo> {
+    const loc = parseUri(filePath);
+    if (loc == null) return;
     let ContinuationToken: string | undefined = undefined;
-    const Bucket = opts.bucket;
-    const Prefix = opts.key;
+    const Delimiter: string | undefined = opts?.recursive === false ? '/' : undefined;
+    const Bucket = loc.bucket;
+    const Prefix = loc.key;
 
     let count = 0;
     try {
       while (true) {
         count++;
-        const res: ListRes = await toPromise(this.s3.listObjectsV2({ Bucket, Prefix, ContinuationToken }));
+        const res: ListRes = await toPromise(this.s3.listObjectsV2({ Bucket, Prefix, ContinuationToken, Delimiter }));
 
-        // Failed to get any content abort
-        if (res.Contents == null) break;
+        if (res.CommonPrefixes != null) {
+          for (const prefix of res.CommonPrefixes) {
+            if (prefix.Prefix == null) continue;
+            yield { path: `s3://${Bucket}/${prefix.Prefix}`, isDirectory: true };
+          }
+        }
 
-        for (const obj of res.Contents) {
-          if (obj.Key == null) continue;
-          yield { path: `s3://${Bucket}/${obj.Key}`, size: obj.Size };
+        if (res.Contents != null) {
+          for (const obj of res.Contents) {
+            if (obj.Key == null) continue;
+            yield { path: `s3://${Bucket}/${obj.Key}`, size: obj.Size };
+          }
         }
 
         // Nothing left to fetch
diff --git a/packages/source-aws/src/type.ts b/packages/source-aws/src/type.ts
index 3f8b4033..6ff94dfb 100644
--- a/packages/source-aws/src/type.ts
+++ b/packages/source-aws/src/type.ts
@@ -21,12 +21,13 @@ export type UploadReq = Location & {
 };
 export type UploadRes = unknown;
 
-export type ListReq = { Bucket: string; Prefix?: string; ContinuationToken?: string };
+export type ListReq = { Bucket: string; Prefix?: string; ContinuationToken?: string; Delimiter?: string };
 export type ListResContents = { Key?: string; Size?: number };
 export type ListRes = {
   IsTruncated?: boolean;
   NextContinuationToken?: string;
   Contents?: ListResContents[];
+  CommonPrefixes?: { Prefix?: string }[];
 };
 
 export type HeadReq = Location;
diff --git a/packages/source-file/src/__test__/fs.file.test.ts b/packages/source-file/src/__test__/fs.file.test.ts
new file mode 100644
index 00000000..6d08eb3e
--- /dev/null
+++ b/packages/source-file/src/__test__/fs.file.test.ts
@@ -0,0 +1,65 @@
+/* eslint-disable @typescript-eslint/no-non-null-assertion */
+import o from 'ospec';
+import path from 'path';
+import 'source-map-support/register.js';
+import { fileURLToPath } from 'url';
+import { FsFile } from '../file.fs.js';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+
+async function toArray<T>(generator: AsyncGenerator<T>): Promise<T[]> {
+  const output: T[] = [];
+  for await (const o of generator) output.push(o);
+  return output;
+}
+
+o.spec('LocalFileSystem', () => {
+  const fs = new FsFile();
+
+  o('should read a file', async () => {
+    const buf = await fs.read(path.join(__dirname, 'fs.file.test.js'));
+    o(buf.toString().includes("import o from 'ospec'")).equals(true);
+  });
+
+  o('should 404 when file not found', async () => {
+    try {
+      await fs.read(path.join(__dirname, 'NOT A FILE.js'));
+      o(true).equals(false); // should have errored
+    } catch (e: any) {
+      o(e.code).equals(404);
+    }
+  });
+
+  o('should head/exists a file', async () => {
+    const ref = await fs.head(path.join(__dirname, 'fs.file.test.js'));
+    o(ref).notEquals(null);
+  });
+
+  o('should list files', async () => {
+    const files = await toArray(fs.list(__dirname));
+
+    o(files.length > 3).equals(true);
+    o(files.find((f) => f.endsWith('__test__/fs.file.test.js'))).notEquals(undefined);
+  });
+
+  o('should list files with details', async () => {
+    const files = await toArray(fs.details(__dirname));
+
+    o(files.length > 3).equals(true);
+    o(files.find((f) => f.path.endsWith('__test__/fs.file.test.js'))).notEquals(undefined);
+    o(files.filter((f) => f.isDirectory)).deepEquals([]);
+  });
+
+  o('should list recursively', async () => {
+    const files = await toArray(fs.details(path.join(__dirname, '..')));
+    o(files.find((f) => f.path.endsWith('__test__/fs.file.test.js'))).notEquals(undefined);
+    o(files.filter((f) => f.isDirectory)).deepEquals([]);
+  });
+
+  o('should list folders when not recursive', async () => {
+    const files = await toArray(fs.details(path.join(__dirname, '..'), { recursive: false }));
+    // In a sub folder shouldn't find it
+    o(files.find((f) => f.path.endsWith('__test__/fs.file.test.js'))).equals(undefined);
+    o(files.filter((f) => f.isDirectory).length).deepEquals(1);
+  });
+});
diff --git a/packages/source-file/src/file.fs.ts b/packages/source-file/src/file.fs.ts
index 9203806f..bf20035d 100644
--- a/packages/source-file/src/file.fs.ts
+++ b/packages/source-file/src/file.fs.ts
@@ -1,7 +1,7 @@
 import fs from 'fs';
 import path from 'path';
 import { Readable } from 'stream';
-import { CompositeError, FileInfo, FileSystem, isRecord } from '@chunkd/core';
+import { CompositeError, FileInfo, FileSystem, isRecord, ListOptions } from '@chunkd/core';
 import { SourceFile } from './file.source.js';
 
 export type FsError = { code: string } & Error;
@@ -24,13 +24,13 @@ export class FsFile implements FileSystem<SourceFile> {
     return new SourceFile(filePath);
   }
 
-  async *list(filePath: string): AsyncGenerator<string> {
+  async *list(filePath: string, opts?: ListOptions): AsyncGenerator<string> {
     try {
       const files = await fs.promises.readdir(filePath, { withFileTypes: true });
       const resolve = path.resolve(filePath);
       for (const file of files) {
         const targetPath = path.join(resolve, file.name);
-        if (file.isDirectory()) yield* this.list(targetPath);
+        if (file.isDirectory() && opts?.recursive !== false) yield* this.list(targetPath);
         else yield targetPath;
       }
     } catch (e) {
@@ -38,8 +38,8 @@ export class FsFile implements FileSystem<SourceFile> {
     }
   }
 
-  async *details(filePath: string): AsyncGenerator<FileInfo> {
-    for await (const file of this.list(filePath)) {
+  async *details(filePath: string, opts?: ListOptions): AsyncGenerator<FileInfo & { isDirectory: boolean }> {
+    for await (const file of this.list(filePath, opts)) {
       const res = await this.head(file);
       if (res == null) continue;
       yield res;
@@ -64,10 +64,6 @@ export class FsFile implements FileSystem<SourceFile> {
     }
   }
 
-  exists(filePath: string): Promise<boolean> {
-    return this.head(filePath).then((f) => f != null);
-  }
-
   async write(filePath: string, buf: Buffer | Readable | string): Promise<void> {
     const folderPath = path.dirname(filePath);
     await fs.promises.mkdir(folderPath, { recursive: true });
diff --git a/packages/source-google-cloud/src/gcp.fs.ts b/packages/source-google-cloud/src/gcp.fs.ts
index f2f76f32..236218dd 100644
--- a/packages/source-google-cloud/src/gcp.fs.ts
+++ b/packages/source-google-cloud/src/gcp.fs.ts
@@ -1,4 +1,4 @@
-import { FileInfo, FileSystem, isRecord, parseUri, WriteOptions } from '@chunkd/core';
+import { FileInfo, FileSystem, isRecord, ListOptions, parseUri, WriteOptions } from '@chunkd/core';
 import { Storage } from '@google-cloud/storage';
 import { Readable } from 'stream';
 import { SourceGoogleStorage } from './gcp.source.js';
@@ -42,25 +42,28 @@ export class FsGoogleStorage implements FileSystem<SourceGoogleStorage> {
   static parse = parseUri;
   parse = parseUri;
 
-  async *list(filePath: string): AsyncGenerator<string> {
-    for await (const obj of this.details(filePath)) yield obj.path;
+  async *list(filePath: string, opts?: ListOptions): AsyncGenerator<string> {
+    for await (const obj of this.details(filePath, opts)) yield obj.path;
   }
 
-  async *details(filePath: string): AsyncGenerator<FileInfo> {
-    const opts = this.parse(filePath);
-    if (opts == null) throw new Error(`GoogleStorage: Failed to list: "${filePath}"`);
+  async *details(filePath: string, opts?: ListOptions): AsyncGenerator<FileInfo> {
+    const loc = this.parse(filePath);
+    if (loc == null) throw new Error(`GoogleStorage: Failed to list: "${filePath}"`);
 
-    const bucket = this.storage.bucket(opts.bucket);
-    const [files, , metadata] = await bucket.getFiles({ prefix: opts.key, autoPaginate: false, delimiter: '/' });
+    const bucket = this.storage.bucket(loc.bucket);
+    const [files, , metadata] = await bucket.getFiles({ prefix: loc.key, autoPaginate: false, delimiter: '/' });
     if (files != null && files.length > 0) {
       for (const file of files) {
-        yield { path: join(`gs://${opts.bucket}`, file.name), size: Number(file.metadata.size) };
+        yield { path: join(`gs://${loc.bucket}`, file.name), size: Number(file.metadata.size) };
       }
     }
 
     // Recurse down
     if (metadata != null && metadata.prefixes != null) {
-      for (const prefix of metadata.prefixes) yield* this.details(join(`gs://${opts.bucket}`, prefix));
+      for (const prefix of metadata.prefixes) {
+        if (opts?.recursive !== false) yield* this.details(join(`gs://${loc.bucket}`, prefix), opts);
+        else yield { path: join(`gs://${loc.bucket}`, prefix), isDirectory: true };
+      }
     }
   }
 
diff --git a/packages/source-http/src/http.fs.ts b/packages/source-http/src/http.fs.ts
index 27838bc4..7ae04e15 100644
--- a/packages/source-http/src/http.fs.ts
+++ b/packages/source-http/src/http.fs.ts
@@ -25,7 +25,6 @@ export class FsHttp implements FileSystem<SourceHttp> {
   async *list(filePath: string): AsyncGenerator<string> {
     throw new Error(`Unable to "list" on ${filePath}`);
   }
-
   async *details(filePath: string): AsyncGenerator<FileInfo> {
     throw new Error(`Unable to "details" on ${filePath}`);
   }
@@ -42,21 +41,11 @@ export class FsHttp implements FileSystem<SourceHttp> {
     return Buffer.from(await res.arrayBuffer());
   }
 
-  exists(filePath: string): Promise<boolean> {
-    return this.head(filePath).then((f) => f != null);
-  }
-
   async write(filePath: string): Promise<void> {
     throw new Error(`Unable to "write" on ${filePath}`);
   }
 
   stream(filePath: string): Readable {
     throw new Error(`Unable to "stream" on ${filePath}`);
-
-    // TODO
-    // const res = await SourceHttp.fetch(filePath, { method: 'HEAD' });
-    // if (!res.ok || res.body == null) throw getCompositeError(new Error(res.statusText), `Failed to head: ${filePath}`);
-
-    // return res.body as unknown as Readable;
   }
 }