diff --git a/docs/changelog.md b/docs/changelog.md
index 4a2a68ab..c21eec25 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -11,6 +11,9 @@ Requires libvips v8.13.0
 * Use combined bounding box of alpha and non-alpha channels for `trim` operation.
   [#2166](https://github.com/lovell/sharp/issues/2166)
 
+* Add input `fileSuffix` and output `alias` to `format` information.
+  [#2642](https://github.com/lovell/sharp/issues/2642)
+
 * Re-introduce support for greyscale ICC profiles (temporarily removed in 0.30.2).
   [#3114](https://github.com/lovell/sharp/issues/3114)
 
diff --git a/lib/output.js b/lib/output.js
index edbed12d..6f46ce6c 100644
--- a/lib/output.js
+++ b/lib/output.js
@@ -10,6 +10,9 @@ const formats = new Map([
   ['avif', 'avif'],
   ['jpeg', 'jpeg'],
   ['jpg', 'jpeg'],
+  ['jpe', 'jpeg'],
+  ['tile', 'tile'],
+  ['dz', 'tile'],
   ['png', 'png'],
   ['raw', 'raw'],
   ['tiff', 'tiff'],
diff --git a/lib/utility.js b/lib/utility.js
index 4c7f95cd..782f30ba 100644
--- a/lib/utility.js
+++ b/lib/utility.js
@@ -17,6 +17,10 @@ const sharp = require('./sharp');
  * @returns {Object}
  */
 const format = sharp.format();
+format.heif.output.alias = ['avif', 'heic'];
+format.jpeg.output.alias = ['jpe', 'jpg'];
+format.tiff.output.alias = ['tif'];
+format.jp2k.output.alias = ['j2c', 'j2k', 'jp2', 'jpx'];
 
 /**
  * An Object containing the available interpolators and their proper values
diff --git a/src/utilities.cc b/src/utilities.cc
index 37c1cefd..f40a543a 100644
--- a/src/utilities.cc
+++ b/src/utilities.cc
@@ -118,14 +118,22 @@ Napi::Value format(const Napi::CallbackInfo& info) {
     "ppm", "fits", "gif", "svg", "heif", "pdf", "vips", "jp2k"
   }) {
     // Input
-    Napi::Boolean hasInputFile =
-      Napi::Boolean::New(env, vips_type_find("VipsOperation", (f + "load").c_str()));
+    const VipsObjectClass *oc = vips_class_find("VipsOperation", (f + "load").c_str());
+    Napi::Boolean hasInputFile = Napi::Boolean::New(env, oc);
     Napi::Boolean hasInputBuffer =
       Napi::Boolean::New(env, vips_type_find("VipsOperation", (f + "load_buffer").c_str()));
     Napi::Object input = Napi::Object::New(env);
     input.Set("file", hasInputFile);
     input.Set("buffer", hasInputBuffer);
     input.Set("stream", hasInputBuffer);
+    if (hasInputFile) {
+      Napi::Array fileSuffix = Napi::Array::New(env);
+      const char **suffix = VIPS_FOREIGN_CLASS(oc)->suffs;
+      for (int i = 0; *suffix; i++, suffix++) {
+        fileSuffix.Set(i, Napi::String::New(env, *suffix));
+      }
+      input.Set("fileSuffix", fileSuffix);
+    }
     // Output
     Napi::Boolean hasOutputFile =
       Napi::Boolean::New(env, vips_type_find("VipsOperation", (f + "save").c_str()));
diff --git a/test/unit/util.js b/test/unit/util.js
index 23ba2b59..f9dda22c 100644
--- a/test/unit/util.js
+++ b/test/unit/util.js
@@ -102,7 +102,7 @@ describe('Utilities', function () {
         ['input', 'output'].forEach(function (direction) {
           assert.strictEqual(true, direction in sharp.format[format]);
           assert.strictEqual('object', typeof sharp.format[format][direction]);
-          assert.strictEqual(3, Object.keys(sharp.format[format][direction]).length);
+          assert.strictEqual(true, [3, 4].includes(Object.keys(sharp.format[format][direction]).length));
           assert.strictEqual(true, 'file' in sharp.format[format][direction]);
           assert.strictEqual(true, 'buffer' in sharp.format[format][direction]);
           assert.strictEqual(true, 'stream' in sharp.format[format][direction]);
@@ -126,6 +126,12 @@ describe('Utilities', function () {
         assert.strictEqual(false, sharp.format.vips[direction].stream);
       });
     });
+    it('input fileSuffix', function () {
+      assert.deepStrictEqual(['.jpg', '.jpeg', '.jpe'], sharp.format.jpeg.input.fileSuffix);
+    });
+    it('output alias', function () {
+      assert.deepStrictEqual(['jpe', 'jpg'], sharp.format.jpeg.output.alias);
+    });
   });
 
   describe('Versions', function () {