diff --git a/index.d.ts b/index.d.ts
index 1099dc21..cc837705 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -3,36 +3,49 @@
 declare namespace sortPackageJsonExports {
   interface SortPackageJsonFn {
     /**
-      * Sort packageJson object.
-      *
-      * @param packageJson - A packageJson
-      * @param options
-      * @returns Sorted packageJson object
-      */
-    <T extends Record<any, any>>(packageJson: T, options?: Options): T,
+     * Sort packageJson object.
+     *
+     * @param packageJson - A packageJson
+     * @param options
+     * @returns Sorted packageJson object
+     */
+    <T extends Record<any, any>>(packageJson: T, options?: Options): T
 
     /**
-      * Sort packageJson string.
-      *
-      * @param packageJson - A packageJson string.
-      * @param options
-      * @returns Sorted packageJson string.
-      */
-    (packageJson: string, options?: Options): string,
+     * Sort packageJson string.
+     *
+     * @param packageJson - A packageJson string.
+     * @param options
+     * @returns Sorted packageJson string.
+     */
+    (packageJson: string, options?: Options): string
   }
 
-  type ComparatorFunction = (left: string, right: string) => number;
+  type ComparatorFunction = (left: string, right: string) => number
+  function sortObjectBy<T extends Record<any, any>>(
+    comparator: ComparatorFunction,
+    deep: boolean,
+  ): (x: T) => T
+
+  interface Field {
+    readonly key: string
+    readonly over: sortObjectBy
+  }
 
   interface Options {
-    readonly sortOrder?: readonly string[] | ComparatorFunction;
+    readonly sortOrder?: readonly string[] | ComparatorFunction
+    readonly fields?: Field[]
   }
 }
 
-interface sortPackageJsonExports extends sortPackageJsonExports.SortPackageJsonFn {
-  readonly default: sortPackageJsonExports.SortPackageJsonFn;
-  readonly sortPackageJson: sortPackageJsonExports.SortPackageJsonFn;
+interface sortPackageJsonExports
+  extends sortPackageJsonExports.SortPackageJsonFn {
+  readonly default: sortPackageJsonExports.SortPackageJsonFn
+  readonly sortPackageJson: sortPackageJsonExports.SortPackageJsonFn
+  readonly sortOrder: string[]
+  readonly sortObjectBy: sortPackageJsonExports.sortObjectBy
 }
 
-declare const sortPackageJsonExports: sortPackageJsonExports;
+declare const sortPackageJsonExports: sortPackageJsonExports
 
-export = sortPackageJsonExports;
+export = sortPackageJsonExports
diff --git a/index.js b/index.js
index a361b034..c6c924c2 100755
--- a/index.js
+++ b/index.js
@@ -280,14 +280,15 @@ const fields = [
 ]
 
 const defaultSortOrder = fields.map(({ key }) => key)
-const overFields = pipe(
-  fields.reduce((fns, { key, over }) => {
-    if (over) {
-      fns.push(overProperty(key, over))
-    }
-    return fns
-  }, []),
-)
+const overFields = (fields) =>
+  pipe(
+    fields.reduce((fns, { key, over }) => {
+      if (over) {
+        fns.push(overProperty(key, over))
+      }
+      return fns
+    }, []),
+  )
 
 function editStringJSON(json, over) {
   if (typeof json === 'string') {
@@ -332,7 +333,16 @@ function sortPackageJson(jsonIsh, options = {}) {
         ]
       }
 
-      return overFields(sortObjectKeys(json, sortOrder))
+      if (options.fields) {
+        for (const field of options.fields) {
+          const idx = fields.findIndex((f) => f.key === field.key)
+
+          if (idx > -1) fields[idx] = field
+          if (idx === -1) fields.push(field)
+        }
+      }
+
+      return overFields(fields)(sortObjectKeys(json, sortOrder))
     }),
   )
 }
@@ -340,4 +350,5 @@ function sortPackageJson(jsonIsh, options = {}) {
 module.exports = sortPackageJson
 module.exports.sortPackageJson = sortPackageJson
 module.exports.sortOrder = defaultSortOrder
+module.exports.sortObjectBy = sortObjectBy
 module.exports.default = sortPackageJson
diff --git a/tests/options.js b/tests/options.js
index a55c3c04..e2aeda3d 100644
--- a/tests/options.js
+++ b/tests/options.js
@@ -1,5 +1,6 @@
 const test = require('ava')
 const { keysToObject, macro } = require('./_helpers')
+const sortPackageJson = require('..')
 
 test('options.sortOrder', macro.sortObject, {
   options: {
@@ -48,3 +49,23 @@ test('options.sortOrder with private key', macro.sortObject, {
   expect: keysToObject(['_z', 'name', 'a', 'z', '_a']),
   message: 'options.sortOrder should work with private keys`',
 })
+
+test('options.fields with existing key', macro.sortObject, {
+  options: {
+    fields: [{ key: 'scripts' }],
+  },
+  value: `{"scripts":{"z":"","a":""}}`,
+  expect: `{"scripts":{"z":"","a":""}}`,
+  message:
+    'options.fields should work with keys that are already present in the fields list`',
+})
+
+test('options.fields with new key', macro.sortObject, {
+  options: {
+    fields: [{ key: 'new-key', over: sortPackageJson.sortObjectBy() }],
+  },
+  value: `{"new-key":{"z":"","a":""}}`,
+  expect: `{"new-key":{"a":"","z":""}}`,
+  message:
+    'options.fields should work with keys that are not already present in the fields list`',
+})