diff --git a/.gitignore b/.gitignore
index 34977ee..811a238 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 node_modules
-.idea
\ No newline at end of file
+.idea
+*.iml
diff --git a/README.md b/README.md
index a036a9f..7b857a6 100644
--- a/README.md
+++ b/README.md
@@ -161,7 +161,7 @@ flatten({
 
 ### transformKey
 
-Transform each part of a flat key before and after flattening.
+Transform each part of a flat key before and after flattening. 
 
 ```javascript
 var flatten = require('flat')
@@ -208,6 +208,59 @@ unflatten({
 // }
 ```
 
+### transformFirst
+
+Transforms the top-level key before and after flattening. It has two arguments:
+                                                          
+1. The key to transform
+1. An optional delimiter. This is not required, but allows the transformation to
+add a new key to the transformation.
+
+```javascript
+var flatten = require('flat')
+var unflatten = require('flat').unflatten
+
+flatten({
+    key1: {
+        keyA: 'valueI'
+    },
+    key2: {
+        keyB: 'valueII'
+    },
+    key3: { a: { b: { c: 2 } } }
+}, {
+    transformFirst: function(key, delim){
+      return 'foo' + delim + key;
+    }
+})
+
+// {
+//   'foo.key1.keyA': 'valueI',
+//   'foo.key2.keyB': 'valueII',
+//   'foo.key3.a.b.c': 2
+// }
+
+unflatten({
+      'foo.key1.keyA': 'valueI',
+      'foo.key2.keyB': 'valueII',
+      'foo.key3.a.b.c': 2
+}, {
+    transformFirst: function(key, delim){
+      return key.substring((key+delim).length)
+    }
+})
+
+// {
+//     key1: {
+//         keyA: 'valueI'
+//     },
+//     key2: {
+//         keyB: 'valueII'
+//     },
+//     key3: { a: { b: { c: 2 } } }
+// }
+```
+
 ## Command Line Usage
 
 `flat` is also available as a command line tool. You can run it with 
diff --git a/index.js b/index.js
index c8032e9..b094a74 100644
--- a/index.js
+++ b/index.js
@@ -14,6 +14,7 @@ function flatten (target, opts) {
   const delimiter = opts.delimiter || '.'
   const maxDepth = opts.maxDepth
   const transformKey = opts.transformKey || keyIdentity
+  const transformFirst = opts.transformFirst || keyIdentity
   const output = {}
 
   function step (object, prev, currentDepth) {
@@ -30,18 +31,18 @@ function flatten (target, opts) {
 
       const newKey = prev
         ? prev + delimiter + transformKey(key)
-        : transformKey(key)
+        : transformFirst(transformKey(key), delimiter)
 
       if (!isarray && !isbuffer && isobject && Object.keys(value).length &&
         (!opts.maxDepth || currentDepth < maxDepth)) {
-        return step(value, newKey, currentDepth + 1)
+        return step(value, newKey, currentDepth + 1, false)
       }
 
       output[newKey] = value
     })
   }
 
-  step(target)
+  step(target, false, 1)
 
   return output
 }
@@ -52,6 +53,7 @@ function unflatten (target, opts) {
   const delimiter = opts.delimiter || '.'
   const overwrite = opts.overwrite || false
   const transformKey = opts.transformKey || keyIdentity
+  const transformFirst = opts.transformFirst || keyIdentity
   const result = {}
 
   const isbuffer = isBuffer(target)
@@ -110,7 +112,7 @@ function unflatten (target, opts) {
   }, {})
 
   Object.keys(target).forEach(function (key) {
-    const split = key.split(delimiter).map(transformKey)
+    const split = transformFirst(key, delimiter).split(delimiter).map(transformKey)
     let key1 = getkey(split.shift())
     let key2 = getkey(split[0])
     let recipient = result
diff --git a/package-lock.json b/package-lock.json
index b0dacab..64093d6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,44 +5,56 @@
   "requires": true,
   "dependencies": {
     "@babel/code-frame": {
-      "version": "7.5.5",
-      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.5.5.tgz",
-      "integrity": "sha512-27d4lZoomVyo51VegxI20xZPuSHusqbQag/ztrBC7wegWoQ1nLREPVSKSW8byhTlzTKyNE4ifaTA6lCp7JjpFw==",
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.10.4.tgz",
+      "integrity": "sha512-vG6SvB6oYEhvgisZNFRmRCUkLz11c7rp+tbNTynGqc6mS1d5ATd/sGyV6W0KZZnXRKMTzZDRgQT3Ou9jhpAfUg==",
       "dev": true,
       "requires": {
-        "@babel/highlight": "^7.0.0"
+        "@babel/highlight": "^7.10.4"
       }
     },
+    "@babel/helper-validator-identifier": {
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.10.4.tgz",
+      "integrity": "sha512-3U9y+43hz7ZM+rzG24Qe2mufW5KhvFg/NhnNph+i9mgCtdTCtMJuI1TMkrIUiK7Ix4PYlRF9I5dhqaLYA/ADXw==",
+      "dev": true
+    },
     "@babel/highlight": {
-      "version": "7.5.0",
-      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.5.0.tgz",
-      "integrity": "sha512-7dV4eu9gBxoM0dAnj/BCFDW9LFU0zvTrkq0ugM7pnHEgguOEeOz1so2ZghEdzviYzQEED0r4EAgpsBChKy1TRQ==",
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.10.4.tgz",
+      "integrity": "sha512-i6rgnR/YgPEQzZZnbTHHuZdlE8qyoBNalD6F+q4vAFlcMEcqmkoG+mPqJYJCo63qPf74+Y1UZsl3l6f7/RIkmA==",
       "dev": true,
       "requires": {
+        "@babel/helper-validator-identifier": "^7.10.4",
         "chalk": "^2.0.0",
-        "esutils": "^2.0.2",
         "js-tokens": "^4.0.0"
       }
     },
+    "@types/color-name": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/@types/color-name/-/color-name-1.1.1.tgz",
+      "integrity": "sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ==",
+      "dev": true
+    },
     "acorn": {
-      "version": "7.1.0",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.1.0.tgz",
-      "integrity": "sha512-kL5CuoXA/dgxlBbVrflsflzQ3PAas7RYZB52NOm/6839iVYJgKMJ3cQJD+t2i5+qFa8h3MDpEOJiS64E8JLnSQ==",
+      "version": "7.3.1",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.3.1.tgz",
+      "integrity": "sha512-tLc0wSnatxAQHVHUapaHdz72pi9KUyHjq5KyHjGg9Y8Ifdc79pTh2XvI6I1/chZbnM7QtNKzh66ooDogPZSleA==",
       "dev": true
     },
     "acorn-jsx": {
-      "version": "5.1.0",
-      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.1.0.tgz",
-      "integrity": "sha512-tMUqwBWfLFbJbizRmEcWSLw6HnFzfdJs2sOJEOwwtVPMoH/0Ay+E703oZz78VSXZiiDcZrQ5XKjPIUQixhmgVw==",
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.2.0.tgz",
+      "integrity": "sha512-HiUX/+K2YpkpJ+SzBffkM/AQ2YE03S0U1kjTLVpoJdhZMOWy8qvXVN9JdLqv2QsaQ6MPYQIuNmwD8zOiYUofLQ==",
       "dev": true
     },
     "ajv": {
-      "version": "6.10.2",
-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.10.2.tgz",
-      "integrity": "sha512-TXtUUEYHuaTEbLZWIKUr5pmBuhDLy+8KYtPYdcV8qC+pOZL+NKqYwvWSRrVXHn+ZmRRAu8vJTAznH7Oag6RVRw==",
+      "version": "6.12.3",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.3.tgz",
+      "integrity": "sha512-4K0cK3L1hsqk9xIb2z9vs/XU+PGJZ9PNpJRDS9YLzmNdX6jmVPfamLvTJr0aDAusnHyCHO6MjzlkAsgtqp9teA==",
       "dev": true,
       "requires": {
-        "fast-deep-equal": "^2.0.1",
+        "fast-deep-equal": "^3.1.1",
         "fast-json-stable-stringify": "^2.0.0",
         "json-schema-traverse": "^0.4.1",
         "uri-js": "^4.2.2"
@@ -55,10 +67,21 @@
       "dev": true
     },
     "ansi-escapes": {
-      "version": "3.2.0",
-      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.2.0.tgz",
-      "integrity": "sha512-cBhpre4ma+U0T1oM5fXg7Dy1Jw7zzwv7lt/GoCpr+hDQJoYnKVPLL4dCvSEFMmQurOQvSrwT7SL/DAlhBI97RQ==",
-      "dev": true
+      "version": "4.3.1",
+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-4.3.1.tgz",
+      "integrity": "sha512-JWF7ocqNrp8u9oqpgV+wH5ftbt+cfvv+PTjOvKLT3AdYly/LmORARfEVT1iyjwN+4MqE5UmVKoAdIBqeoCHgLA==",
+      "dev": true,
+      "requires": {
+        "type-fest": "^0.11.0"
+      },
+      "dependencies": {
+        "type-fest": {
+          "version": "0.11.0",
+          "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.11.0.tgz",
+          "integrity": "sha512-OdjXJxnCN1AvyLSzeKIgXTXxV+99ZuXl3Hpo9XpJAv9MBcHrrJOQ5kV7ypXOuQie+AmWG25hLbiKdwYTifzcfQ==",
+          "dev": true
+        }
+      }
     },
     "ansi-regex": {
       "version": "3.0.0",
@@ -85,13 +108,14 @@
       }
     },
     "array-includes": {
-      "version": "3.0.3",
-      "resolved": "https://registry.npmjs.org/array-includes/-/array-includes-3.0.3.tgz",
-      "integrity": "sha1-GEtI9i2S10UrsxsyMWXH+L0CJm0=",
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/array-includes/-/array-includes-3.1.1.tgz",
+      "integrity": "sha512-c2VXaCHl7zPsvpkFsw4nxvFie4fh1ur9bpcgsVkIjqn0H/Xwdg+7fv3n2r/isyS8EBj5b06M9kHyZuIr4El6WQ==",
       "dev": true,
       "requires": {
-        "define-properties": "^1.1.2",
-        "es-abstract": "^1.7.0"
+        "define-properties": "^1.1.3",
+        "es-abstract": "^1.17.0",
+        "is-string": "^1.0.5"
       }
     },
     "astral-regex": {
@@ -163,18 +187,18 @@
       "dev": true
     },
     "cli-cursor": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-2.1.0.tgz",
-      "integrity": "sha1-s12sN2R5+sw+lHR9QdDQ9SOP/LU=",
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-3.1.0.tgz",
+      "integrity": "sha512-I/zHAwsKf9FqGoXM4WWRACob9+SNukZTd94DWF57E4toouRulbCxcUh6RKUEOQlYTHJnzkPMySvPNaaSLNfLZw==",
       "dev": true,
       "requires": {
-        "restore-cursor": "^2.0.0"
+        "restore-cursor": "^3.1.0"
       }
     },
     "cli-width": {
-      "version": "2.2.0",
-      "resolved": "https://registry.npmjs.org/cli-width/-/cli-width-2.2.0.tgz",
-      "integrity": "sha1-/xnt6Kml5XkyQUewwR8PvLq+1jk=",
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/cli-width/-/cli-width-3.0.0.tgz",
+      "integrity": "sha512-FxqpkPPwu1HjuN93Omfm4h8uIanXofW0RxVEW3k5RKx+mJJYSthzNhp32Kzxxy3YAEZ/Dc/EWN1vZRY0+kOhbw==",
       "dev": true
     },
     "cliui": {
@@ -254,6 +278,14 @@
         "semver": "^5.5.0",
         "shebang-command": "^1.2.0",
         "which": "^1.2.9"
+      },
+      "dependencies": {
+        "semver": {
+          "version": "5.7.1",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",
+          "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==",
+          "dev": true
+        }
       }
     },
     "debug": {
@@ -307,9 +339,9 @@
       },
       "dependencies": {
         "ignore": {
-          "version": "5.1.4",
-          "resolved": "https://registry.npmjs.org/ignore/-/ignore-5.1.4.tgz",
-          "integrity": "sha512-MzbUSahkTW1u7JpKKjY7LCARd1fU5W2rLdxlM4kdkayuCwZImjkpluF9CM1aLewYJguPDqewLam18Y6AU69A8A==",
+          "version": "5.1.8",
+          "resolved": "https://registry.npmjs.org/ignore/-/ignore-5.1.8.tgz",
+          "integrity": "sha512-BMpfD7PpiETpBl/A6S498BaIJ6Y/ABT93ETbby2fP00v4EbvPBXWEoaR1UBPKs3iR53pJY7EtZk5KACI57i1Uw==",
           "dev": true
         }
       }
@@ -345,27 +377,36 @@
       }
     },
     "es-abstract": {
-      "version": "1.16.0",
-      "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.16.0.tgz",
-      "integrity": "sha512-xdQnfykZ9JMEiasTAJZJdMWCQ1Vm00NBw79/AWi7ELfZuuPCSOMDZbT9mkOfSctVtfhb+sAAzrm+j//GjjLHLg==",
+      "version": "1.17.6",
+      "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.17.6.tgz",
+      "integrity": "sha512-Fr89bON3WFyUi5EvAeI48QTWX0AyekGgLA8H+c+7fbfCkJwRWRMLd8CQedNEyJuoYYhmtEqY92pgte1FAhBlhw==",
       "dev": true,
       "requires": {
-        "es-to-primitive": "^1.2.0",
+        "es-to-primitive": "^1.2.1",
         "function-bind": "^1.1.1",
         "has": "^1.0.3",
-        "has-symbols": "^1.0.0",
-        "is-callable": "^1.1.4",
-        "is-regex": "^1.0.4",
-        "object-inspect": "^1.6.0",
+        "has-symbols": "^1.0.1",
+        "is-callable": "^1.2.0",
+        "is-regex": "^1.1.0",
+        "object-inspect": "^1.7.0",
         "object-keys": "^1.1.1",
-        "string.prototype.trimleft": "^2.1.0",
-        "string.prototype.trimright": "^2.1.0"
+        "object.assign": "^4.1.0",
+        "string.prototype.trimend": "^1.0.1",
+        "string.prototype.trimstart": "^1.0.1"
+      },
+      "dependencies": {
+        "has-symbols": {
+          "version": "1.0.1",
+          "resolved": "https://registry.npmjs.org/has-symbols/-/has-symbols-1.0.1.tgz",
+          "integrity": "sha512-PLcsoqu++dmEIZB+6totNFKq/7Do+Z0u4oT0zKOJNl3lYK6vGwwu2hjHs+68OEZbTjiUE9bgOABXbP/GvrS0Kg==",
+          "dev": true
+        }
       }
     },
     "es-to-primitive": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/es-to-primitive/-/es-to-primitive-1.2.0.tgz",
-      "integrity": "sha512-qZryBOJjV//LaxLTV6UC//WewneB3LcXOL9NP++ozKVXsIIIpm/2c13UDiD9Jp2eThsecw9m3jPqDwTyobcdbg==",
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/es-to-primitive/-/es-to-primitive-1.2.1.tgz",
+      "integrity": "sha512-QCOllgZJtaUo9miYBcLChTUaHNjJF3PYs1VidD7AwiEj1kYxKeQTctLAezAOH5ZKRH0g2IgPn6KwB4IT8iRpvA==",
       "dev": true,
       "requires": {
         "is-callable": "^1.1.4",
@@ -380,9 +421,9 @@
       "dev": true
     },
     "eslint": {
-      "version": "6.4.0",
-      "resolved": "https://registry.npmjs.org/eslint/-/eslint-6.4.0.tgz",
-      "integrity": "sha512-WTVEzK3lSFoXUovDHEbkJqCVPEPwbhCq4trDktNI6ygs7aO41d4cDT0JFAT5MivzZeVLWlg7vHL+bgrQv/t3vA==",
+      "version": "6.8.0",
+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-6.8.0.tgz",
+      "integrity": "sha512-K+Iayyo2LtyYhDSYwz5D5QdWw0hCacNzyq1Y821Xna2xSJj7cijoLLYmLxTQgcgZ9mC61nryMy9S7GRbYpI5Ig==",
       "dev": true,
       "requires": {
         "@babel/code-frame": "^7.0.0",
@@ -392,19 +433,19 @@
         "debug": "^4.0.1",
         "doctrine": "^3.0.0",
         "eslint-scope": "^5.0.0",
-        "eslint-utils": "^1.4.2",
+        "eslint-utils": "^1.4.3",
         "eslint-visitor-keys": "^1.1.0",
-        "espree": "^6.1.1",
+        "espree": "^6.1.2",
         "esquery": "^1.0.1",
         "esutils": "^2.0.2",
         "file-entry-cache": "^5.0.1",
         "functional-red-black-tree": "^1.0.1",
         "glob-parent": "^5.0.0",
-        "globals": "^11.7.0",
+        "globals": "^12.1.0",
         "ignore": "^4.0.6",
         "import-fresh": "^3.0.0",
         "imurmurhash": "^0.1.4",
-        "inquirer": "^6.4.1",
+        "inquirer": "^7.0.0",
         "is-glob": "^4.0.0",
         "js-yaml": "^3.13.1",
         "json-stable-stringify-without-jsonify": "^1.0.1",
@@ -413,7 +454,7 @@
         "minimatch": "^3.0.4",
         "mkdirp": "^0.5.1",
         "natural-compare": "^1.4.0",
-        "optionator": "^0.8.2",
+        "optionator": "^0.8.3",
         "progress": "^2.0.0",
         "regexpp": "^2.0.1",
         "semver": "^6.1.2",
@@ -439,12 +480,6 @@
             "ms": "^2.1.1"
           }
         },
-        "semver": {
-          "version": "6.3.0",
-          "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
-          "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==",
-          "dev": true
-        },
         "strip-ansi": {
           "version": "5.2.0",
           "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
@@ -453,19 +488,13 @@
           "requires": {
             "ansi-regex": "^4.1.0"
           }
-        },
-        "strip-json-comments": {
-          "version": "3.0.1",
-          "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-3.0.1.tgz",
-          "integrity": "sha512-VTyMAUfdm047mwKl+u79WIdrZxtFtn+nBxHeb844XBQ9uMNTuTHdx2hc5RiAJYqwTj3wc/xe5HLSdJSkJ+WfZw==",
-          "dev": true
         }
       }
     },
     "eslint-config-standard": {
-      "version": "14.1.0",
-      "resolved": "https://registry.npmjs.org/eslint-config-standard/-/eslint-config-standard-14.1.0.tgz",
-      "integrity": "sha512-EF6XkrrGVbvv8hL/kYa/m6vnvmUT+K82pJJc4JJVMM6+Qgqh0pnwprSxdduDLB9p/7bIxD+YV5O0wfb8lmcPbA==",
+      "version": "14.1.1",
+      "resolved": "https://registry.npmjs.org/eslint-config-standard/-/eslint-config-standard-14.1.1.tgz",
+      "integrity": "sha512-Z9B+VR+JIXRxz21udPTL9HpFMyoMUEeX1G251EQ6e05WD9aPVtVBn09XUmZ259wCMlCDmYDSZG62Hhm+ZTJcUg==",
       "dev": true
     },
     "eslint-config-standard-jsx": {
@@ -475,13 +504,13 @@
       "dev": true
     },
     "eslint-import-resolver-node": {
-      "version": "0.3.2",
-      "resolved": "https://registry.npmjs.org/eslint-import-resolver-node/-/eslint-import-resolver-node-0.3.2.tgz",
-      "integrity": "sha512-sfmTqJfPSizWu4aymbPr4Iidp5yKm8yDkHp+Ir3YiTHiiDfxh69mOUsmiqW6RZ9zRXFaF64GtYmN7e+8GHBv6Q==",
+      "version": "0.3.4",
+      "resolved": "https://registry.npmjs.org/eslint-import-resolver-node/-/eslint-import-resolver-node-0.3.4.tgz",
+      "integrity": "sha512-ogtf+5AB/O+nM6DIeBUNr2fuT7ot9Qg/1harBfBtaP13ekEWFQEEMP94BCB7zaNW3gyY+8SHYF00rnqYwXKWOA==",
       "dev": true,
       "requires": {
         "debug": "^2.6.9",
-        "resolve": "^1.5.0"
+        "resolve": "^1.13.1"
       },
       "dependencies": {
         "debug": {
@@ -502,12 +531,12 @@
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       "dependencies": {
         "ansi-regex": {
@@ -2215,9 +2491,9 @@
       }
     },
     "yargs-parser": {
-      "version": "13.1.1",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.1.tgz",
-      "integrity": "sha512-oVAVsHz6uFrg3XQheFII8ESO2ssAf9luWuAd6Wexsu4F3OtIW0o8IribPXYrD4WC24LWtPrJlGy87y5udK+dxQ==",
+      "version": "13.1.2",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.2.tgz",
+      "integrity": "sha512-3lbsNRf/j+A4QuSZfDRA7HRSfWrzO0YjqTJd5kjAq37Zep1CEgaYmrH9Q3GwPiB9cHyd1Y1UwggGhJGoxipbzg==",
       "dev": true,
       "requires": {
         "camelcase": "^5.0.0",
diff --git a/package.json b/package.json
index d1b9f86..d7e947f 100644
--- a/package.json
+++ b/package.json
@@ -9,8 +9,8 @@
   "license": "BSD-3-Clause",
   "description": "Take a nested Javascript object and flatten it, or unflatten an object with delimited keys",
   "devDependencies": {
-    "mocha": "~6.2.2",
-    "standard": "^14.3.1"
+    "mocha": "^6.2.3",
+    "standard": "^14.3.4"
   },
   "directories": {
     "test": "test"
diff --git a/test/test.js b/test/test.js
index d86d396..fd571ec 100644
--- a/test/test.js
+++ b/test/test.js
@@ -195,6 +195,125 @@ suite('Flatten', function () {
     })
   })
 
+  test('Transformed First Key', function () {
+    assert.deepStrictEqual(flatten({
+      hello: {
+        world: {
+          again: 'good morning'
+        }
+      },
+      lorem: {
+        ipsum: {
+          dolor: 'good evening'
+        }
+      }
+    }, {
+      transformFirst: function (key) {
+        return '__' + key + '__'
+      }
+    }), {
+      '__hello__.world.again': 'good morning',
+      '__lorem__.ipsum.dolor': 'good evening'
+    })
+  })
+
+  test('Transformed First Key with Custom Delimiter', function () {
+    assert.deepStrictEqual(flatten({
+      hello: {
+        world: {
+          again: 'good morning'
+        }
+      },
+      lorem: {
+        ipsum: {
+          dolor: 'good evening'
+        }
+      }
+    }, {
+      transformFirst: function (key) {
+        return '__' + key + '__'
+      },
+      delimiter: ':'
+    }), {
+      '__hello__:world:again': 'good morning',
+      '__lorem__:ipsum:dolor': 'good evening'
+    })
+  })
+
+  test('Transformed First Key to Add Prefix with Default Delimiter', function () {
+    assert.deepStrictEqual(flatten({
+      hello: {
+        world: {
+          again: 'good morning'
+        }
+      },
+      lorem: {
+        ipsum: {
+          dolor: 'good evening'
+        }
+      }
+    }, {
+      transformFirst: function (key, delim) {
+        return 'foo' + delim + key
+      }
+    }), {
+      'foo.hello.world.again': 'good morning',
+      'foo.lorem.ipsum.dolor': 'good evening'
+    })
+  })
+
+
+  test('Transformed First Key to Add Prefix with Custom Delimiter', function () {
+    assert.deepStrictEqual(flatten({
+      hello: {
+        world: {
+          again: 'good morning'
+        }
+      },
+      lorem: {
+        ipsum: {
+          dolor: 'good evening'
+        }
+      }
+    }, {
+      transformFirst: function (key, delim) {
+        return 'foo' + delim + key
+      },
+      delimiter: ':'
+    }), {
+      'foo:hello:world:again': 'good morning',
+      'foo:lorem:ipsum:dolor': 'good evening'
+    })
+  })
+
+
+  test('Transformed Results and Keys', function () {
+    assert.deepStrictEqual(flatten({
+      hello: {
+        world: {
+          again: 'good morning'
+        }
+      },
+      lorem: {
+        ipsum: {
+          dolor: 'good evening'
+        }
+      }
+    }, {
+      transformKey: function (key) {
+        return '__' + key + '__'
+      },
+      transformFirst: function (key, delim) {
+        return 'translated' + delim + key
+      }
+    }), {
+      'translated.__hello__.__world__.__again__': 'good morning',
+      'translated.__lorem__.__ipsum__.__dolor__': 'good evening'
+    })
+  })
+
+
+
   test('Should keep number in the left when object', function () {
     assert.deepStrictEqual(flatten({
       hello: {
@@ -321,6 +440,56 @@ suite('Unflatten', function () {
     })
   })
 
+
+  test('Transformed First Key', function () {
+    assert.deepStrictEqual(unflatten({
+      'foo.hello.world.again': 'good morning',
+      'foo.lorem.ipsum.dolor': 'good evening'
+    }, {
+      transformFirst: function (key, delim) {
+        return key.substring(('foo'+delim).length)
+      }
+    }), {
+      hello: {
+        world: {
+          again: 'good morning'
+        }
+      },
+      lorem: {
+        ipsum: {
+          dolor: 'good evening'
+        }
+      }
+    })
+  })
+
+
+  test('Transformed First Key and Subsequent Keys', function () {
+    assert.deepStrictEqual(unflatten({
+      'foo.__hello__.__world__.__again__': 'good morning',
+      'foo.__lorem__.__ipsum__.__dolor__': 'good evening'
+    }, {
+      transformKey: function (key) {
+        return key.substring(2, key.length - 2)
+      },
+      transformFirst: function (key, delim) {
+        return key.substring(('foo'+delim).length)
+      }
+    }), {
+      hello: {
+        world: {
+          again: 'good morning'
+        }
+      },
+      lorem: {
+        ipsum: {
+          dolor: 'good evening'
+        }
+      }
+    })
+  })
+
+
   test('Messy', function () {
     assert.deepStrictEqual({
       hello: { world: 'again' },