diff --git a/.gitignore b/.gitignore
index f3cac7d..79dae07 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 node_modules/
+/src/fixtures/tmp
 
 # Editors
 .vscode/
diff --git a/package-lock.json b/package-lock.json
index 827005d..a8974f8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,6 +13,7 @@
         "axios": "^0.27.2",
         "axios-retry": "^3.2.5",
         "espree": "^9.3.2",
+        "prettier": "^2.7.1",
         "string-format": "^1.0.0"
       },
       "devDependencies": {
@@ -3041,6 +3042,20 @@
         "node": ">=8"
       }
     },
+    "node_modules/prettier": {
+      "version": "2.7.1",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-2.7.1.tgz",
+      "integrity": "sha512-ujppO+MkdPqoVINuDFDRLClm7D78qbDt0/NR+wp5FqEZOoTNAjPHWj17QRhu7geIHJfcNhRk1XVQmF8Bp3ye+g==",
+      "bin": {
+        "prettier": "bin-prettier.js"
+      },
+      "engines": {
+        "node": ">=10.13.0"
+      },
+      "funding": {
+        "url": "https://github.com/prettier/prettier?sponsor=1"
+      }
+    },
     "node_modules/pretty-format": {
       "version": "28.1.1",
       "resolved": "https://registry.npmjs.org/pretty-format/-/pretty-format-28.1.1.tgz",
@@ -5878,6 +5893,11 @@
         "find-up": "^4.0.0"
       }
     },
+    "prettier": {
+      "version": "2.7.1",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-2.7.1.tgz",
+      "integrity": "sha512-ujppO+MkdPqoVINuDFDRLClm7D78qbDt0/NR+wp5FqEZOoTNAjPHWj17QRhu7geIHJfcNhRk1XVQmF8Bp3ye+g=="
+    },
     "pretty-format": {
       "version": "28.1.1",
       "resolved": "https://registry.npmjs.org/pretty-format/-/pretty-format-28.1.1.tgz",
diff --git a/package.json b/package.json
index 52ddded..91824aa 100644
--- a/package.json
+++ b/package.json
@@ -22,6 +22,7 @@
     "axios": "^0.27.2",
     "axios-retry": "^3.2.5",
     "espree": "^9.3.2",
+    "prettier": "^2.7.1",
     "string-format": "^1.0.0"
   },
   "devDependencies": {
diff --git a/src/config-parser.js b/src/config-parser.js
index 5ae53d8..58f89e5 100644
--- a/src/config-parser.js
+++ b/src/config-parser.js
@@ -1,6 +1,7 @@
 const fs = require('fs')
 const espree = require('espree')
 const format = require('string-format')
+const prettier = require('prettier')
 const core = require('@actions/core')
 
 // Parse the AST
@@ -12,10 +13,10 @@ const espreeOptions = {
 
 class ConfigParser {
   constructor(staticSiteConfig) {
-    this.pathPropertyNuxt = `router: {\n        base: '{0}'\n    }`
+    this.pathPropertyNuxt = `router: { base: '{0}' }`
     this.pathPropertyNext = `basePath: '{0}'`
     this.pathPropertyGatsby = `pathPrefix: '{0}'`
-    this.configskeleton = `export default {\n    {0}\n}`
+    this.configskeleton = `export default { {0} }`
     this.staticSiteConfig = staticSiteConfig
     this.config = fs.existsSync(this.staticSiteConfig.filePath)
       ? fs.readFileSync(this.staticSiteConfig.filePath, 'utf8')
@@ -40,19 +41,16 @@ class ConfigParser {
           this.configskeleton,
           format(this.pathPropertyNuxt, this.staticSiteConfig.newPath)
         )
-        break
       case 'next':
         return format(
           this.configskeleton,
           format(this.pathPropertyNext, this.staticSiteConfig.newPath)
         )
-        break
       case 'gatsby':
         return format(
           this.configskeleton,
           format(this.pathPropertyGatsby, this.staticSiteConfig.newPath)
         )
-        break
       default:
         throw 'Unknown config type'
     }
@@ -62,20 +60,20 @@ class ConfigParser {
     switch (this.staticSiteConfig.type) {
       case 'nuxt':
         return format(this.pathPropertyNuxt, this.staticSiteConfig.newPath)
-        break
       case 'next':
         return format(this.pathPropertyNext, this.staticSiteConfig.newPath)
-        break
       case 'gatsby':
         return format(this.pathPropertyGatsby, this.staticSiteConfig.newPath)
-        break
       default:
         throw 'Unknown config type'
     }
   }
 
   parse() {
+    // Print current configuration
     core.info(`original configuration:\n${this.config}`)
+
+    // Parse the AST
     const ast = espree.parse(this.config, espreeOptions)
 
     // Find the default export declaration node
@@ -103,8 +101,18 @@ class ConfigParser {
           throw 'Unknown config type'
       }
     }
+
+    // Write down the updated configuration
     core.info(`parsed configuration:\n${this.config}`)
     fs.writeFileSync(this.staticSiteConfig.filePath, this.config)
+
+    // Format the updated configuration with prettier's default settings
+    this.config = prettier.format(this.config, {
+      filePath: this.staticSiteConfig.filePath,
+      parser: 'babel' /* default ot javascript for when filePath is nil */
+    })
+
+    // Return the new configuration
     return this.config
   }
 
@@ -127,15 +135,13 @@ class ConfigParser {
             exportNode.expression.right.properties[0].range[0]
           ) +
           this.generateConfigProperty() +
-          ',\n' +
+          ',' +
           this.config.slice(exportNode.expression.right.properties[0].range[0])
         core.info('new config = \n' + this.config)
       } else {
         this.config =
           this.config.slice(0, exportNode.expression.right.range[0] + 1) +
-          '\n    ' +
           this.generateConfigProperty() +
-          '\n' +
           this.config.slice(exportNode.expression.right.range[1] - 1)
         core.info('new config = \n' + this.config)
       }
@@ -158,15 +164,13 @@ class ConfigParser {
         this.config =
           this.config.slice(0, exportNode.declaration.properties[0].range[0]) +
           this.generateConfigProperty() +
-          ',\n' +
+          ',' +
           this.config.slice(exportNode.declaration.properties[0].range[0])
         core.info('new config = \n' + this.config)
       } else {
         this.config =
           this.config.slice(0, exportNode.declaration.range[0] + 1) +
-          '\n    ' +
           this.generateConfigProperty() +
-          '\n' +
           this.config.slice(exportNode.declaration.range[1] - 1)
         core.info('new config = \n' + this.config)
       }
diff --git a/src/fixtures/expected/gatsby-config.js b/src/fixtures/expected/gatsby-config.js
index f00007b..dc69c4c 100644
--- a/src/fixtures/expected/gatsby-config.js
+++ b/src/fixtures/expected/gatsby-config.js
@@ -1,8 +1,8 @@
-import { resolve } from 'path'
+import {resolve} from 'path'
 
 export default {
   alias: {
-    'style': resolve(__dirname, './assets/style')
+    style: resolve(__dirname, './assets/style')
   },
-  pathPrefix: '/amazing-new-repo/',/* test */
-}
\ No newline at end of file
+  pathPrefix: '/amazing-new-repo/' /* test */
+}
diff --git a/src/fixtures/expected/gatsby-config.old.js b/src/fixtures/expected/gatsby-config.old.js
index 00b28db..931c175 100644
--- a/src/fixtures/expected/gatsby-config.old.js
+++ b/src/fixtures/expected/gatsby-config.old.js
@@ -1,3 +1,3 @@
 module.exports = {
   pathPrefix: '/amazing-new-repo/'
-}
\ No newline at end of file
+}
diff --git a/src/fixtures/expected/next.config.old.missing.js b/src/fixtures/expected/next.config.old.missing.js
index 139c3ef..793b836 100644
--- a/src/fixtures/expected/next.config.old.missing.js
+++ b/src/fixtures/expected/next.config.old.missing.js
@@ -1,3 +1 @@
-module.exports = {
-  basePath: '/amazing-new-repo/'
-}
+module.exports = {basePath: '/amazing-new-repo/'}
diff --git a/src/fixtures/expected/nuxt.config.js b/src/fixtures/expected/nuxt.config.js
index 53c5851..6148319 100644
--- a/src/fixtures/expected/nuxt.config.js
+++ b/src/fixtures/expected/nuxt.config.js
@@ -1,11 +1,11 @@
-import { resolve } from 'path'
+import {resolve} from 'path'
 
 export default {
   alias: {
-    'style': resolve(__dirname, './assets/style')
+    style: resolve(__dirname, './assets/style')
   },
   target: 'static',
   router: {
     base: '/amazing-new-repo/'
   }
-}
\ No newline at end of file
+}
diff --git a/src/fixtures/expected/nuxt.config.missing.js b/src/fixtures/expected/nuxt.config.missing.js
index 88b33da..4658555 100644
--- a/src/fixtures/expected/nuxt.config.missing.js
+++ b/src/fixtures/expected/nuxt.config.missing.js
@@ -1,11 +1,11 @@
-import { resolve } from 'path'
+import {resolve} from 'path'
 
 export default {
   router: {
-        base: '/amazing-new-repo/'
-    },
-alias: {
-    'style': resolve(__dirname, './assets/style')
+    base: '/amazing-new-repo/'
+  },
+  alias: {
+    style: resolve(__dirname, './assets/style')
   },
   target: 'static'
-}
\ No newline at end of file
+}
diff --git a/src/fixtures/expected/nuxt.config.old.js b/src/fixtures/expected/nuxt.config.old.js
index 67e0dcb..3033c56 100644
--- a/src/fixtures/expected/nuxt.config.old.js
+++ b/src/fixtures/expected/nuxt.config.old.js
@@ -1,7 +1,6 @@
-
-module.exports={
+module.exports = {
   alias: {
-    'style': resolve(__dirname, './assets/style')
+    style: resolve(__dirname, './assets/style')
   },
   target: 'static',
   router: {
diff --git a/src/fixtures/gatsby-config.js b/src/fixtures/gatsby-config.js
index 18a4e4b..59728fc 100644
--- a/src/fixtures/gatsby-config.js
+++ b/src/fixtures/gatsby-config.js
@@ -1,8 +1,8 @@
-import { resolve } from 'path'
+import {resolve} from 'path'
 
 export default {
   alias: {
-    'style': resolve(__dirname, './assets/style')
+    style: resolve(__dirname, './assets/style')
   },
-  pathPrefix: '/prefix',/* test */
-}
\ No newline at end of file
+  pathPrefix: '/prefix' /* test */
+}
diff --git a/src/fixtures/gatsby-config.old.js b/src/fixtures/gatsby-config.old.js
index 6634ad6..f9cbe16 100644
--- a/src/fixtures/gatsby-config.old.js
+++ b/src/fixtures/gatsby-config.old.js
@@ -1,3 +1,3 @@
 module.exports = {
   pathPrefix: '/prefix'
-}
\ No newline at end of file
+}
diff --git a/src/fixtures/nuxt.config.js b/src/fixtures/nuxt.config.js
index 6985d46..b0856ff 100644
--- a/src/fixtures/nuxt.config.js
+++ b/src/fixtures/nuxt.config.js
@@ -1,11 +1,11 @@
-import { resolve } from 'path'
+import {resolve} from 'path'
 
 export default {
   alias: {
-    'style': resolve(__dirname, './assets/style')
+    style: resolve(__dirname, './assets/style')
   },
   target: 'static',
   router: {
     base: 'some/path'
   }
-}
\ No newline at end of file
+}
diff --git a/src/fixtures/nuxt.config.missing.js b/src/fixtures/nuxt.config.missing.js
index b2f9501..7529ebd 100644
--- a/src/fixtures/nuxt.config.missing.js
+++ b/src/fixtures/nuxt.config.missing.js
@@ -1,8 +1,8 @@
-import { resolve } from 'path'
+import {resolve} from 'path'
 
 export default {
   alias: {
-    'style': resolve(__dirname, './assets/style')
+    style: resolve(__dirname, './assets/style')
   },
   target: 'static'
-}
\ No newline at end of file
+}
diff --git a/src/fixtures/nuxt.config.old.js b/src/fixtures/nuxt.config.old.js
index 347fa92..b61f4fa 100644
--- a/src/fixtures/nuxt.config.old.js
+++ b/src/fixtures/nuxt.config.old.js
@@ -1,7 +1,6 @@
-
-module.exports={
+module.exports = {
   alias: {
-    'style': resolve(__dirname, './assets/style')
+    style: resolve(__dirname, './assets/style')
   },
   target: 'static',
   router: {