diff --git a/.idea/codeStyles/Project.xml b/.idea/codeStyles/Project.xml
index bbd2082a9..ced0de8ab 100644
--- a/.idea/codeStyles/Project.xml
+++ b/.idea/codeStyles/Project.xml
@@ -33,6 +33,7 @@
       </option>
       <option name="NAME_COUNT_TO_USE_STAR_IMPORT" value="2147483647" />
       <option name="NAME_COUNT_TO_USE_STAR_IMPORT_FOR_MEMBERS" value="2147483647" />
+      <option name="CODE_STYLE_DEFAULTS" value="KOTLIN_OFFICIAL" />
     </JetCodeStyleSettings>
     <XML>
       <option name="XML_LEGACY_SETTINGS_IMPORTED" value="true" />
@@ -185,5 +186,11 @@
         </rules>
       </arrangement>
     </codeStyleSettings>
+    <codeStyleSettings language="kotlin">
+      <option name="CODE_STYLE_DEFAULTS" value="KOTLIN_OFFICIAL" />
+      <indentOptions>
+        <option name="CONTINUATION_INDENT_SIZE" value="4" />
+      </indentOptions>
+    </codeStyleSettings>
   </code_scheme>
 </component>
\ No newline at end of file
diff --git a/briar-headless/src/main/java/org/briarproject/briar/headless/BriarService.kt b/briar-headless/src/main/java/org/briarproject/briar/headless/BriarService.kt
index c5b2e05ee..18d7c8082 100644
--- a/briar-headless/src/main/java/org/briarproject/briar/headless/BriarService.kt
+++ b/briar-headless/src/main/java/org/briarproject/briar/headless/BriarService.kt
@@ -37,7 +37,7 @@ constructor(
                 ?: throw UsageError("Could not get password. Is STDIN connected?")
             try {
                 accountManager.signIn(password)
-            } catch (e : DecryptionException) {
+            } catch (e: DecryptionException) {
                 echo("Error: Password invalid")
                 exitProcess(1)
             }
diff --git a/briar-headless/src/main/java/org/briarproject/briar/headless/Router.kt b/briar-headless/src/main/java/org/briarproject/briar/headless/Router.kt
index 598c2a815..579552d43 100644
--- a/briar-headless/src/main/java/org/briarproject/briar/headless/Router.kt
+++ b/briar-headless/src/main/java/org/briarproject/briar/headless/Router.kt
@@ -3,7 +3,11 @@ package org.briarproject.briar.headless
 import com.fasterxml.jackson.core.JsonParseException
 import com.fasterxml.jackson.databind.ObjectMapper
 import io.javalin.Javalin
-import io.javalin.apibuilder.ApiBuilder.*
+import io.javalin.apibuilder.ApiBuilder.delete
+import io.javalin.apibuilder.ApiBuilder.get
+import io.javalin.apibuilder.ApiBuilder.path
+import io.javalin.apibuilder.ApiBuilder.post
+import io.javalin.apibuilder.ApiBuilder.put
 import io.javalin.core.security.AccessManager
 import io.javalin.core.util.Header.AUTHORIZATION
 import io.javalin.http.BadRequestResponse
diff --git a/briar-headless/src/main/java/org/briarproject/briar/headless/blogs/OutputBlogPost.kt b/briar-headless/src/main/java/org/briarproject/briar/headless/blogs/OutputBlogPost.kt
index af9ea2ab4..9f6e22b0c 100644
--- a/briar-headless/src/main/java/org/briarproject/briar/headless/blogs/OutputBlogPost.kt
+++ b/briar-headless/src/main/java/org/briarproject/briar/headless/blogs/OutputBlogPost.kt
@@ -6,16 +6,16 @@ import org.briarproject.briar.api.blog.MessageType
 import org.briarproject.briar.headless.json.JsonDict
 
 internal fun BlogPostHeader.output(text: String) = JsonDict(
-        "text" to text,
-        "author" to author.output(),
-        "authorStatus" to authorInfo.status.output(),
-        "type" to type.output(),
-        "id" to id.bytes,
-        "parentId" to parentId?.bytes,
-        "read" to isRead,
-        "rssFeed" to isRssFeed,
-        "timestamp" to timestamp,
-        "timestampReceived" to timeReceived
-    )
+    "text" to text,
+    "author" to author.output(),
+    "authorStatus" to authorInfo.status.output(),
+    "type" to type.output(),
+    "id" to id.bytes,
+    "parentId" to parentId?.bytes,
+    "read" to isRead,
+    "rssFeed" to isRssFeed,
+    "timestamp" to timestamp,
+    "timestampReceived" to timeReceived
+)
 
 internal fun MessageType.output() = name.toLowerCase()
diff --git a/briar-headless/src/main/java/org/briarproject/briar/headless/contact/OutputPendingContact.kt b/briar-headless/src/main/java/org/briarproject/briar/headless/contact/OutputPendingContact.kt
index 429edb44f..eecfba929 100644
--- a/briar-headless/src/main/java/org/briarproject/briar/headless/contact/OutputPendingContact.kt
+++ b/briar-headless/src/main/java/org/briarproject/briar/headless/contact/OutputPendingContact.kt
@@ -2,7 +2,11 @@ package org.briarproject.briar.headless.contact
 
 import org.briarproject.bramble.api.contact.PendingContact
 import org.briarproject.bramble.api.contact.PendingContactState
-import org.briarproject.bramble.api.contact.PendingContactState.*
+import org.briarproject.bramble.api.contact.PendingContactState.ADDING_CONTACT
+import org.briarproject.bramble.api.contact.PendingContactState.CONNECTING
+import org.briarproject.bramble.api.contact.PendingContactState.FAILED
+import org.briarproject.bramble.api.contact.PendingContactState.OFFLINE
+import org.briarproject.bramble.api.contact.PendingContactState.WAITING_FOR_CONNECTION
 import org.briarproject.bramble.api.contact.event.PendingContactAddedEvent
 import org.briarproject.bramble.api.contact.event.PendingContactRemovedEvent
 import org.briarproject.bramble.api.contact.event.PendingContactStateChangedEvent
@@ -14,7 +18,7 @@ internal fun PendingContact.output() = JsonDict(
     "timestamp" to timestamp
 )
 
-internal fun PendingContactState.output() = when(this) {
+internal fun PendingContactState.output() = when (this) {
     WAITING_FOR_CONNECTION -> "waiting_for_connection"
     OFFLINE -> "offline"
     CONNECTING -> "connecting"
diff --git a/briar-headless/src/test/java/org/briarproject/briar/headless/ControllerTest.kt b/briar-headless/src/test/java/org/briarproject/briar/headless/ControllerTest.kt
index c7d2a6aaf..a143f1ca5 100644
--- a/briar-headless/src/test/java/org/briarproject/briar/headless/ControllerTest.kt
+++ b/briar-headless/src/test/java/org/briarproject/briar/headless/ControllerTest.kt
@@ -14,7 +14,12 @@ import org.briarproject.bramble.api.identity.LocalAuthor
 import org.briarproject.bramble.api.sync.Group
 import org.briarproject.bramble.api.sync.Message
 import org.briarproject.bramble.api.system.Clock
-import org.briarproject.bramble.test.TestUtils.*
+import org.briarproject.bramble.test.TestUtils.getAuthor
+import org.briarproject.bramble.test.TestUtils.getClientId
+import org.briarproject.bramble.test.TestUtils.getContact
+import org.briarproject.bramble.test.TestUtils.getGroup
+import org.briarproject.bramble.test.TestUtils.getLocalAuthor
+import org.briarproject.bramble.test.TestUtils.getMessage
 import org.briarproject.bramble.util.StringUtils.getRandomString
 import org.briarproject.briar.api.conversation.ConversationManager
 import org.briarproject.briar.headless.event.WebSocketController
diff --git a/briar-headless/src/test/java/org/briarproject/briar/headless/IntegrationTest.kt b/briar-headless/src/test/java/org/briarproject/briar/headless/IntegrationTest.kt
index 6963fe91e..ac26ea72d 100644
--- a/briar-headless/src/test/java/org/briarproject/briar/headless/IntegrationTest.kt
+++ b/briar-headless/src/test/java/org/briarproject/briar/headless/IntegrationTest.kt
@@ -48,31 +48,31 @@ abstract class IntegrationTest {
         dataDir.deleteRecursively()
     }
 
-    protected fun get(url: String) : Response {
+    protected fun get(url: String): Response {
         return khttp.get(url, getAuthTokenHeader(token))
     }
 
-    protected fun getWithWrongToken(url: String) : Response {
+    protected fun getWithWrongToken(url: String): Response {
         return khttp.get(url, getAuthTokenHeader("wrongToken"))
     }
 
-    protected fun post(url: String, data: String) : Response {
+    protected fun post(url: String, data: String): Response {
         return khttp.post(url, getAuthTokenHeader(token), data = data)
     }
 
-    protected fun postWithWrongToken(url: String) : Response {
+    protected fun postWithWrongToken(url: String): Response {
         return khttp.post(url, getAuthTokenHeader("wrongToken"), data = "")
     }
 
-    protected fun delete(url: String) : Response {
+    protected fun delete(url: String): Response {
         return khttp.delete(url, getAuthTokenHeader(token))
     }
 
-    protected fun delete(url: String, data: String) : Response {
+    protected fun delete(url: String, data: String): Response {
         return khttp.delete(url, getAuthTokenHeader(token), data = data)
     }
 
-    protected fun deleteWithWrongToken(url: String) : Response {
+    protected fun deleteWithWrongToken(url: String): Response {
         return khttp.delete(url, getAuthTokenHeader("wrongToken"))
     }
 
diff --git a/briar-headless/src/test/java/org/briarproject/briar/headless/contact/ContactControllerIntegrationTest.kt b/briar-headless/src/test/java/org/briarproject/briar/headless/contact/ContactControllerIntegrationTest.kt
index dca4e336d..9c4cfcc2a 100644
--- a/briar-headless/src/test/java/org/briarproject/briar/headless/contact/ContactControllerIntegrationTest.kt
+++ b/briar-headless/src/test/java/org/briarproject/briar/headless/contact/ContactControllerIntegrationTest.kt
@@ -8,7 +8,7 @@ import org.junit.jupiter.api.Assertions.assertEquals
 import org.junit.jupiter.api.Assertions.assertTrue
 import org.junit.jupiter.api.Test
 
-class ContactControllerIntegrationTest: IntegrationTest() {
+class ContactControllerIntegrationTest : IntegrationTest() {
 
     @Test
     fun `returning list of contacts needs authentication token`() {
@@ -24,7 +24,7 @@ class ContactControllerIntegrationTest: IntegrationTest() {
         assertEquals(0, response.jsonArray.length())
 
         // add one test contact
-        val testContactName= "testContactName"
+        val testContactName = "testContactName"
         testDataCreator.addContact(testContactName, true, false)
 
         // retrieve list with one test contact
diff --git a/briar-headless/src/test/java/org/briarproject/briar/headless/contact/ContactControllerTest.kt b/briar-headless/src/test/java/org/briarproject/briar/headless/contact/ContactControllerTest.kt
index 1f4c75cca..1da24ee6f 100644
--- a/briar-headless/src/test/java/org/briarproject/briar/headless/contact/ContactControllerTest.kt
+++ b/briar-headless/src/test/java/org/briarproject/briar/headless/contact/ContactControllerTest.kt
@@ -1,8 +1,6 @@
 package org.briarproject.briar.headless.contact
 
 import io.javalin.http.BadRequestResponse
-import io.javalin.http.ForbiddenResponse
-import io.javalin.http.HttpResponseException
 import io.javalin.http.NotFoundResponse
 import io.javalin.plugin.json.JavalinJson.toJson
 import io.mockk.Runs
@@ -35,7 +33,6 @@ import org.briarproject.bramble.util.StringUtils.getRandomString
 import org.briarproject.briar.headless.ControllerTest
 import org.briarproject.briar.headless.getFromJson
 import org.briarproject.briar.headless.json.JsonDict
-import org.junit.jupiter.api.Assertions.assertEquals
 import org.junit.jupiter.api.Assertions.assertNotNull
 import org.junit.jupiter.api.Assertions.assertThrows
 import org.junit.jupiter.api.Test
@@ -316,7 +313,9 @@ internal class ContactControllerTest : ControllerTest() {
     fun testSetContactAliasInvalid() {
         mockkStatic("org.briarproject.briar.headless.RouterKt")
         every { ctx.pathParam("contactId") } returns "1"
-        every { ctx.getFromJson(objectMapper, "alias") } returns getRandomString(MAX_AUTHOR_NAME_LENGTH + 1)
+        every {
+            ctx.getFromJson(objectMapper, "alias")
+        } returns getRandomString(MAX_AUTHOR_NAME_LENGTH + 1)
         assertThrows(BadRequestResponse::class.java) {
             controller.setContactAlias(ctx)
         }