diff --git a/.env.DEV b/.env.DEV
index 401cc7e..f0eb2cb 100644
--- a/.env.DEV
+++ b/.env.DEV
@@ -9,3 +9,4 @@ USE_CDN=
 API_KEY='example-application-id'
 API_SECRET='example-secret'
 COOKIE_SECRET='b8f6959746b617d9c9e90ce4a4b6e0'
+WCIF_DATA_FOLDER=wcif_data
diff --git a/.gitignore b/.gitignore
index 8f5c99a..250d4ab 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@ google-credentials.json
 .env.*
 !.env.DEV
 .wcif_cache
+wcif_data
 
 # Logs
 logs
diff --git a/README.md b/README.md
index c651743..42b397b 100644
--- a/README.md
+++ b/README.md
@@ -10,10 +10,10 @@ Node must be installed on your machine.
 
 ```
 $ npm install
-$ ENV=DEV npx nodemon .
+$ npm run dev-server
 ```
 
-`ENV=DEV` uses a dev WCA environment running on the same machine. If you would like to use the production WCA site, you need to:
+Running the development server will use uses a dev WCA environment running on the same machine. If you would like to use the production WCA site, you need to:
 
 1. Make an OAuth application [here](https://www.worldcubeassociation.org/oauth/applications). For "Scopes", use `public manage_competitions`; for "Callback Urls" use `http://localhost:3033/auth/oauth_response`.
 2. Make a copy of the `.env.DEV` file, such as `.env.PROD`. This file should not be committed; `.gitignore` should automatically ignore it.
diff --git a/functions/functions.js b/functions/functions.js
index 1b0d44d..27a5abd 100644
--- a/functions/functions.js
+++ b/functions/functions.js
@@ -17,5 +17,6 @@ module.exports = {
           require('./tuple').functions,
           require('./udf').functions,
           require('./util').functions,
+          require('./wcif').functions,
       )
 }
diff --git a/functions/wcif.js b/functions/wcif.js
new file mode 100644
index 0000000..7b957fc
--- /dev/null
+++ b/functions/wcif.js
@@ -0,0 +1,96 @@
+const fs = require('fs')
+const fse = require('fs-extra')
+
+const ClearWCIF = {
+  name: 'ClearWCIF',
+  docs: 'Remove all childActivities keeping only the main schedule, remove all assignments, cleanup roles, cleanup NatsHelper extension data.',
+  args: [
+    {
+      name: 'clearExternalExtensions',
+      type: 'Boolean',
+      docs: 'Also cleanup external tools extensions.',
+      defaultValue: false,
+    },
+  ],
+  outputType: 'Void',
+  usesContext: true,
+  mutations: ['schedule', 'persons'],
+  implementation: (ctx, clearExternalExtensions) => {
+    const cleanupExtensions = (object) => {
+      if (clearExternalExtensions) {
+        object.extensions = []
+      } else {
+        object.extensions = object.extensions.filter(({ id }) => !id.startsWith("org.cubingusa.natshelper"))
+      }
+    }
+    cleanupExtensions(competition)
+    ctx.competition.persons.forEach((person) => {
+      // Cleanup roles which are user-defined.
+      const immutableRoles = ['delegate', 'organizer', 'trainee-delegate']
+      person.roles = person.roles.filter((r) => immutableRoles.includes(r))
+      person.assignments = []
+      cleanupExtensions(person)
+    })
+    ctx.competition.schedule.venues.forEach((venue) => {
+      venue.rooms.forEach((room) => {
+        cleanupExtensions(room)
+        room.activities.forEach((activity) => {
+          cleanupExtensions(activity)
+          activity.childActivities = []
+        })
+      })
+    })
+  }
+}
+
+const ImportWCIF = {
+  name: 'ImportWCIF',
+  docs: 'Import the WCIF from a json file',
+  args: [
+    {
+      name: 'filename',
+      type: 'String',
+      docs: 'WCIF filename (relative to WCIF_DATA_FOLDER/competitionId)',
+    },
+  ],
+  outputType: 'String',
+  usesContext: true,
+  implementation: (ctx, filename) => {
+    var fullPath = `${process.env.WCIF_DATA_FOLDER || '.'}/${ctx.competition.id}/${filename}`
+    var wcif = JSON.parse(fs.readFileSync(fullPath))
+    if (wcif.id !== ctx.competition.id) {
+      throw new Error(`The WCIF is not for the correct competition (expected "${ctx.competition.id}", but got "${wcif.id})"`)
+    }
+    ctx.competition = wcif
+    return `Imported WCIF from '${fullPath}'.`
+  }
+}
+
+const ExportWCIF = {
+  name: 'ExportWCIF',
+  docs: 'Export the WCIF to a json file',
+  args: [
+    {
+      name: 'filename',
+      type: 'String',
+      docs: 'WCIF filename (emitted in WCIF_DATA_FOLDER/competitionId)',
+      defaultValue: 'wcif.json',
+    },
+  ],
+  outputType: 'String',
+  usesContext: true,
+  implementation: (ctx, filename) => {
+    var folder = `${process.env.WCIF_DATA_FOLDER || '.'}/${ctx.competition.id}`;
+    var fullPath = `${folder}/${filename}`
+    fse.ensureDirSync(folder)
+    fs.writeFileSync(
+      fullPath,
+      JSON.stringify(ctx.competition, null, 2)
+    )
+    return `WCIF saved to '${fullPath}'.`
+  }
+}
+
+module.exports = {
+  functions: [ClearWCIF, ExportWCIF, ImportWCIF],
+}
diff --git a/package.json b/package.json
index 466bc10..7476a54 100644
--- a/package.json
+++ b/package.json
@@ -18,6 +18,7 @@
   "version": "1.0.0",
   "main": "main.js",
   "scripts": {
+    "dev-server": "ENV=DEV npx nodemon -i wcif_data .",
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "repository": {
diff --git a/wcif_data/.keep b/wcif_data/.keep
new file mode 100644
index 0000000..e69de29