diff --git a/src/api/endpoints/aggregation/posts/like.js b/src/api/endpoints/aggregation/posts/like.ts
similarity index 88%
rename from src/api/endpoints/aggregation/posts/like.js
rename to src/api/endpoints/aggregation/posts/like.ts
index 02724aceb..38ed7e6e1 100644
--- a/src/api/endpoints/aggregation/posts/like.js
+++ b/src/api/endpoints/aggregation/posts/like.ts
@@ -3,7 +3,7 @@
 /**
  * Module dependencies
  */
-import * as mongo from 'mongodb';
+import it from '../../../it';
 import Post from '../../../models/post';
 import Like from '../../../models/like';
 
@@ -17,14 +17,12 @@ module.exports = (params) =>
 	new Promise(async (res, rej) =>
 {
 	// Get 'post_id' parameter
-	const postId = params.post_id;
-	if (postId === undefined || postId === null) {
-		return rej('post_id is required');
-	}
+	const [postId, postIdErr] = it(params.post_id).expect.id().required().qed();
+	if (postIdErr) return rej('invalid post_id param');
 
 	// Lookup post
 	const post = await Post.findOne({
-		_id: new mongo.ObjectID(postId)
+		_id: postId
 	});
 
 	if (post === null) {
diff --git a/src/api/endpoints/aggregation/posts/likes.js b/src/api/endpoints/aggregation/posts/likes.ts
similarity index 87%
rename from src/api/endpoints/aggregation/posts/likes.js
rename to src/api/endpoints/aggregation/posts/likes.ts
index 1049c7068..55fe077f6 100644
--- a/src/api/endpoints/aggregation/posts/likes.js
+++ b/src/api/endpoints/aggregation/posts/likes.ts
@@ -3,7 +3,7 @@
 /**
  * Module dependencies
  */
-import * as mongo from 'mongodb';
+import it from '../../../it';
 import Post from '../../../models/post';
 import Like from '../../../models/like';
 
@@ -17,14 +17,12 @@ module.exports = (params) =>
 	new Promise(async (res, rej) =>
 {
 	// Get 'post_id' parameter
-	const postId = params.post_id;
-	if (postId === undefined || postId === null) {
-		return rej('post_id is required');
-	}
+	const [postId, postIdErr] = it(params.post_id).expect.id().required().qed();
+	if (postIdErr) return rej('invalid post_id param');
 
 	// Lookup post
 	const post = await Post.findOne({
-		_id: new mongo.ObjectID(postId)
+		_id: postId
 	});
 
 	if (post === null) {
diff --git a/src/api/endpoints/aggregation/posts/reply.js b/src/api/endpoints/aggregation/posts/reply.ts
similarity index 88%
rename from src/api/endpoints/aggregation/posts/reply.js
rename to src/api/endpoints/aggregation/posts/reply.ts
index 9d051c659..1f936bbc2 100644
--- a/src/api/endpoints/aggregation/posts/reply.js
+++ b/src/api/endpoints/aggregation/posts/reply.ts
@@ -3,7 +3,7 @@
 /**
  * Module dependencies
  */
-import * as mongo from 'mongodb';
+import it from '../../../it';
 import Post from '../../../models/post';
 
 /**
@@ -16,14 +16,12 @@ module.exports = (params) =>
 	new Promise(async (res, rej) =>
 {
 	// Get 'post_id' parameter
-	const postId = params.post_id;
-	if (postId === undefined || postId === null) {
-		return rej('post_id is required');
-	}
+	const [postId, postIdErr] = it(params.post_id).expect.id().required().qed();
+	if (postIdErr) return rej('invalid post_id param');
 
 	// Lookup post
 	const post = await Post.findOne({
-		_id: new mongo.ObjectID(postId)
+		_id: postId
 	});
 
 	if (post === null) {
diff --git a/src/api/endpoints/aggregation/posts/repost.js b/src/api/endpoints/aggregation/posts/repost.ts
similarity index 88%
rename from src/api/endpoints/aggregation/posts/repost.js
rename to src/api/endpoints/aggregation/posts/repost.ts
index 01899ecea..e4a1bf7c7 100644
--- a/src/api/endpoints/aggregation/posts/repost.js
+++ b/src/api/endpoints/aggregation/posts/repost.ts
@@ -3,7 +3,7 @@
 /**
  * Module dependencies
  */
-import * as mongo from 'mongodb';
+import it from '../../../it';
 import Post from '../../../models/post';
 
 /**
@@ -16,14 +16,12 @@ module.exports = (params) =>
 	new Promise(async (res, rej) =>
 {
 	// Get 'post_id' parameter
-	const postId = params.post_id;
-	if (postId === undefined || postId === null) {
-		return rej('post_id is required');
-	}
+	const [postId, postIdErr] = it(params.post_id).expect.id().required().qed();
+	if (postIdErr) return rej('invalid post_id param');
 
 	// Lookup post
 	const post = await Post.findOne({
-		_id: new mongo.ObjectID(postId)
+		_id: postId
 	});
 
 	if (post === null) {
diff --git a/src/api/endpoints/aggregation/users/followers.js b/src/api/endpoints/aggregation/users/followers.ts
similarity index 88%
rename from src/api/endpoints/aggregation/users/followers.js
rename to src/api/endpoints/aggregation/users/followers.ts
index 3b8d1d604..9336a102f 100644
--- a/src/api/endpoints/aggregation/users/followers.js
+++ b/src/api/endpoints/aggregation/users/followers.ts
@@ -3,7 +3,7 @@
 /**
  * Module dependencies
  */
-import * as mongo from 'mongodb';
+import it from '../../../it';
 import User from '../../../models/user';
 import Following from '../../../models/following';
 
@@ -17,14 +17,12 @@ module.exports = (params) =>
 	new Promise(async (res, rej) =>
 {
 	// Get 'user_id' parameter
-	const userId = params.user_id;
-	if (userId === undefined || userId === null) {
-		return rej('user_id is required');
-	}
+	const [userId, userIdErr] = it(params.user_id).expect.id().required().qed();
+	if (userIdErr) return rej('invalid user_id param');
 
 	// Lookup user
 	const user = await User.findOne({
-		_id: new mongo.ObjectID(userId)
+		_id: userId
 	}, {
 		fields: {
 			_id: true
diff --git a/src/api/endpoints/aggregation/users/following.js b/src/api/endpoints/aggregation/users/following.ts
similarity index 88%
rename from src/api/endpoints/aggregation/users/following.js
rename to src/api/endpoints/aggregation/users/following.ts
index 0b04ff954..d46822915 100644
--- a/src/api/endpoints/aggregation/users/following.js
+++ b/src/api/endpoints/aggregation/users/following.ts
@@ -3,7 +3,7 @@
 /**
  * Module dependencies
  */
-import * as mongo from 'mongodb';
+import it from '../../../it';
 import User from '../../../models/user';
 import Following from '../../../models/following';
 
@@ -17,14 +17,12 @@ module.exports = (params) =>
 	new Promise(async (res, rej) =>
 {
 	// Get 'user_id' parameter
-	const userId = params.user_id;
-	if (userId === undefined || userId === null) {
-		return rej('user_id is required');
-	}
+	const [userId, userIdErr] = it(params.user_id).expect.id().required().qed();
+	if (userIdErr) return rej('invalid user_id param');
 
 	// Lookup user
 	const user = await User.findOne({
-		_id: new mongo.ObjectID(userId)
+		_id: userId
 	}, {
 		fields: {
 			_id: true
diff --git a/src/api/endpoints/aggregation/users/like.js b/src/api/endpoints/aggregation/users/like.ts
similarity index 88%
rename from src/api/endpoints/aggregation/users/like.js
rename to src/api/endpoints/aggregation/users/like.ts
index 0b20dd09a..4a932354a 100644
--- a/src/api/endpoints/aggregation/users/like.js
+++ b/src/api/endpoints/aggregation/users/like.ts
@@ -3,7 +3,7 @@
 /**
  * Module dependencies
  */
-import * as mongo from 'mongodb';
+import it from '../../../it';
 import User from '../../../models/user';
 import Like from '../../../models/like';
 
@@ -17,14 +17,12 @@ module.exports = (params) =>
 	new Promise(async (res, rej) =>
 {
 	// Get 'user_id' parameter
-	const userId = params.user_id;
-	if (userId === undefined || userId === null) {
-		return rej('user_id is required');
-	}
+	const [userId, userIdErr] = it(params.user_id).expect.id().required().qed();
+	if (userIdErr) return rej('invalid user_id param');
 
 	// Lookup user
 	const user = await User.findOne({
-		_id: new mongo.ObjectID(userId)
+		_id: userId
 	}, {
 		fields: {
 			_id: true
diff --git a/src/api/endpoints/aggregation/users/post.js b/src/api/endpoints/aggregation/users/post.ts
similarity index 92%
rename from src/api/endpoints/aggregation/users/post.js
rename to src/api/endpoints/aggregation/users/post.ts
index 01082801e..b62dd6ec9 100644
--- a/src/api/endpoints/aggregation/users/post.js
+++ b/src/api/endpoints/aggregation/users/post.ts
@@ -3,7 +3,7 @@
 /**
  * Module dependencies
  */
-import * as mongo from 'mongodb';
+import it from '../../../it';
 import User from '../../../models/user';
 import Post from '../../../models/post';
 
@@ -17,14 +17,12 @@ module.exports = (params) =>
 	new Promise(async (res, rej) =>
 {
 	// Get 'user_id' parameter
-	const userId = params.user_id;
-	if (userId === undefined || userId === null) {
-		return rej('user_id is required');
-	}
+	const [userId, userIdErr] = it(params.user_id).expect.id().required().qed();
+	if (userIdErr) return rej('invalid user_id param');
 
 	// Lookup user
 	const user = await User.findOne({
-		_id: new mongo.ObjectID(userId)
+		_id: userId
 	}, {
 		fields: {
 			_id: true