diff --git a/packages/backend/src/errors/already-processed.ts b/packages/backend/src/errors/already-processed.js
similarity index 100%
rename from packages/backend/src/errors/already-processed.ts
rename to packages/backend/src/errors/already-processed.js
diff --git a/packages/backend/src/errors/base.ts b/packages/backend/src/errors/base.js
similarity index 51%
rename from packages/backend/src/errors/base.ts
rename to packages/backend/src/errors/base.js
index 56607322..33dfb57c 100644
--- a/packages/backend/src/errors/base.ts
+++ b/packages/backend/src/errors/base.js
@@ -1,22 +1,22 @@
-import { IJSONObject } from '@automatisch/types';
-
 export default class BaseError extends Error {
   details = {};
-  statusCode?: number;
 
-  constructor(error?: string | IJSONObject) {
-    let computedError: Record<string, unknown>;
+  constructor(error) {
+    let computedError;
+
     try {
-      computedError = JSON.parse(error as string);
+      computedError = JSON.parse(error);
     } catch {
-      computedError = (typeof error === 'string' || Array.isArray(error)) ? { error } : error;
+      computedError =
+        typeof error === 'string' || Array.isArray(error) ? { error } : error;
     }
 
-    let computedMessage: string;
+    let computedMessage;
+
     try {
       // challenge to input to see if it is stringified JSON
-      JSON.parse(error as string);
-      computedMessage = error as string;
+      JSON.parse(error);
+      computedMessage = error;
     } catch {
       if (typeof error === 'string') {
         computedMessage = error;
diff --git a/packages/backend/src/errors/early-exit.ts b/packages/backend/src/errors/early-exit.js
similarity index 100%
rename from packages/backend/src/errors/early-exit.ts
rename to packages/backend/src/errors/early-exit.js
diff --git a/packages/backend/src/errors/generate-auth-url.js b/packages/backend/src/errors/generate-auth-url.js
new file mode 100644
index 00000000..734a3001
--- /dev/null
+++ b/packages/backend/src/errors/generate-auth-url.js
@@ -0,0 +1,10 @@
+import BaseError from './base';
+
+export default class GenerateAuthUrlError extends BaseError {
+  constructor(error) {
+    const computedError = error.response?.data || error.message;
+    super(computedError);
+
+    this.message = `Error occured while creating authorization URL!`;
+  }
+}
diff --git a/packages/backend/src/errors/generate-auth-url.ts b/packages/backend/src/errors/generate-auth-url.ts
deleted file mode 100644
index 630f2bcf..00000000
--- a/packages/backend/src/errors/generate-auth-url.ts
+++ /dev/null
@@ -1,14 +0,0 @@
-import { IJSONObject } from '@automatisch/types';
-import BaseError from './base';
-
-export default class GenerateAuthUrlError extends BaseError {
-  constructor(error: IJSONObject) {
-    const computedError =
-      ((error.response as IJSONObject)?.data as IJSONObject) ||
-      (error.message as string);
-
-    super(computedError);
-
-    this.message = `Error occured while creating authorization URL!`;
-  }
-}
diff --git a/packages/backend/src/errors/http.js b/packages/backend/src/errors/http.js
new file mode 100644
index 00000000..0a3ac8f1
--- /dev/null
+++ b/packages/backend/src/errors/http.js
@@ -0,0 +1,10 @@
+import BaseError from './base';
+
+export default class HttpError extends BaseError {
+  constructor(error) {
+    const computedError = error.response?.data || error.message;
+    super(computedError);
+
+    this.response = error.response;
+  }
+}
diff --git a/packages/backend/src/errors/http.ts b/packages/backend/src/errors/http.ts
deleted file mode 100644
index d7a38e13..00000000
--- a/packages/backend/src/errors/http.ts
+++ /dev/null
@@ -1,17 +0,0 @@
-import type { AxiosResponse, AxiosError } from 'axios';
-import { IJSONObject } from '@automatisch/types';
-import BaseError from './base';
-
-export default class HttpError extends BaseError {
-  response: AxiosResponse;
-
-  constructor(error: AxiosError) {
-    const computedError =
-      error.response?.data as IJSONObject ||
-      error.message as string;
-
-    super(computedError);
-
-    this.response = error.response;
-  }
-}
diff --git a/packages/backend/src/errors/quote-exceeded.ts b/packages/backend/src/errors/quote-exceeded.js
similarity index 100%
rename from packages/backend/src/errors/quote-exceeded.ts
rename to packages/backend/src/errors/quote-exceeded.js
diff --git a/packages/backend/src/helpers/error-handler.ts b/packages/backend/src/helpers/error-handler.js
similarity index 63%
rename from packages/backend/src/helpers/error-handler.ts
rename to packages/backend/src/helpers/error-handler.js
index e96117c5..910e92e5 100644
--- a/packages/backend/src/helpers/error-handler.ts
+++ b/packages/backend/src/helpers/error-handler.js
@@ -1,15 +1,7 @@
-import { NextFunction, Request, Response } from 'express';
 import logger from './logger';
 
-import BaseError from '../errors/base';
-
 // Do not remove `next` argument as the function signature will not fit for an error handler middleware
-const errorHandler = (
-  err: BaseError,
-  req: Request,
-  res: Response,
-  next: NextFunction
-): void => {
+const errorHandler = (err, req, res, next) => {
   if (err.message === 'Not Found') {
     res.status(404).end();
   } else {
diff --git a/packages/backend/src/services/action.ts b/packages/backend/src/services/action.js
similarity index 93%
rename from packages/backend/src/services/action.ts
rename to packages/backend/src/services/action.js
index e873ab4b..33c45bcf 100644
--- a/packages/backend/src/services/action.ts
+++ b/packages/backend/src/services/action.js
@@ -9,13 +9,7 @@ import HttpError from '../errors/http';
 import EarlyExitError from '../errors/early-exit';
 import AlreadyProcessedError from '../errors/already-processed';
 
-type ProcessActionOptions = {
-  flowId: string;
-  executionId: string;
-  stepId: string;
-};
-
-export const processAction = async (options: ProcessActionOptions) => {
+export const processAction = async (options) => {
   const { flowId, stepId, executionId } = options;
 
   const flow = await Flow.query().findById(flowId).throwIfNotFound();
diff --git a/packages/backend/src/services/flow.ts b/packages/backend/src/services/flow.js
similarity index 91%
rename from packages/backend/src/services/flow.ts
rename to packages/backend/src/services/flow.js
index c7382d46..769fcd3b 100644
--- a/packages/backend/src/services/flow.ts
+++ b/packages/backend/src/services/flow.js
@@ -5,12 +5,7 @@ import AlreadyProcessedError from '../errors/already-processed';
 import HttpError from '../errors/http';
 import { logger } from '../helpers/logger';
 
-type ProcessFlowOptions = {
-  flowId: string;
-  testRun?: boolean;
-};
-
-export const processFlow = async (options: ProcessFlowOptions) => {
+export const processFlow = async (options) => {
   const { testRun, flowId } = options;
   const flow = await Flow.query().findById(flowId).throwIfNotFound();
   const triggerStep = await flow.getTriggerStep();
diff --git a/packages/backend/src/services/test-run.ts b/packages/backend/src/services/test-run.js
similarity index 85%
rename from packages/backend/src/services/test-run.ts
rename to packages/backend/src/services/test-run.js
index 4d18028d..dd19b4af 100644
--- a/packages/backend/src/services/test-run.ts
+++ b/packages/backend/src/services/test-run.js
@@ -1,13 +1,9 @@
 import Step from '../models/step';
-import { processFlow } from '../services/flow';
-import { processTrigger } from '../services/trigger';
-import { processAction } from '../services/action';
+import { processFlow } from './flow';
+import { processTrigger } from './trigger';
+import { processAction } from './action';
 
-type TestRunOptions = {
-  stepId: string;
-};
-
-const testRun = async (options: TestRunOptions) => {
+const testRun = async (options) => {
   const untilStep = await Step.query()
     .findById(options.stepId)
     .throwIfNotFound();
diff --git a/packages/backend/src/services/trigger.ts b/packages/backend/src/services/trigger.js
similarity index 79%
rename from packages/backend/src/services/trigger.ts
rename to packages/backend/src/services/trigger.js
index 8cfdc974..f9c37432 100644
--- a/packages/backend/src/services/trigger.ts
+++ b/packages/backend/src/services/trigger.js
@@ -1,18 +1,9 @@
-import { IJSONObject, ITriggerItem } from '@automatisch/types';
 import Step from '../models/step';
 import Flow from '../models/flow';
 import Execution from '../models/execution';
 import globalVariable from '../helpers/global-variable';
 
-type ProcessTriggerOptions = {
-  flowId: string;
-  stepId: string;
-  triggerItem?: ITriggerItem;
-  error?: IJSONObject;
-  testRun?: boolean;
-};
-
-export const processTrigger = async (options: ProcessTriggerOptions) => {
+export const processTrigger = async (options) => {
   const { flowId, stepId, triggerItem, error, testRun } = options;
 
   const step = await Step.query().findById(stepId).throwIfNotFound();