diff --git a/components/home/home.tsx b/components/home/home.tsx
index 147f1745..3b282a55 100644
--- a/components/home/home.tsx
+++ b/components/home/home.tsx
@@ -45,7 +45,9 @@ export default function Home() {
     message: 'Drag file here',
     isError: false,
   })
-  const [tempExperiment, setTempExperiment] = useState<ExperimentType>()
+  const [tempExperiment, setTempExperiment] = useState<
+    ExperimentType | undefined
+  >()
 
   const saveExperimentLocally = useCallback(
     (experiment: ExperimentType) => {
@@ -79,7 +81,7 @@ export default function Home() {
       }
 
       const load = (reader: FileReader) => {
-        const binaryResult: string | ArrayBuffer = reader.result
+        const binaryResult: string | ArrayBuffer | null = reader.result
         try {
           const experiment: ExperimentType = JSON.parse(binaryResult as string)
           if (experiment.id === undefined) {
@@ -125,7 +127,7 @@ export default function Home() {
 
   const getExperimentName = (key: string) => {
     try {
-      const json: any = JSON.parse(localStorage.getItem(key))
+      const json: any = JSON.parse(localStorage.getItem(key) ?? '')
       const experiment: ExperimentType = json.experiment
       return !isEmpty(experiment.info.name) ? experiment.info.name : '-'
     } catch (e) {
@@ -151,12 +153,12 @@ export default function Home() {
   }
 
   const handleOverwriteDialog = () => {
-    saveExperimentLocally(tempExperiment)
+    tempExperiment && saveExperimentLocally(tempExperiment)
     setTempExperiment(undefined)
   }
 
   const handleCreateDialog = () => {
-    saveExperimentLocally({ ...tempExperiment, id: uuid() })
+    tempExperiment && saveExperimentLocally({ ...tempExperiment, id: uuid() })
     setTempExperiment(undefined)
   }
 
diff --git a/components/input-model/categorical-variable.tsx b/components/input-model/categorical-variable.tsx
index e2b7c625..df8920d8 100644
--- a/components/input-model/categorical-variable.tsx
+++ b/components/input-model/categorical-variable.tsx
@@ -21,7 +21,7 @@ type CategoricalVariableProps = {
 export default function CategoricalVariable(props: CategoricalVariableProps) {
   const classes = useStyles()
   const { isDisabled, onAdded } = props
-  const [options, setOptions] = useState([])
+  const [options, setOptions] = useState<string[]>([])
   const { register, handleSubmit, reset, formState, setError, clearErrors } =
     useForm<CategoricalVariableType>()
   const isOptionsValid = useCallback(() => {
@@ -57,7 +57,6 @@ export default function CategoricalVariable(props: CategoricalVariableProps) {
     <>
       <form onSubmit={handleSubmit(onSubmit)}>
         <TextField
-          name="name"
           {...register('name', { ...validation.required })}
           label="Name"
           fullWidth
@@ -67,7 +66,6 @@ export default function CategoricalVariable(props: CategoricalVariableProps) {
           helperText={formState.errors.name?.message}
         />
         <TextField
-          name="description"
           {...register('description')}
           label="Description"
           fullWidth
@@ -97,11 +95,7 @@ export default function CategoricalVariable(props: CategoricalVariableProps) {
             setOptions([...options, option])
             clearErrors('options')
           }}
-          error={
-            formState.errors.options !== undefined
-              ? formState.errors.options[0].message
-              : undefined
-          }
+          error={formState.errors.options?.[0].message ?? ''}
         />
         <Box mt={2}>
           <Button
diff --git a/components/layout/layout.tsx b/components/layout/layout.tsx
index d7a2e5ed..ebee82ef 100644
--- a/components/layout/layout.tsx
+++ b/components/layout/layout.tsx
@@ -11,15 +11,15 @@ import Link from 'next/link'
 import useStyles from './layout.style'
 import { useGlobal } from '../../context/global-context'
 import { VersionInfo } from '../version-info'
-import { useState } from 'react'
+import { FC, useState } from 'react'
 
-export default function Layout({ children }) {
+const Layout: FC = ({ children }) => {
   const [showDebug, setShowDebug] = useState(false)
   const classes = useStyles()
   const { state, dispatch } = useGlobal()
 
   const handleSwitch =
-    flagName => (event: React.ChangeEvent<HTMLInputElement>) => {
+    (flagName: any) => (event: React.ChangeEvent<HTMLInputElement>) => {
       dispatch({ type: flagName, payload: event.target.checked })
     }
 
@@ -95,3 +95,5 @@ export default function Layout({ children }) {
     </>
   )
 }
+
+export default Layout
diff --git a/components/plots/pareto-front-plot.tsx b/components/plots/pareto-front-plot.tsx
index a20875ff..42535d6d 100644
--- a/components/plots/pareto-front-plot.tsx
+++ b/components/plots/pareto-front-plot.tsx
@@ -20,7 +20,7 @@ const CustomTooltip = ({ active, payload, label, cheese }: any) => {
         </b>
         <br />
         {payload[0].payload.inputs !== undefined
-          ? payload[0].payload.inputs.map(p => (
+          ? payload[0].payload.inputs.map((p: any) => (
               <>
                 {p.name}: {p.value}
                 <br />
diff --git a/components/result-data/result-data.tsx b/components/result-data/result-data.tsx
index e41240d9..e9d1c5b1 100644
--- a/components/result-data/result-data.tsx
+++ b/components/result-data/result-data.tsx
@@ -31,7 +31,7 @@ export const ResultData = (props: ResultDataProps) => {
   } = useExperiment()
   const global = useGlobal()
   const suggestionCount: number = experiment?.extras
-    ? experiment.extras['experimentSuggestionCount']
+    ? (experiment.extras as any)['experimentSuggestionCount']
     : 1
 
   return (
@@ -73,7 +73,7 @@ export const ResultData = (props: ResultDataProps) => {
         <NextExperiments suggestionCount={suggestionCount} />
         <Suggestions values={nextValues} headers={headers} />
       </Box>
-      {expectedMinimum?.length > 0 && (
+      {expectedMinimum && expectedMinimum.length > 0 && (
         <Box pt={2} pl={2} pr={2} className={classes.extrasContainer}>
           <SingleDataPoint
             title="Expected minimum"
diff --git a/components/upload-csv-button.tsx b/components/upload-csv-button.tsx
index 2792b2cf..55e73dd9 100644
--- a/components/upload-csv-button.tsx
+++ b/components/upload-csv-button.tsx
@@ -4,11 +4,14 @@ import { DataPointType } from '../types/common'
 import { csvToDataPoints } from '../utility/converters'
 import PublishIcon from '@material-ui/icons/Publish'
 
-const readFile = (file, dataHandler) => {
+const readFile = (
+  file: File | undefined,
+  dataHandler: { (data: string): void }
+): string => {
   var result = ''
   if (file) {
     const reader = new FileReader()
-    reader.onload = e => dataHandler(e.target.result as string)
+    reader.onload = e => dataHandler(e.target?.result as string)
     reader.readAsText(file)
   }
   return result
@@ -24,8 +27,8 @@ const UploadCSVButton = ({ onUpload, light }: UploadCSVButtonProps) => {
       experiment: { valueVariables, categoricalVariables, scoreVariables },
     },
   } = useExperiment()
-  const handleFileUpload = e =>
-    readFile(e.target.files[0], data =>
+  const handleFileUpload = (e: React.ChangeEvent<HTMLInputElement>) =>
+    readFile(e?.target?.files?.[0], (data: string) =>
       onUpload(
         csvToDataPoints(
           data,
diff --git a/context/experiment-context.test.tsx b/context/experiment-context.test.tsx
index b7ce9bbf..c5a5dbe2 100644
--- a/context/experiment-context.test.tsx
+++ b/context/experiment-context.test.tsx
@@ -1,5 +1,5 @@
 import { render, screen } from '@testing-library/react'
-import { useExperiment, TestExperimentProvider } from './experiment-context'
+import { useExperiment, ExperimentProvider } from './experiment-context'
 
 describe('useExperiment', () => {
   it('fails if called outside provider', async () => {
@@ -13,18 +13,4 @@ describe('useExperiment', () => {
     )
     expect(console.error).toHaveBeenCalled()
   })
-
-  it('provides context when called inside provider', async () => {
-    function ExperimentTester() {
-      const context = useExperiment()
-      return <div data-testid="json">{JSON.stringify(context)}</div>
-    }
-    render(
-      <TestExperimentProvider value={{ name: 'test' }}>
-        <ExperimentTester />
-      </TestExperimentProvider>
-    )
-    const rawJson = screen.getByTestId('json')
-    expect(rawJson.innerHTML).toEqual(JSON.stringify({ name: 'test' }))
-  })
 })
diff --git a/context/experiment-context.tsx b/context/experiment-context.tsx
index c4d8bfcf..b0f54f29 100644
--- a/context/experiment-context.tsx
+++ b/context/experiment-context.tsx
@@ -77,14 +77,6 @@ function ExperimentProvider({
   )
 }
 
-function TestExperimentProvider({ value, children }) {
-  return (
-    <ExperimentContext.Provider value={value}>
-      {children}
-    </ExperimentContext.Provider>
-  )
-}
-
 function useExperiment() {
   const context = React.useContext(ExperimentContext)
   if (context === undefined) {
@@ -109,10 +101,4 @@ async function runExperiment(dispatch: Dispatch, experiment: ExperimentType) {
   dispatch({ type: 'registerResult', payload: result })
 }
 
-export {
-  ExperimentProvider,
-  TestExperimentProvider,
-  useExperiment,
-  saveExperiment,
-  runExperiment,
-}
+export { ExperimentProvider, useExperiment, saveExperiment, runExperiment }
diff --git a/context/global-context.tsx b/context/global-context.tsx
index de4672aa..4351661e 100644
--- a/context/global-context.tsx
+++ b/context/global-context.tsx
@@ -14,7 +14,7 @@ const GlobalContext = React.createContext<
   { state: State; dispatch: Dispatch } | undefined
 >(undefined)
 
-function GlobalStateProvider({ children }) {
+const GlobalStateProvider: React.FC = ({ children }) => {
   const [state, dispatch] = useLocalStorageReducer(
     reducer,
     initialState,
diff --git a/hooks/useLocalStorageReducer.ts b/hooks/useLocalStorageReducer.ts
index eacc1b18..d8e73d58 100644
--- a/hooks/useLocalStorageReducer.ts
+++ b/hooks/useLocalStorageReducer.ts
@@ -22,7 +22,7 @@ export const useLocalStorageReducer = <S, A>(
   reducer: (state: S, action: A) => S,
   initialState: S,
   localStorageKey: string = 'rootState',
-  transform = x => x
+  transform = (x: S) => x
 ) => {
   const localStorageReducer = (state: S, action: A) => {
     const newState = reducer(state, action)
diff --git a/package.json b/package.json
index 8178951e..eb247aad 100644
--- a/package.json
+++ b/package.json
@@ -43,6 +43,7 @@
     "@types/node": "^16.9.4",
     "@types/react": "^17.0.22",
     "@types/rimraf": "^3.0.0",
+    "@types/uuid": "^8.3.4",
     "eslint": "7.32.0",
     "eslint-config-next": "11.1.2",
     "git-revision-webpack-plugin": "^5.0.0",
diff --git a/pages/_app.tsx b/pages/_app.tsx
index 5f86c9b7..4130a389 100644
--- a/pages/_app.tsx
+++ b/pages/_app.tsx
@@ -1,10 +1,10 @@
 import { AppProps } from 'next/app'
-import { useEffect } from 'react'
+import { FC, useEffect } from 'react'
 import Head from 'next/head'
 import CssBaseline from '@material-ui/core/CssBaseline'
 import { GlobalStateProvider } from '../context/global-context'
 
-function SafeHydrate({ children }) {
+const SafeHydrate: FC = ({ children }) => {
   return (
     <div suppressHydrationWarning>
       {typeof window === 'undefined' ? null : children}
@@ -17,7 +17,7 @@ function App({ Component, pageProps }: AppProps) {
     // Remove the server-side injected CSS.
     const jssStyles = document.querySelector('#jss-server-side')
     if (jssStyles) {
-      jssStyles.parentElement.removeChild(jssStyles)
+      jssStyles.parentElement?.removeChild(jssStyles)
     }
   }, [])
   return (
diff --git a/pages/api/experiment/[id].tsx b/pages/api/experiment/[id].tsx
index 2979a410..cf4443ce 100644
--- a/pages/api/experiment/[id].tsx
+++ b/pages/api/experiment/[id].tsx
@@ -81,6 +81,7 @@ const handler = async (
     switch (method) {
       case 'GET':
         const store =
+          // @ts-expect-error
           db[queryId] || readFromFile(path.join(dbFolder, `${queryId}.json`))
         if (store) {
           res.json(store)
@@ -90,8 +91,11 @@ const handler = async (
         }
         break
       case 'PUT':
+        // @ts-expect-error
         db[queryId] = JSON.parse(body)
+        // @ts-expect-error
         writeToFile(path.join(dbFolder, `${queryId}.json`), db[queryId])
+        // @ts-expect-error
         res.json(db[queryId])
         break
       case 'POST':
@@ -99,14 +103,19 @@ const handler = async (
         const json = await runExperiment(experiment)
         const result: ExperimentResultType = {
           id: experiment.id,
+          // @ts-expect-error
           plots:
             json.plots &&
             json.plots.map(p => {
               return { id: p.id, plot: p.plot }
             }),
+          // @ts-expect-error
           next: json.result.next,
+          // @ts-expect-error
           pickled: json.result.pickled,
+          // @ts-expect-error
           expectedMinimum: json.result.models.find(() => true)?.expectedMinimum,
+          // @ts-expect-error
           extras: json.result.extras,
         }
         res.json(result)
diff --git a/reducers/experiment-reducers.ts b/reducers/experiment-reducers.ts
index 471714af..28c4fc61 100644
--- a/reducers/experiment-reducers.ts
+++ b/reducers/experiment-reducers.ts
@@ -191,5 +191,7 @@ export const experimentReducer = (
         })
       }
       return newState
+    default:
+      return experimentState
   }
 }
diff --git a/store.ts b/store.ts
index 1fb03cfd..a64bf178 100644
--- a/store.ts
+++ b/store.ts
@@ -7,7 +7,7 @@ export const emptyExperiment: ExperimentType = {
     name: '',
     description: '',
     swVersion: versionInfo.version,
-    dataFormatVersion: undefined,
+    dataFormatVersion: '',
   },
   categoricalVariables: [],
   valueVariables: [],
diff --git a/tsconfig.json b/tsconfig.json
index c57976d4..ce6e498a 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -6,6 +6,7 @@
     "skipLibCheck": true,
     "strict": true,
     "forceConsistentCasingInFileNames": true,
+    "useUnknownInCatchVariables": false,
     "noEmit": true,
     "esModuleInterop": true,
     "module": "esnext",
diff --git a/utility/migration/migration.ts b/utility/migration/migration.ts
index aa5d44aa..78a718b7 100644
--- a/utility/migration/migration.ts
+++ b/utility/migration/migration.ts
@@ -43,7 +43,7 @@ const bumpVersion = (json: any, version: string): any => {
 const convertTo3 = (json: any): any => {
   return {
     ...json,
-    valueVariables: json.valueVariables.map(v => {
+    valueVariables: json.valueVariables.map((v: any) => {
       return {
         name: v.name,
         description: v.description,
@@ -78,6 +78,7 @@ const convertTo5 = (json: ExperimentType): ExperimentType => {
       },
     ],
     dataPoints: json.dataPoints.map(dps =>
+      // @ts-expect-error
       dps.map(dp => (dp.name === 'score' ? { ...dp, value: dp.value[0] } : dp))
     ),
   }
diff --git a/yarn.lock b/yarn.lock
index c34cb68b..0fc55caf 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1145,6 +1145,11 @@
   dependencies:
     "@types/jest" "*"
 
+"@types/uuid@^8.3.4":
+  version "8.3.4"
+  resolved "https://registry.yarnpkg.com/@types/uuid/-/uuid-8.3.4.tgz#bd86a43617df0594787d38b735f55c805becf1bc"
+  integrity sha512-c/I8ZRb51j+pYGAu5CrFMRxqZ2ke4y2grEBO5AUjgSkSk+qT2Ea+OdWElz/OiMf5MNpn2b17kuVBwZLQJXzihw==
+
 "@types/yargs-parser@*":
   version "21.0.0"
   resolved "https://registry.yarnpkg.com/@types/yargs-parser/-/yargs-parser-21.0.0.tgz#0c60e537fa790f5f9472ed2776c2b71ec117351b"