---
extractApiHeaders: [2]
---

# Dev Config

This section describes some dev configurations in Modern.js Builder.

## dev.assetPrefix

import AssetPrefix from '@en/config/dev/assetPrefix.md';

<AssetPrefix />

## dev.beforeStartUrl

import BeforeStartUrl from '@en/config/dev/beforeStartUrl.md';

<BeforeStartUrl />

## dev.hmr

import Hmr from '@en/config/dev/hmr.md';

<Hmr />

## dev.host

import Host from '@en/config/dev/host.md';

<Host />

## dev.https

import Https from '@en/config/dev/https.md';

<Https />

## dev.port

import Port from '@en/config/dev/port.md';

<Port />

## dev.progressBar

import ProgressBar from '@en/config/dev/progressBar.md';

<ProgressBar />

## dev.startUrl

import StartUrl from '@en/config/dev/startUrl.md';

<StartUrl />
