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agent-doc OpenCode https://opencode.ai/docs/web/ 2026-04-28T21:02:15.096190+00:00 24c746a2

Web

Using OpenCode in your browser.

OpenCode can run as a web application in your browser, providing the same powerful AI coding experience without needing a terminal.

Getting Started

Start the web interface by running:

opencode web

This starts a local server on 127.0.0.1 with a random available port and automatically opens OpenCode in your default browser.


Configuration

You can configure the web server using command line flags or in your config file.

Port

By default, OpenCode picks an available port. You can specify a port:

opencode web --port 4096

Hostname

By default, the server binds to 127.0.0.1 (localhost only). To make OpenCode accessible on your network:

opencode web --hostname 0.0.0.0

When using 0.0.0.0, OpenCode will display both local and network addresses:

  Local access:       http://localhost:4096  Network access:     http://192.168.1.100:4096

mDNS Discovery

Enable mDNS to make your server discoverable on the local network:

opencode web --mdns

This automatically sets the hostname to 0.0.0.0 and advertises the server as opencode.local.

You can customize the mDNS domain name to run multiple instances on the same network:

opencode web --mdns --mdns-domain myproject.local

CORS

To allow additional domains for CORS (useful for custom frontends):

opencode web --cors https://example.com

Authentication

To protect access, set a password using the OPENCODE_SERVER_PASSWORD environment variable:

OPENCODE_SERVER_PASSWORD=secret opencode web

The username defaults to opencode but can be changed with OPENCODE_SERVER_USERNAME.


Using the Web Interface

Once started, the web interface provides access to your OpenCode sessions.

Sessions

View and manage your sessions from the homepage. You can see active sessions and start new ones.

Server Status

Click “See Servers” to view connected servers and their status.


Attaching a Terminal

You can attach a terminal TUI to a running web server:

# Start the web serveropencode web --port 4096
# In another terminal, attach the TUIopencode attach http://localhost:4096

This allows you to use both the web interface and terminal simultaneously, sharing the same sessions and state.


Config File

You can also configure server settings in your opencode.json config file:

{  "server": {    "port": 4096,    "hostname": "0.0.0.0",    "mdns": true,    "cors": ["https://example.com"]  }}

Command line flags take precedence over config file settings.