title: $:/language/Help/listen
description: Provides an HTTP server interface to TiddlyWiki

Serves a wiki over HTTP.

The listen command uses NamedCommandParameters:

```
--listen [<name>=<value>]...
```

All parameters are optional with safe defaults, and can be specified in any order. The recognised parameters are:

* ''host'' - optional hostname to serve from (defaults to "127.0.0.1" aka "localhost")
* ''path-prefix'' - optional prefix for paths
* ''port'' - port number on which to listen; non-numeric values are interpreted as a system environment variable from which the port number is extracted (defaults to "8080")
* ''credentials'' - pathname of credentials CSV file (relative to wiki folder)
* ''anon-username'' - the username for signing edits for anonymous users
* ''username'' - optional username for basic authentication
* ''password'' - optional password for basic authentication
* ''authenticated-user-header'' - optional name of header to be used for trusted authentication
* ''readers'' - comma separated list of principals allowed to write to this wiki
* ''writers'' - comma separated list of principals allowed to read from this wiki
* ''csrf-disable'' - set to "yes" to disable CSRF checks (defaults to "no")
* ''root-tiddler'' - the tiddler to serve at the root (defaults to "$:/core/save/all")
* ''root-render-type'' - the content type to which the root tiddler should be rendered (defaults to "text/plain")
* ''root-serve-type'' - the content type with which the root tiddler should be served (defaults to "text/html")
* ''tls-cert'' - pathname of TLS certificate file (relative to wiki folder)
* ''tls-key'' - pathname of TLS key file (relative to wiki folder)
* ''debug-level'' - optional debug level; set to "debug" to view request details (defaults to "none")