diff --git a/datasette/cli.py b/datasette/cli.py
index 32266888..370b722c 100644
--- a/datasette/cli.py
+++ b/datasette/cli.py
@@ -223,15 +223,22 @@ pm.hook.publish_subcommand(publish=publish)
 
 @cli.command()
 @click.option("--all", help="Include built-in default plugins", is_flag=True)
+@click.option(
+    "--requirements", help="Output requirements.txt of installed plugins", is_flag=True
+)
 @click.option(
     "--plugins-dir",
     type=click.Path(exists=True, file_okay=False, dir_okay=True),
     help="Path to directory containing custom plugins",
 )
-def plugins(all, plugins_dir):
+def plugins(all, requirements, plugins_dir):
     """List currently installed plugins"""
     app = Datasette([], plugins_dir=plugins_dir)
-    click.echo(json.dumps(app._plugins(all=all), indent=4))
+    if requirements:
+        for plugin in app._plugins():
+            click.echo("{}=={}".format(plugin["name"], plugin["version"]))
+    else:
+        click.echo(json.dumps(app._plugins(all=all), indent=4))
 
 
 @cli.command()

Output:

% datasette plugins --requirements  
datasette-codespaces==0.1.1
datasette-graphql==2.2
datasette-json-html==1.0.1
datasette-pretty-json==0.2.2
datasette-x-forwarded-host==0.1

Uh oh!

[feature request]datasette install plugins.json options #2133

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[feature request]`datasette install plugins.json` options #2133