---
title: Deno
description: "Configure Deno language support in Zed, including language servers, formatting, and debugging."
---

# Deno

Deno support is available through the [Deno extension](https://github.com/zed-extensions/deno).

- Language server: [Deno Language Server](https://docs.deno.com/runtime/manual/advanced/language_server/overview/)

## Deno Configuration

To use the Deno Language Server with TypeScript and TSX files, you will likely wish to disable the default language servers and enable Deno.

Configure language servers and formatters in Settings ({#kb zed::OpenSettings}) under Languages > JavaScript/TypeScript/TSX, or add to your settings file:

```json [settings]
{
  "lsp": {
    "deno": {
      "settings": {
        "deno": {
          "enable": true
        }
      }
    }
  },
  "languages": {
    "JavaScript": {
      "language_servers": [
        "deno",
        "!typescript-language-server",
        "!vtsls",
        "!eslint"
      ],
      "formatter": "language_server"
    },
    "TypeScript": {
      "language_servers": [
        "deno",
        "!typescript-language-server",
        "!vtsls",
        "!eslint"
      ],
      "formatter": "language_server"
    },
    "TSX": {
      "language_servers": [
        "deno",
        "!typescript-language-server",
        "!vtsls",
        "!eslint"
      ],
      "formatter": "language_server"
    }
  }
}
```

See [Configuring supported languages](../configuring-languages.md) in the Zed documentation for more information.

<!--
TBD: Deno TypeScript REPL instructions [docs/repl#typescript-deno](../repl.md#typescript-deno)
-->

## Configuration completion

To get completions for `deno.json` or `package.json`, add the following to your settings file ([how to edit](../configuring-zed.md#settings-files)). For more details, see [JSON](./json.md).

```json [settings]
"lsp": {
    "json-language-server": {
      "settings": {
        "json": {
          "schemas": [
            {
              "fileMatch": [
                "deno.json",
                "deno.jsonc"
              ],
              "url": "https://raw.githubusercontent.com/denoland/deno/refs/heads/main/cli/schemas/config-file.v1.json"
            },
            {
              "fileMatch": [
                "package.json"
              ],
              "url": "https://www.schemastore.org/package"
            }
          ]
        }
      }
    }
  }
```

## DAP support

To debug deno programs, add this to `.zed/debug.json`

```json [debug]
[
  {
    "adapter": "JavaScript",
    "label": "Deno",
    "request": "launch",
    "type": "pwa-node",
    "cwd": "$ZED_WORKTREE_ROOT",
    "program": "$ZED_FILE",
    "runtimeExecutable": "deno",
    "runtimeArgs": ["run", "--allow-all", "--inspect-wait"],
    "attachSimplePort": 9229
  }
]
```

## Runnable support

To run deno tasks like tests from the ui, add this to `.zed/tasks.json`

```json [tasks]
[
  {
    "label": "deno test",
    "command": "deno test -A $ZED_FILE",
    "tags": ["js-test"]
  }
]
```

## See also:

- [TypeScript](./typescript.md)
- [JavaScript](./javascript.md)
