---
icon: material/new-box
---

!!! question "Since sing-box 1.14.0"

### Structure

```json
{
  "type": "snell",
  "tag": "snell-out",

  "server": "127.0.0.1",
  "server_port": 1080,
  "version": 4,
  "psk": "password",
  "userkey": "",
  "reuse": false,
  "network": "tcp",
  "obfs_mode": "",
  "obfs_host": "",

  ... // Dial Fields
}
```

### Version 6 Structure

```json
{
  "type": "snell",
  "tag": "snell-out",

  "server": "127.0.0.1",
  "server_port": 1080,
  "version": 6,
  "psk": "password",
  "userkey": "",
  "reuse": false,
  "network": "tcp",
  "mode": "",

  ... // Dial Fields
}
```

### Fields

#### server

==Required==

The server address.

#### server_port

==Required==

The server port.

#### version

==Required==

The Snell protocol version, one of `4` `6`.

Version `4` supports HTTP obfuscation (`obfs_mode` / `obfs_host`); version `6`
replaces it with traffic shaping (`mode`) and requires a `psk` of 12 to 255
bytes.

!!! note

    Since we intentionally do not support the QUIC proxy mode of Snell v5, the v5 wire protocol
    is effectively identical to v4, so no separate v4 server or v5 client is provided.

#### psk

==Required==

The pre-shared key.

#### userkey

The user key, used to authenticate against a multi-user server.

#### reuse

Enable connection reuse (the Snell v2 `CONNECT` command).

#### network

Enabled network

One of `tcp` `udp`.

Both is enabled by default.

#### obfs_mode

==Version 4 only==

HTTP obfuscation mode, one of `none` `http`.

`none` is used by default.

#### obfs_host

==Version 4 only==

The HTTP `Host` header sent when `obfs_mode` is `http`.

`bing.com` is used by default.

#### mode

==Version 6 only==

Traffic shaping mode, one of `default` `unshaped` `unsafe-raw`.

`default` is used by default.

### Dial Fields

See [Dial Fields](/configuration/shared/dial/) for details.