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sing-box/docs/configuration/service/api.md
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2026-06-25 17:39:08 +08:00

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---
icon: material/new-box
---
!!! question "Since sing-box 1.14.0"
# sing-box API
The sing-box API service is a gRPC server for observing and controlling the running sing-box instance.
It can be accessed by the [sing-box graphical clients](/clients/) for iOS, macOS, and
Android (via the Remote Control feature), or the
[sing-box dashboard](https://github.com/SagerNet/sing-box-dashboard).
The server also accepts [gRPC-Web](https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-WEB.md) requests,
including the WebSocket transport of [@improbable-eng/grpc-web](https://github.com/improbable-eng/grpc-web)
for bidirectional streaming methods.
### Structure
```json
{
"type": "api",
... // Listen Fields
"secret": "",
"access_control_allow_origin": [],
"access_control_allow_private_network": false,
"dashboard": {
"enabled": true,
"path": "",
"download_url": "",
"http_client": "", // or {}
"update_interval": ""
},
"tls": {}
}
```
### Listen Fields
See [Listen Fields](/configuration/shared/listen/) for details.
### Fields
#### secret
Secret for the API.
Clients authenticate with the standard `authorization: Bearer <secret>` gRPC metadata header.
If empty, authentication is disabled.
#### access_control_allow_origin
CORS allowed origins, `*` will be used if empty.
#### access_control_allow_private_network
Allow access from private network.
#### dashboard
Web dashboard downloaded and served over the API listener at `/dashboard/`; other browser
requests are redirected to it.
!!! info ""
The object can be replaced with a boolean value (equivalent to `{ "enabled": <bool> }`),
or with a string path (equivalent to `{ "enabled": true, "path": "<string>" }`).
##### enabled
Enable the dashboard.
##### path
Directory the dashboard files are stored in.
`dashboard` in the working directory will be used by default.
If the directory is empty, the dashboard is downloaded and an `.etag` file is stored inside
it to skip unchanged updates. A non-empty directory without an `.etag` file is served as-is
and never updated automatically.
##### download_url
Download URL of the dashboard archive (zip).
`https://github.com/SagerNet/sing-box-dashboard/archive/refs/heads/gh-pages.zip` will be used by default.
##### http_client
HTTP client used to download the dashboard, with the same behavior as remote rule-sets.
See [HTTP Client Fields](/configuration/shared/http-client/) for details.
When empty, the default HTTP client is used: the one named by
[`default_http_client`](/configuration/route/#default_http_client), or the first top-level
`http_clients` entry when `default_http_client` is empty.
!!! failure "Implicit default deprecated in sing-box 1.14.0"
When neither `http_clients` nor `default_http_client` is configured, an implicit HTTP
client connecting through the default outbound is used. This implicit default is
deprecated in sing-box 1.14.0 and will be removed in sing-box 1.16.0; define
`http_clients` instead.
##### update_interval
Update interval of the dashboard.
`1d` will be used by default.
#### tls
TLS configuration, see [TLS](/configuration/shared/tls/#inbound).