---
title: "module.string | Grafana Agent documentation"
description: "Learn about module.string"
---

# module.string (deprecated)

> Caution
> 
> Starting with release v0.40, `module.string` is deprecated and is replaced by `import.string`. `module.string` will be removed in a future release.

> **BETA**: This is a [beta](/docs/agent/latest/stability/#beta) component. Beta components are subject to breaking changes, and may be replaced with equivalent functionality that cover the same use case.

`module.string` is a *module loader* component. A module loader is a Grafana Agent Flow component which retrieves a [module](../../../concepts/modules/) and runs the components defined inside of it.

## Usage

Alloy ![Copy code to clipboard](/media/images/icons/icon-copy-small-2.svg) Copy

```alloy
module.string "LABEL" {
  content = CONTENT

  arguments {
    MODULE_ARGUMENT_1 = VALUE_1
    MODULE_ARGUMENT_2 = VALUE_2
    ...
  }
}
```

## Arguments

The following arguments are supported:

Expand table

| Name      | Type                 | Description                                               | Default | Required |
|-----------|----------------------|-----------------------------------------------------------|---------|----------|
| `content` | `secret` or `string` | The contents of the module to load as a secret or string. |         | yes      |

`content` is a string that contains the configuration of the module to load. `content` is typically loaded by using the exports of another component. For example,

- `local.file.LABEL.content`
- `remote.http.LABEL.content`
- `remote.s3.LABEL.content`

## Blocks

The following blocks are supported inside the definition of `module.string`:

Expand table

| Hierarchy | Block                         | Description                      | Required |
|-----------|-------------------------------|----------------------------------|----------|
| arguments | [arguments](#arguments-block) | Arguments to pass to the module. | no       |

### arguments block

The `arguments` block specifies the list of values to pass to the loaded module.

The attributes provided in the `arguments` block are validated based on the [argument blocks](../../config-blocks/argument/) defined in the module source:

- If a module source marks one of its arguments as required, it must be provided as an attribute in the `arguments` block of the module loader.
- Attributes in the `argument` block of the module loader will be rejected if they are not defined in the module source.

## Exported fields

The following fields are exported and can be referenced by other components:

Expand table

| Name      | Type       | Description                       |
|-----------|------------|-----------------------------------|
| `exports` | `map(any)` | The exports of the Module loader. |

`exports` exposes the `export` config block inside a module. It can be accessed from the parent config via `module.string.LABEL.exports.EXPORT_LABEL`.

Values in `exports` correspond to [export blocks](../../config-blocks/export/) defined in the module source.

## Component health

`module.string` is reported as healthy if the most recent load of the module was successful.

If the module is not loaded successfully, the current health displays as unhealthy and the health includes the error from loading the module.

## Debug information

`module.string` does not expose any component-specific debug information.

## Debug metrics

`module.string` does not expose any component-specific debug metrics.

## Example

In this example, we pass credentials from a parent config to a module which loads a `prometheus.remote_write` component. The exports of the `prometheus.remote_write` component are exposed to parent config, allowing the parent config to pass metrics to it.

Parent:

Alloy ![Copy code to clipboard](/media/images/icons/icon-copy-small-2.svg) Copy

```alloy
local.file "metrics" {
  filename = "/path/to/prometheus_remote_write_module.river"
}

module.string "metrics" {
  content = local.file.metrics.content

  arguments {
    username = env("PROMETHEUS_USERNAME")
    password = env("PROMETHEUS_PASSWORD")
  }
}

prometheus.exporter.unix "default" { }

prometheus.scrape "local_agent" {
  targets         = prometheus.exporter.unix.default.targets
  forward_to      = [module.string.metrics.exports.prometheus_remote_write.receiver]
  scrape_interval = "10s"
}
```

Module:

Alloy ![Copy code to clipboard](/media/images/icons/icon-copy-small-2.svg) Copy

```alloy
argument "username" { }

argument "password" { }

export "prometheus_remote_write" {
  value = prometheus.remote_write.grafana_cloud
}

prometheus.remote_write "grafana_cloud" {
  endpoint {
    url = "https://prometheus-us-central1.grafana.net/api/prom/push"

    basic_auth {
      username = argument.username.value
      password = argument.password.value
    }
  }
}
```