consul/website/content/commands/acl/templated-policy/preview.mdx

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---
layout: commands
page_title: 'Commands: ACL Templated Policy Preview'
description: |
The `consul acl templated-policy preview` command previews what resulting generated policy from a templated policy.
---
# Consul ACL Templated Policy Preview
Command: `consul acl templated-policy preview`
Corresponding HTTP API Endpoint: [\[POST\] /v1/acl/templated-policy/preview/:name](/consul/api-docs/acl/templated-policies#preview-a-templated-policy)
Use the `acl templated-policy preview` command to preview the policy generated from a templated policy.
You must provide an ACL token with `acl:read` permissions to use the `consul all templated-policy preview` command.
The command does not support [blocking queries](/consul/api-docs/features/blocking) and [agent caching](/consul/api-docs/features/caching).
## Usage
Usage: `consul acl templated-policy preview [options] [args]`
### Command Options
- `-name`: String value that specifies the templated policy name. Use `-var` flag to specify variables when
required.
- `var`: String value that specifies templated policy variables. Must be used in combination with `-name`
flag to specify required variables. You can use the flag multiple times with different
variables. Format is `VariableName:Value`
- `-file`: String value that specifies the path to a file containing templated policies and variables.
- `-format`: Specifies the output format. You can specify either `pretty` or `json` The default value is `pretty`.
### Enterprise options
@include 'cli-http-api-partition-options.mdx'
@include 'http_api_namespace_options.mdx'
### API options
@include 'http_api_options_client.mdx'
@include 'http_api_options_server.mdx'
## Examples
The following examples demonstrate common patterns for using the `acl templated-policy preview` command.
### Preview a templated policy with no required variables
```shell-session
consul acl templated-policy preview -name "builtin/dns"
ID: 0a6e6f64655f70726566697...
Name: synthetic-policy-0a6e6f...
Description: synthetic policy generated from templated policy: builtin/dns
Datacenters:
Rules:
node_prefix "" {
policy = "read"
}
service_prefix "" {
policy = "read"
}
query_prefix "" {
policy = "read"
}
```
### Preview a templated policy with required variables
In the following example, Consul prints a preview of the policy generated from the `builtin/service` templated policy for the service name `api`.
```shell-session
consul acl templated-policy preview -name "builtin/service" -var "name:api"
ID: 0a736572766963652022617...
Name: synthetic-policy-0a7365...
Description: synthetic policy generated from templated policy: builtin/service
Datacenters:
Rules:
service "api" {
policy = "write"
}
service "api-sidecar-proxy" {
policy = "write"
}
service_prefix "" {
policy = "read"
}
node_prefix "" {
policy = "read"
}
```
### Preview a templated policy using a file:
The following example shows a payload request to preview of the policy generated from the `builtin/service` templated policy.
The payload includes a variable named `web`, which Consul uses as the service name.
#### Sample payload
```hcl
TemplatedPolicy "builtin/service" {
Name = "web"
}
```
```shell-session
$ consul acl templated-policy -file templated-policy.hcl
ID: 0a736572766963652022776...
Name: synthetic-policy-0a7365...
Description: synthetic policy generated from templated policy: builtin/service
Datacenters:
Rules:
service "web" {
policy = "write"
}
service "web-sidecar-proxy" {
policy = "write"
}
service_prefix "" {
policy = "read"
}
node_prefix "" {
policy = "read"
}
```