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Showing content from https://docs.aws.amazon.com/AWSCloudFormation/latest/APIReference/API_ValidateTemplate.html below:

ValidateTemplate - AWS CloudFormation

ValidateTemplate

Validates a specified template. CloudFormation first checks if the template is valid JSON. If it isn't, CloudFormation checks if the template is valid YAML. If both these checks fail, CloudFormation returns a template validation error.

Request Parameters

For information about the parameters that are common to all actions, see Common Parameters.

TemplateBody

Structure that contains the template body with a minimum length of 1 byte and a maximum length of 51,200 bytes.

Conditional: You must pass TemplateURL or TemplateBody. If both are passed, only TemplateBody is used.

Type: String

Length Constraints: Minimum length of 1.

Required: No

TemplateURL

The URL of a file that contains the template body. The URL must point to a template (max size: 1 MB) that is located in an Amazon S3 bucket or a Systems Manager document. The location for an Amazon S3 bucket must start with https://.

Conditional: You must pass TemplateURL or TemplateBody. If both are passed, only TemplateBody is used.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 5120.

Required: No

Response Elements

The following elements are returned by the service.

Capabilities.member.N

The capabilities found within the template. If your template contains IAM resources, you must specify the CAPABILITY_IAM or CAPABILITY_NAMED_IAM value for this parameter when you use the CreateStack or UpdateStack actions with your template; otherwise, those actions return an InsufficientCapabilities error.

For more information, see Acknowledging IAM resources in CloudFormation templates.

Type: Array of strings

Valid Values: CAPABILITY_IAM | CAPABILITY_NAMED_IAM | CAPABILITY_AUTO_EXPAND

CapabilitiesReason

The list of resources that generated the values in the Capabilities response element.

Type: String

DeclaredTransforms.member.N

A list of the transforms that are declared in the template.

Type: Array of strings

Description

The description found within the template.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 1024.

Parameters.member.N

A list of TemplateParameter structures.

Type: Array of TemplateParameter objects

Errors

For information about the errors that are common to all actions, see Common Errors.

Examples ValidateTemplate

This example illustrates one usage of ValidateTemplate.

Sample Request


https://cloudformation.us-east-1.amazonaws.com/
 ?Action=ValidateTemplate
 &TemplateBody=http://myTemplateRepository/TemplateOne.template
 &Version=2010-05-15
 &SignatureVersion=2
 &Timestamp=2010-07-27T22%3A26%3A28.000Z
 &AWSAccessKeyId=[AWS Access KeyID]
 &Signature=[Signature]

Sample Response


<ValidateTemplateResponse xmlns="http://cloudformation.amazonaws.com/doc/2010-05-15/">
  <ValidateTemplateResult>
    <Description></Description>
    <Parameters>
      <member>
        <NoEcho>false</NoEcho>
        <ParameterKey>InstanceType</ParameterKey>
        <Description>Type of instance to launch</Description>
        <DefaultValue>m1.small</DefaultValue>
      </member>
      <member>
        <NoEcho>false</NoEcho>
        <ParameterKey>WebServerPort</ParameterKey>
        <Description>The TCP port for the Web Server</Description>
        <DefaultValue>8888</DefaultValue>
      </member>
      <member>
        <NoEcho>false</NoEcho>
        <ParameterKey>KeyName</ParameterKey>
        <Description>Name of an existing EC2 KeyPair to enable SSH access into the server</Description>
      </member>
    </Parameters>
  </ValidateTemplateResult>
  <ResponseMetadata>
    <RequestId>0be7b6e8-e4a0-11e0-a5bd-example</RequestId>
  </ResponseMetadata>
</ValidateTemplateResponse>