Menu
AWS CloudFormation
API Reference (API Version 2010-05-15)

ValidateTemplate

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

Request Parameters

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

TemplateBody

Structure containing the template body with a minimum length of 1 byte and a maximum length of 51,200 bytes. For more information, go to Template Anatomy in the AWS CloudFormation User Guide.

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

Location of file containing the template body. The URL must point to a template (max size: 460,800 bytes) that is located in an Amazon S3 bucket. For more information, go to Template Anatomy in the AWS CloudFormation User Guide.

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 1024.

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 AWS CloudFormation Templates.

Type: Array of strings

Valid Values: CAPABILITY_IAM | CAPABILITY_NAMED_IAM

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.

Example

ValidateTemplate

Sample Request

Copy
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

Copy
<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>

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following: