cfn-lint

Validate AWS CloudFormation yaml/json templates against the AWS CloudFormation resource provider schemas and additional checks.

Runs as cfn-lint|macOS, Linux, Windows|github.com

Open form in Otty otty.toml

Command form

ai-draft · 2 tasks · 9 fields

Check CloudFormation templates against the resource schemas and rules. Custom rules, spec updates and graph options are left out.

Opens the form; the finished command lands at your prompt, unrun

Run in Otty

otty gui cfn-lint

Lint templatesExample values, fixed in this page — nothing here reaches a terminal

Basic

Templates*

file

Output format

6 choicesenum

Advanced

Ignore rules

string

TasksEach one presets the form for one job

Lint a template

templatesformatignore_checks

List rules

list_rules

ParametersOnly these flags are editable in the form

Templates

Template files or globs. Leave empty to use the config file.
path · positional 0 · repeatable

Output format

enum

--format-fquietparseablejsonjunitprettysarif

Regions

Region names, or ALL_REGIONS. Put templates after -- when giving several regions.
string · repeatable

--regions-r

Parameters

Key=Value pairs.
string · repeatable

--parameters

Ignore rules

Rule IDs or prefixes, e.g. W or W2001.
string · repeatable

--ignore-checks-i

Include experimental rules

boolean

--include-experimental-e

Ignore bad templates

boolean

--ignore-bad-template-b

Non-zero exit from

enum

--non-zero-exit-codeinformationalwarningerrornone

List all rules

boolean

--list-rules-l

SourcesEvery flag above is checked against these

readme

- `cfn-lint -t template.yaml` - `cfn-lint -t template1.yaml template2.yaml` - `cfn-lint -r us-east-1 ap-south-1 -- template.yaml` | -t, --template | | filename | Alternative way to specify Template file path to the file that needs to be tested by cfn-lint | | --parameters |…

manual2026-10-27

github.com

Before it fills your prompt, Otty checks the installed cfn-lint against its version. A form that does not match your version is not offered.