openapi-format
Advanced tools
Format an OpenAPI document by ordering, formatting and filtering fields.
Format an OpenAPI document by ordering, formatting and filtering fields.
The openapi-format CLI can load an OpenAPI file, sorts the OpenAPI fields by ordering them in a hierarchical order, format the casing of the fields and can output the file with clean indenting, to either JSON or YAML.
Next to the ordering & formatting, the CLI provides additional options to filter fields & parts of the OpenAPI document based on flags, tags, methods, operationID's and even unused components.
Public documentation: An OpenAPI document is a specification that evolves and changes. To facilitate working with the specification and publishing the document as public documentation, you want to deliver a clean and structured specification. OpenAPI-format helps you to organize the fields by sorting, formatting and filtering specific elements from the OpenAPI like internal endpoints, beta tags, ... and even unused schemas, examples, responses, ... with a clean and optimized OpenAPI document as a result.
Maintenance: When working on large OpenAPI documents or with multiple team members, the file can be become messy and difficult to compare changes. By sorting & formatting from time to time, the fields are all ordered in a structured manner & properly cased, which will help you to maintain the file with greater ease.
CI/CD pipelines: OpenAPI-format can be useful in CI/CD pipelines, where the OpenAPI is used as the source for other documents like Web documentation, Postman collections, test suites, ...
While possible to install globally, we recommend that you add the openapi-format CLI to the node_modules by using:
$ npm install --save openapi-format
or using yarn...
$ yarn add openapi-format
Note that this will require you to run the openapi-format CLI with npx openapi-format your-openapi-file.yaml or, if
you are using an older versions of npm, ./node_modules/.bin/openapi-format your-openapi-file.yaml.
$ npm install -g openapi-format
To execute the CLI without installing it via npm, use the npx method
$ npx openapi-format your-openapi-file.yaml
openapi-format.js <input-file> -o [ouptut-file] [options]
Arguments:
infile the OpenAPI document, can be either a .json or .yaml file
outfile the output file is optional and be either a .json or .yaml file. Files that end in `.json` will be formatted
as JSON files that end in `.yaml` or `.yml` will be YAML format
Options:
--output, -o Save the formated OpenAPI file as JSON/YAML [path]
--sortFile The file to specify custom OpenAPI fields ordering [path]
--casingFile The file to specify casing rules [path]
--filterFile The file to specify filter rules [path]
--no-sort Don't sort the OpenAPI file [boolean]
--sortComponentsFile The file with components to sort alphabetically [path]
--rename Rename the OpenAPI title [string]
--configFile The file with the OpenAPI-format CLI options [path]
--lineWidth Max line width of YAML output [number]
--json Prints the file to stdout as JSON [boolean]
--yaml Prints the file to stdout as YAML [boolean]
--help Show help [boolean]
--version Output the version number
--verbose Output more details of the filter process [count]
| Parameter | Alias | Description | Input type | Default | Info |
|---|---|---|---|---|---|
| file | the original OpenAPI file | path to file | required | ||
| --output | -o | save the formatted OpenAPI file as JSON/YAML | path to file | optional | |
| --sortFile | -s | the file to specify custom OpenAPI fields ordering | path to file | defaultSort.json | optional |
| --filterFile | -f | the file to specify filter setting | path to file | defaultFilter.json | optional |
| --casingFile | -c | the file to specify casing setting | path to file | optional | |
| --no-sort | don't sort the OpenAPI file | boolean | FALSE | optional | |
| --sortComponentsFile | sort the items of the components (schemas, parameters, ...) by alphabet | path to file | defaultSortComponents.json | optional | |
| --rename | rename the OpenAPI title | string | optional | ||
| --configFile | -c | the file with all the format config options | path to file | optional | |
| --lineWidth | max line width of YAML output | number | -1 (Infinity) | optional | |
| --json | prints the file to stdout as JSON | FALSE | optional | ||
| --yaml | prints the file to stdout as YAML | FALSE | optional | ||
| --version | output the version number | optional | |||
| --verbose | -v, -vv, -vvv | verbosity that can be increased, which will show more output of the process | optional | ||
| --help | h | display help for command | optional |
The CLI will sort the OpenAPI document in the defined order liked defined per OpenAPI key/element. The fields that are not specified will keep their order like it is in the original OpenAPI document, so only defined fields will be re-ordered.
The default sorting based on the defined order (listed in the table below), which is stored in the defaultSort.json file.
You can easily modify this by specifying your own ordering per key, which can be passed on to the CLI (see below for an example on how to do this).
| Key | Ordered by | OpenAPI reference |
|---|---|---|
| root | - openapi - info - servers - paths - components - tags - x-tagGroups - externalDocs | openapi-object |
| get | - operationId - summary - description - parameters - requestBody - responses | operationObject |
| post | - operationId - summary - description - parameters - requestBody - responses | operationObject |
| put | - operationId - summary - description - parameters - requestBody - responses | operationObject |
| patch | - operationId - summary - description - parameters - requestBody - responses | operationObject |
| delete | - operationId - summary - description - parameters - requestBody - responses | operationObject |
| parameters | - name - in - description - required - schema | parameterObject |
| requestBody | - description - headers - content - links | request-body-object |
| responses | - description - headers - content - links | responses-object |
| content | (By alphabet) | responses-object |
| components | - parameters - schemas | components-object |
| schema | - description - type - items - properties - format - example - default | schemaObject |
| schemas | - description - type - items - properties - format - example - default | |
| properties | - description - type - items - format - example - default - enum |
Have a look at the folder yaml-default and compare the "output.yaml" (sorted document) with the "input.yaml" (original document), to see how openapi-format have sorted the OpenAPI document.
By specifying the desired filter values for the available filter types, the openapi-format CLI will strip out any matching item from the OpenAPI document. You can combine multiple types to filter out a range of OpenAPI items.
For more complex use-cases, we can advise the excellent https://github.com/Mermade/openapi-filter package, which has extended options for filtering OpenAPI documents.
| Type | Description | Type | Examples |
|---|---|---|---|
| methods | OpenAPI methods. | array | ['get','post','put'] |
| inverseMethods | OpenAPI methods that will be kept | array | ['get','post','put'] |
| tags | OpenAPI tags | array | ['pet','user'] |
| inverseTags | OpenAPI tags that will be kept | array | ['pet','user'] |
| operationIds | OpenAPI operation ID's | array | ['findPetsByStatus','updatePet'] |
| inverseOperationIds | OpenAPI operation ID's that will be kept | array | ['findPetsByStatus','updatePet'] |
| operations | OpenAPI operations | array | ['GET::/pets','PUT::/pets'] |
| flags | Custom flags | array | ['x-exclude','x-internal'] |
| flagValues | Custom flags with a specific value | array | ['x-version: 1.0','x-version: 3.0'] |
| responseContent | Response Content types | array | ['application/json','application/html'] |
| inverseResponseContent | Response Content types that will kept | array | ['application/ld+json'] |
| unusedComponents | Unused components | array | ['examples','schemas'] |
| stripFlags | Custom flags that will be stripped | array | ['x-exclude','x-internal'] |
| textReplace | Search & replace values to replace | array | [{'searchFor':'Pet','replaceWith':'Dog'}] |
Some more details on the available filter types:
=> methods: Refers to the Path Item Object
This will remove all fields and attached fields that match the verbs. In the example below, this would mean that
all get, put, post items would be removed from the OpenAPI document.
openapi: 3.0.0
info:
title: API
version: 1.0.0
paths:
/pets:
get:
summary: Finds Pets by status
put:
summary: Update an existing pet
=> inverseMethods: This option does the inverse filtering, by keeping only the verbs defined and remove all other verbs.
=> tags: Refers to the "tags" field from the "Operation Object" https://spec.openapis.org/oas/v3.0.3.html#operationObject
This will remove all fields and attached fields that match the tags. In the example below, this would mean that all
items with the tags pet or user would be removed from the OpenAPI document.
For example:
openapi: 3.0.0
info:
title: API
version: 1.0.0
paths:
/pets:
put:
tags:
- pet
summary: Update an existing pet
=> inverseTags: This option does the inverse filtering, by keeping only the tags defined and remove all other tags, including the operations without a tags.
=> operationIds: Refers to the "operationId" field from the Operation Object
This will remove specific fields and attached fields that match the operation ID's. In the example below, this would
mean that the item with operationID findPetsByStatus would be removed from the OpenAPI document.
For example:
openapi: 3.0.0
info:
title: API
version: 1.0.0
paths:
/pets:
get:
operationId: findPetsByStatus
=> inverseTags: This option does the inverse filtering, by keeping only the operationIds defined and remove all other operationIds, including the operations without an operationId.
=> operations: Refers to a combination of a OpenAPI method & path from the Path Object & Path item
This will remove specific path items that match the operation definition PUT::/pets. In the example below, this would
mean that the item with the path '/pets' and method 'PUT' would be removed from the OpenAPI document.
For example:
openapi: 3.0.0
info:
title: API
version: 1.0.0
paths:
/pets:
get:
summary: Finds Pets by status
put:
summary: Update an existing pet
An operationId is an optional property. To offer support for OpenAPI documents that don't have operationIds, we have
added the operation definition which is the unique combination of the OpenAPI method & path, with a :: separator
symbol.
This will allow filtering for very specific OpenAPI items, without the need of adding operationIds to the OpenAPI document.
To facilitate managing the filtering, we have included wildcard options for the operations option, supporting the
methods & path definitions.
REMARK: Be sure to put quotes around the target definition.
Strict matching example: "GET::/pets"
This will target only the "GET" method and the specific path "/pets"
Method wildcard matching example: "*::/pets"
This will target all methods ('get', 'put', 'post', 'delete', 'options', 'head', 'patch', 'trace') and the specific
path "/pets"
Path wildcard matching example: "GET::/pets/*"
This will target only the "GET" method and any path matching any folder behind the "/pets", like "/pets/123" and
"/pets/123/buy".
Method & Path wildcard matching example: "*::/pets/*"
A combination of wildcards for the method and path parts is even possible.
=> flags: Refers to a custom property that can be set on any field in the OpenAPI document.
This will remove all fields and attached fields that match the flags. In the example below, this would mean that all
items with the flag x-exclude would be removed from the OpenAPI document.
For example:
openapi: 3.0.0
info:
title: API
version: 1.0.0
paths:
/pets:
get:
x-exclude: true
=> flagValues: Refers to a flag, custom property which can be set on any field in the OpenAPI document, and the combination with the value for that flag.
This will remove all fields and attached fields that match the flag with the specific value.
A flagValues example:
flagValues:
- x-version: 1.0
- x-version: 3.0
In the example below, this would mean that all items with the flag x-version that matches x-version: 1.0 OR x-version: 3.0 would be removed from the OpenAPI document.
openapi: 3.0.0
info:
title: API
version: 1.0.0
paths:
/pets:
get:
x-version: 1.0
The filter option flagValues also will remove flags that contain an array of values in the OpenAPI document.
A flagValues example:
flagValues:
- x-versions: 1.0
- x-versions: 2.0
In the example below, this would mean that all items with the flag x-versions, which is an array, that match x-version: 1.0 OR x-version: 3.0 would be removed from the OpenAPI document.
openapi: 3.0.0
info:
title: API
version: 1.0.0
paths:
/pets:
get:
x-versions:
- 1.0
- 3.0
- 5.0
Have a look at flagValues and flagValues for array values for a practical example.
=> ResponseContent: Refers to the Response Object's content
A content example:
content:
- application/json
This will remove all the content that match the media types. In the example below, this would mean that all application/json
content items would be removed from the OpenAPI document
Example before:
openapi: 3.0.0
info:
title: API
version: 1.0.0
paths:
/pet:
post:
tags:
- pet
summary: Add a new pet to the store
description: Add a new pet to the store
operationId: addPet
x-visibility: true
responses:
'200':
description: Successful operation
content:
application/xml:
schema:
$ref: '#/components/schemas/Pet'
application/json:
schema:
$ref: '#/components/schemas/Pet'
'405':
description: Invalid input
Example after:
openapi: 3.0.0
info:
title: API
version: 1.0.0
paths:
/pet:
post:
tags:
- pet
summary: Add a new pet to the store
description: Add a new pet to the store
operationId: addPet
x-visibility: true
responses:
'200':
description: Successful operation
content:
application/xml:
schema:
$ref: '#/components/schemas/Pet'
'405':
description: Invalid input
=> inverseResponseContent: This option does the inverse filtering, by keeping only the content with media types defined and remove all other content.
=> unusedComponents: Refers to a list of reusable component types, from which unused items will be removed.
This option allows you to strip the OpenAPI document from any unused items of the targeted components types.
Any item in the list of OpenAPI components that is not referenced as $ref, will get marked and removed from the OpenAPI document.
REMARK: We will recursively strip all unused components, with a maximum depth of 10 times. This means that "nested" components, that become unused, will also get removed
Supported component types that can be marked as "unused":
=> textReplace: "search & replace" option to replace text in the OpenAPI specification
The textReplace provides a "search & replace" method, that will search for a text/word/characters in the OpenAPI description, summary, URL fields and replace it with another text/word/characters.
This is very useful to replace data in the OpenAPI specification.
A textReplace example:
textReplace:
- searchFor: 'Pets'
replaceWith: 'Dogs'
- searchFor: 'swagger.io'
replaceWith: 'openapis.org'
This will replace all "Pets" with "Dogs" & "swagger.io" with "openapi.org" in the OpenAPI document.
=> stripFlags: Refers to a list of custom properties that can be set on any field in the OpenAPI document.
The stripFlags will remove only the flags, the linked parent and properties will remain. In the example below, this would mean that all
flags x-exclude itself would be stripped from the OpenAPI document.
Example before:
openapi: 3.0.0
info:
title: API
version: 1.0.0
paths:
/pets:
get:
x-exclude: true
summary: Finds Pets by status
Example after:
openapi: 3.0.0
info:
title: API
version: 1.0.0
paths:
/pets:
get:
summary: Finds Pets by status
š BETA NOTICE: This feature is considered BETA since we are investigating the configuration syntax and extra formatting/casing capabilities.
Tools like spectral or speccy, or any of the linting tools, provide a manner to validate & lint OpenAPI specifications to be uniform. The linting tool informs about the incorrect usage of OpenAPI properties & inconsistent field names. This is very useful and helps to guard the quality of the OpenAPI specification. They inform which fields to correct so that the specification will comply with all the defined linting rules.
The openapi-format CLI formatting option can assist with keeping the field names consistent by automatically changing the casing of the properties/keys/names for the different elements in the OpenAPI document. The desired casing can be defined per OpenAPI key/element (see list below). The keys that are not specified will keep their casing like it is in the original OpenAPI document, so only for defined fields, the casing will be changed.
| Key | Description | OpenAPI reference |
|---|---|---|
| operationId | Changes operation ID's that are part of the Operations Object | operation-object |
| properties | Changes property keys of the schemas of the inline response/requestBody & components | schemaObject |
| parametersPath | Changes the path name of the parameters inline & models in the components | parameter-object |
| parametersHeader | Changes the header name of the parameters inline & models in the components | parameter-object |
| parametersQuery | Changes the query name of the parameters inline & models in the components | parameter-object |
| componentsParametersPath | Changes the key of the path models in the components parameters sections & "$ref" links | components-object |
| componentsParametersQuery | Changes the key of the query models in the components parameters sections & "$ref" links | components-object |
| componentsParametersHeader | Changes the key of the header models in the components parameters sections & "$ref" links | components-object |
| componentsSchemas | Changes the key of the schema models in the components sections & "$ref" links | components-object |
| componentsExamples | Changes the key of the example models in the components sections & "$ref" links | components-object |
| componentsHeaders | Changes the key of the header models in the components sections & "$ref" links | components-object |
| componentsResponses | Changes the key of the response models in the components sections & "$ref" links | components-object |
| componentsRequestBodies | Changes the key of the request body models in the components sections & "$ref" links | components-object |
| componentsSecuritySchemes | Changes the key of the security schemes in the components sections & "$ref" links | components-object |
| Casing type | Casing alias | Description | Example |
|---|---|---|---|
| šŖ camelCase | camelCase | converts a strings to camelCase | openapiFormat |
| šØāš« PascalCase | PascalCase | converts a strings to PascalCase | OpenapiFormat |
| š„ kebab-case | kebabCase | converts a strings to kebab-case | openapi-format |
| š Train-Case | TrainCase | converts a strings to Train-Case | Openapi-Format |
| š snake_case | snakeCase | converts a strings to snake_case | openapi_format |
| š Ada_Case | AdaCase | converts a strings to Ada_Case | Openapi_Format |
| š£ CONSTANT_CASE | constantCase | converts a strings to CONSTANT_CASE | OPENAPI_FORMAT |
| š COBOL-CASE | cobolCase | converts a strings to COBOL-CASE | OPENAPI-FORMAT |
| š Dot.notation | dotNotation | converts a strings to Dot.notation | openapi.format |
| š° Space case | spaceCase | converts a strings to Space case (with spaces) | openapi format |
| š Capital Case | capitalCase | converts a strings to Capital Case (with spaces) | Openapi Format |
| š” lower case | lowerCase | converts a strings to lower case (with spaces) | openapi format |
| š UPPER CASE | upperCase | converts a strings to UPPER CASE (with spaces) | OPENAPI FORMAT |
REMARK: All special characters are stripped during conversion, except for the
@and$, since they can be part of the query strings.
The casing options are provided by the nano NPM case-anything package.
=> operationId: Refers to the operationId properties in the OpenAPI document.
Formatting casing example:
operationId: kebab-case
Example before:
openapi: 3.0.3
paths:
/pets:
get:
operationId: getPets
openapi-format will format the "getPets" from the original camelcase to kebab-case.
Example after:
openapi: 3.0.3
paths:
/pets:
get:
operationId: get-pets
=> properties: Refers to all the schema properties, that are defined inline in the paths request bodies & responses and the models in the components section of the OpenAPI document.
Formatting casing example:
properties: snake_case
Example before:
openapi: 3.0.3
components:
schemas:
UserModel:
type: object
properties:
id:
type: integer
example: 10
emailAddress:
type: string
example: john@doe.com
firstName:
type: string
example: John
The CLI will format all the properties like: "id", "username", "firstName" from the original camelcase to snake_case.
Example after:
openapi: 3.0.3
components:
schemas:
UserModel:
type: object
properties:
id:
type: integer
example: 10
email_address:
type: string
example: john@doe.com
first_name:
type: string
example: John
=> componentsSchemas / componentsExamples / componentsParametersHeader / componentsParametersQuery / componentsParametersQuery / componentsParametersPath / componentsHeaders / componentsResponses / componentsRequestBodies / componentsSecuritySchemes: Refers to all the model objects that are defined in the components section of the OpenAPI document.
Formatting casing example:
componentsSchemas: PascalCase
Example before:
openapi: 3.0.3
paths:
/orders:
get:
responses:
content:
application/json:
schema:
$ref: '#/components/schemas/order-model'
components:
schemas:
userModel:
type: object
order-model:
type: object
pet_model:
type: object
openapi-format will format all the component keys like: "userModel", "order-model", "pet_model" to PascalCase, including formatting all the "$ref" used in the OpenAPI document.
Example after:
openapi: 3.0.3
paths:
/orders:
get:
responses:
content:
application/json:
schema:
$ref: '#/components/schemas/OrderModel'
components:
schemas:
UserModel:
type: object
OrderModel:
type: object
PetModel:
type: object
=> componentsParametersPath / componentsParametersQuery / componentsParametersHeader: Refers to "name" in the Parameters types: Path, Query or Header, which can be defined inline in the Path or as a reference in the components of the OpenAPI document.
Formatting casing example:
componentsSchemas: kebab-case
Example before:
openapi: 3.0.3
paths:
'/pet/{petId}':
get:
parameters:
- name: petId
in: path
description: ID of pet to return
- $ref: '#/components/parameters/LimitParam'
components:
parameters:
LimitParam:
name: limitParam
in: query
description: max records to return
The CLI will format the "name" of the parameters: Path, Query or Header like: "petId", "limitParam" to kebab-case in the OpenAPI document.
Example after:
openapi: 3.0.3
paths:
'/pet/{petId}':
get:
parameters:
- name: pet-id
in: path
description: ID of pet to return
- $ref: '#/components/parameters/LimitParam'
components:
parameters:
LimitParam:
name: limit-param
in: query
description: max records to return
$ openapi-format openapi.json -o openapi-formatted.json
$ openapi-format openapi.json -o openapi.yaml
$ openapi-format openapi.json --json
$ openapi-format openapi.json --yaml
$ openapi-format openapi.json -o openapi.yaml
$ openapi-format openapi.json -o openapi-formatted.json --no-sort
This should keep the OpenAPI fields in the same order. This can be needed, when you only want to do a filtering or rename action.
$ openapi-format openapi.json -o openapi-formatted.json --sortComponentsFile ./test/json-sort-components/customSortComponents.json
This will sort all elements in the components ( components/schemas, components/parameters, components/headers, components/requestBodies, components/responses, ...) section by alphabet.
When you want to strip certain methods ,tags, operationIds, operations, flags you can pass a filterFile which contains the
specific values for the methods ,tags, operationIds, operations, flags.
This can be useful to combine with the sorting, to end up with an order and filtered OpenAPI document.
example:
$ openapi-format openapi.json -o openapi-formatted.json --filterFile customFilter.yaml
where the customFilter.yaml would contain a combination of all the elements you want to filter out.
flags:
- x-visibility
flagValues: [ ]
tags: [ ]
operationIds:
- addPet
- findPetsByStatus
During CI/CD pipelines, you might want to create different results of the OpenAPI document. Having the option to rename them might make it easier to work with the results, so that is why we provide this command option.
$ openapi-format openapi.json -o openapi.json --rename "OpenAPI Petstore - OpenAPI 3.0"
which results in
{
"openapi": "3.0.2",
"info": {
"title": "Petstore - OpenAPI 3.0",
{
"openapi": "3.0.2",
"info": {
"title": "OpenAPI Petstore - OpenAPI 3.0",
All the CLI options can be managed in a separate configuration file and passed along the openapi-format command. This will make configuration easier, especially in CI/CD implementations where the configuration can be stored in version control systems.
example:
$ openapi-format openapi.json --configFile openapi-format-options.json
The formatting will happen based on all the options set in the openapi-format-options.json file. All the
available OpenAPI format options can be used in the
config file.
For handling AsyncAPI documents, we have created a separate package asyncapi-format to allow customisation specific for AsyncAPI use-cases.
We have adopted the YAML parsing style from Stoplight Studio, by leveraging the @stoplight/yaml package for handling the parsing of OpenAPI YAML files.
By using the Stoplight YAML parsing, the results will be slightly different from when using a normal YAML parsing library, like js-to-yaml. We appreciate the Stoplight Studio tool, since it is an excellent GUI for working with OpenAPI documents for non-OpenAPI experts who will be contributing changes. By adopting the Stoplight Studio YAML parsing, the potential risk of merge conflicts will be lowered, which is the main reason why we opted for using the @stoplight/yaml package.
This package is inspired by the @microsoft.azure/format-spec from @fearthecowboy. The original code was not available on GitHub, with the last update being 3 years ago, so to improve support and extend it we tried to reproduce the original functionality.
The filter capabilities from openapi-format are a light version grounded by the work from @MikeRalphson on
the openapi-filter package.
The casing options available in openapi-format are powered by the excellent case-anything nano package from Luca Ban (@mesqueeb).
[1.10.1] - 2022-05-03
FAQs
Format an OpenAPI document by ordering, formatting and filtering fields.
The npm package openapi-format receives a total of 21,416 weekly downloads. As such, openapi-format popularity was classified as popular.
We found that openapi-format demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago.Ā It has 0 open source maintainers collaborating on the project.
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