openapi-to-postmanv2

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OpenAPI 3.0 to Postman Collection v2.1.0 Converter

Contents

1. Getting Started
2. Using the converter as a NodeJS module
   1. Convert Function
   2. Options
   3. ConversionResult
   4. Sample usage
   5. Validate function
3. Command Line Interface
   1. Options
   2. Usage
4. Conversion Schema

---

Getting Started

To use the converter as a Node module, you need to have a copy of the NodeJS runtime. The easiest way to do this is through npm. If you have NodeJS installed you have npm installed as well.

$ npm install openapi-to-postmanv2

If you want to use the converter in the CLI, install it globally with NPM:

$ npm i -g openapi-to-postmanv2

Using the converter as a NodeJS module

In order to use the convert in your node application, you need to import the package using require.

var Converter = require('openapi-to-postmanv2')

The converter provides the following functions:

Convert

The convert function takes in your OpenAPI specification ( YAML / JSON ) and converts it to a Postman collection.

Signature: convert (data, options, callback);

data:

{ type: 'file', data: 'filepath' }
OR
{ type: 'string', data: '<entire OpenAPI string - JSON or YAML>' }
OR
{ type: 'json', data: OpenAPI-JS-object }

options:

{
  schemaFaker: true,
  requestNameSource: 'fallback',
  indentCharacter: ' '
}
/*
All three properties are optional. Check the options section below for possible values for each option.
*/

callback:

function (err, result) {
  /*
  result = {
    result: true,
    output: [
      {
        type: 'collection',
        data: {..collection object..}
      }
    ]
  }
  */
}

Options:

Check out complete list of options and their usage at OPTIONS.md

ConversionResult

• result - Flag responsible for providing a status whether the conversion was successful or not

• reason - Provides the reason for an unsuccessful conversion, defined only if result: false

• output - Contains an array of Postman objects, each one with a type and data. The only type currently supported is collection.

Sample Usage:

var fs = require('fs'),

Converter = require('openapi-to-postmanv2'),
openapiData = fs.readFileSync('sample-spec.yaml', {encoding: 'UTF8'});

Converter.convert({ type: 'string', data: openapiData },
  {}, (err, conversionResult) => {
    if (!conversionResult.result) {
      console.log('Could not convert', conversionResult.reason);
    }
    else {
      console.log('The collection object is: ', conversionResult.output[0].data);
    }
  }
);

Validate Function

The validate function is meant to ensure that the data that is being passed to the convert function is a valid JSON object or a valid (YAML/JSON) string.

The validate function is synchronous and returns a status object which conforms to the following schema

Validation object schema

{
  type: 'object',
  properties: {
    result: { type: 'boolean'},
    reason: { type: 'string' }
  },
  required: ['result']
}

Validation object explanation

• result - true if the data looks like OpenAPI and can be passed to the convert function

• reason - Provides a reason for an unsuccessful validation of the specification

Command Line Interface

The converter can be used as a CLI tool as well. The following command line options are available.

openapi2postmanv2 [options]

Options

• -v, --version
  Specifies the version of the converter

• -s <source>, --spec <source>
  Used to specify the OpenAPI specification (file path) which is to be converted

• -o <destination>, --output <destination>
  Used to specify the destination file in which the collection is to be written

• -t, --test
  Used to test the collection with an in-built sample specification

• -p, --pretty
  Used to pretty print the collection object while writing to a file

• -O, --options Used to supply options to the converter, for complete options details see here

• -c, --options-config
  Used to supply options to the converter through config file, for complete options details see here

• -h, --help
  Specifies all the options along with a few usage examples on the terminal

Usage

Sample usage examples of the converter CLI

• Takes a specification (spec.yaml) as an input and writes to a file (collection.json) with pretty printing and using provided options

$ openapi2postmanv2 -s spec.yaml -o collection.json -p -O folderStrategy=Tags,includeAuthInfoInExample=false

• Takes a specification (spec.yaml) as an input and writes to a file (collection.json) with pretty printing and using provided options via config file

$ openapi2postmanv2 -s spec.yaml -o collection.json -p  -c ./examples/cli-options-config.json

• Takes a specification (spec.yaml) as an input and writes to a file (collection.json) with pretty printing and using provided options (Also avoids any "<Error: Too many levels of nesting to fake this schema>" kind of errors present in converted collection)

$ openapi2postmanv2 -s spec.yaml -o collection.json -p -O folderStrategy=Tags,requestParametersResolution=Example,optimizeConversion=false,stackLimit=50

• Testing the converter

$ openapi2postmanv2 --test

Conversion Schema

postman	openapi	options	examples
collectionName	info.title	-
description	info.description + info.contact	-
collectionVariables	server.variables + pathVariables	-
folderName	paths.path	-
requestName	operationItem(method).operationId	default(operationId)-(requestName)enum['operationId','summary','url']
request.method	path.method	-
request.headers	parameter (in = header)	-	link
request.body	operationItem(method).requestBody	-
request.url.raw	server.url (path level server >> openapi server) + path	-
request.url.variables	parameter (in = path)	-	link
request.url.params	parameter (in = query)	-	{"key": param.name, "value": link}
api_key in (query or header)	components.securitySchemes.api_key	-

Changelog

v4.1.1 (July 29, 2022)

• Replaced Object.hasOwnProperty usages with loadsh _.has for safe access.