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OpenAPI 3.0, 3.1 and Swagger 2.0 to Postman Collection

Contents

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

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🚀 We now also support OpenAPI 3.1 and Swagger 2.0 along with OpenAPI 3.0.

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💭 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.

1$ npm install openapi-to-postmanv2

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

1$ npm i -g openapi-to-postmanv2

📖 Command Line Interface

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

openapi2postmanv2 [options]

Options

• -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

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

• -i, --interface-version Specifies the interface version of the converter to be used. Value can be 'v2' or 'v1'. Default is 'v2'.

• -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

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

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

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

Usage

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

1$ 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

1$ 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)

1$ openapi2postmanv2 -s spec.yaml -o collection.json -p -O folderStrategy=Tags,requestParametersResolution=Example,optimizeConversion=false,stackLimit=50

• Testing the converter

1$ openapi2postmanv2 --test

🛠 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.

1var Converter = require('openapi-to-postmanv2')

The converter provides the following functions:

Convert

The convert function takes in your OpenAPI 3.0, 3.1 and Swagger 2.0 specification ( YAML / JSON ) and converts it to a Postman collection.

Signature: convert (data, options, callback);

data:

1{ type: 'file', data: 'filepath' }
2OR
3{ type: 'string', data: '<entire OpenAPI string - JSON or YAML>' }
4OR
5{ type: 'json', data: OpenAPI-JS-object }

options:

1{
2  schemaFaker: true,
3  requestNameSource: 'fallback',
4  indentCharacter: ' '
5}
6/*
7All three properties are optional. Check the options section below for possible values for each option.
8*/

Note: All possible values of options and their usage can be found over here: OPTIONS.md

callback:

1function (err, result) {
2  /*
3  result = {
4    result: true,
5    output: [
6      {
7        type: 'collection',
8        data: {..collection object..}
9      }
10    ]
11  }
12  */
13}

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 if false.

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

Sample Usage

1const fs = require('fs'),
2  Converter = require('openapi-to-postmanv2'),
3  openapiData = fs.readFileSync('sample-spec.yaml', {encoding: 'UTF8'});
4
5Converter.convert({ type: 'string', data: openapiData },
6  {}, (err, conversionResult) => {
7    if (!conversionResult.result) {
8      console.log('Could not convert', conversionResult.reason);
9    }
10    else {
11      console.log('The collection object is: ', conversionResult.output[0].data);
12    }
13  }
14);

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

1{
2  type: 'object',
3  properties: {
4    result: { type: 'boolean'},
5    reason: { type: 'string' }
6  },
7  required: ['result']
8}

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

🧭 Conversion Schema

postman	openapi	related options
collectionName	info.title	-
description	info.description + info.contact	-
collectionVariables	server.variables + pathVariables	-
folderName	paths.path / tags.name	folderStrategy
requestName	operationItem(method).summary / operationItem(method).operationId / url	requestNameSource
request.method	path.method	-
request.headers	parameter (in = header)	-
request.body	operationItem(method).requestBody	requestParametersResolution, exampleParametersResolution
request.url.raw	server.url (path level server >> openapi server) + path	-
request.url.variables	parameter (in = path)	-
request.url.params	parameter (in = query)	-
api_key in (query or header)	components.securitySchemes.api_key	includeAuthInfoInExample