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4.22.0 • Public • Published

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OpenAPI 3.0, 3.1 and Swagger 2.0 to Postman Collection

Build Status

npm npm


  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

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

💭 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

📖 Command Line Interface

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

openapi2postmanv2 [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


  • 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

🛠 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:


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);


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


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

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


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


Check out complete list of options and their usage at


  • 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

const 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

🧭 Conversion Schema

postman openapi related options
collectionName info.title -
description info.description + -
collectionVariables server.variables + pathVariables -
folderName paths.path / 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

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