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    4.3.0 • Public • Published

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    OpenAPI 3.0 to Postman Collection v2.1.0 Converter

    Build Status npm npm


    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:


    The convert function takes in your OpenAPI 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.


    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: 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]


    • -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


    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 + -
    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":, "value": link}
    api_key in (query or header) components.securitySchemes.api_key -


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