postmanlabs/openapi-to-postman

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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. Syncing Collections
3. Using the converter as a NodeJS module
   1. Convert Function
   2. Sync Collection Function
   3. Options
   4. ConversionResult
   5. Sample usage
   6. 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.

$ 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]

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

• --sync <collectionFile> Sync spec changes with an existing Postman Collection file

• --sync-options <syncOptions> Comma-separated list of sync options (e.g., syncExamples=true)

• --sync-options-config <syncOptionsConfig> JSON file containing sync options

Usage

• 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

Syncing Collections

The sync functionality allows you to update an existing Postman collection with changes from your OpenAPI specification.

Basic Sync

$ openapi2postmanv2 -s spec.yaml --sync collection.json -o synced-collection.json

Sync with Options

$ openapi2postmanv2 -s spec.yaml --sync collection.json --sync-options syncExamples=true -o synced-collection.json

Sync with Config File

$ openapi2postmanv2 -s spec.yaml --sync collection.json --sync-options-config sync-options.json -o synced-collection.json

sync-options.json:

{
  "syncExamples": true,
  "deleteOrphanedRequests": false
}

Available Sync Options

For a complete list of sync options and their usage, see SYNC_OPTIONS.md

🛠 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 3.0, 3.1 and Swagger 2.0 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.
*/

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

callback:

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

Sync Collection

The syncCollection function syncs changes from an OpenAPI specification with an existing Postman collection.

Signature: syncCollection (data, options, collection, syncOptions, callback);

data:

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

options:

{
  parametersResolution: 'Example',
  folderStrategy: 'Tags'
}
/*
Regular conversion options. Check the options section below for possible values.
*/

collection:

// Existing Postman collection object (JSON)
const collection = {
  info: { name: 'My API', schema: '...' },
  item: [...]
}

syncOptions:

{
  syncExamples: true
}
/*
Sync-specific options that control the merge behavior.
All sync options are optional. Check SYNC_OPTIONS.md for details.
*/

Note: All possible values of sync options can be found here: SYNC_OPTIONS.md

callback:

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

Converting a specification

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);
    }
  }
);

Syncing a specification with an existing collection

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

const syncOptions = {
  syncExamples: true,
  deleteOrphanedRequests: false
};

Converter.syncCollection(
  { type: 'string', data: openapiData },
  {}, // conversion options
  existingCollection,
  syncOptions,
  (err, syncResult) => {
    if (!syncResult.result) {
      console.log('Could not sync', syncResult.reason);
    }
    else {
      console.log('The collection object is: ', syncResult.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