diff --git a/lib/index.js b/lib/index.js
index 49ede1d..c720562 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -12,7 +12,7 @@ async function postmanToOpenApi (input, output, {
   responseHeaders = true, replaceVars = false, additionalVars = {}
 } = {}) {
   // TODO validate?
-  let collectionFile = await readFile(input, 'utf8')
+  let collectionFile = await resolveInput(input)
   if (replaceVars) {
     collectionFile = replacePostmanVariables(collectionFile, additionalVars)
   }
@@ -554,6 +554,18 @@ function parseResponseHeaders (headerArray, responseHeaders) {
   return (Object.keys(headers).length > 0) ? { headers } : {}
 }
 
+/**
+ * Just check if is a string collection or a path.
+ * moved to method for allow easy changes in the future like check if it is a collection, validations...
+*/
+async function resolveInput (input) {
+  if (input.trim().startsWith('{')) {
+    return input
+  } else {
+    return readFile(input, 'utf8')
+  }
+}
+
 postmanToOpenApi.version = version
 
 module.exports = postmanToOpenApi
diff --git a/test/index.spec.js b/test/index.spec.js
index 80eac4a..d563a6e 100644
--- a/test/index.spec.js
+++ b/test/index.spec.js
@@ -6,6 +6,7 @@ const path = require('path')
 const { equal, ok } = require('assert').strict
 const { readFileSync, existsSync, unlinkSync } = require('fs')
 const { version } = require('../package.json')
+const { promises: { readFile } } = require('fs')
 
 const OUTPUT_PATH = path.join(__dirname, '/openAPIRes.yml')
 
@@ -483,4 +484,10 @@ describe('Library specs', function () {
     const result = await postmanToOpenApi(COLLECTION_NULL_HEADERS, OUTPUT_PATH, {})
     equal(result, EXPECTED_NULL_HEADER)
   })
+
+  it('should work with string as input (instead of a file path)', async function () {
+    const collectionString = await readFile(COLLECTION_NO_OPTIONS, 'utf8')
+    const result = await postmanToOpenApi(collectionString, OUTPUT_PATH, {})
+    equal(result, EXPECTED_BASIC)
+  })
 })