diff --git a/src/models/MultiLangString.js b/src/models/MultiLangString.js
index 437fa8f..3a06f92 100644
--- a/src/models/MultiLangString.js
+++ b/src/models/MultiLangString.js
@@ -103,6 +103,11 @@ class MultiLangString extends Map {
     super(Object.entries(data));
 
   }
+
+  toJSON() {
+    return Object.fromEntries(this);
+  }
+
 }
 
 export default new Proxy(MultiLangString, classTraps);
diff --git a/src/models/MultiLangString.test.js b/src/models/MultiLangString.test.js
index 30b147a..c55683c 100644
--- a/src/models/MultiLangString.test.js
+++ b/src/models/MultiLangString.test.js
@@ -9,6 +9,8 @@ const {
 
 const modelName = `MultiLangString`;
 
+const sampleData = { eng: 'Hello world!', spa: 'Hola mundo!' };
+
 describe(modelName, () => {
 
   it(`class: MultiLangString`, () => {
@@ -70,28 +72,36 @@ describe(modelName, () => {
 
   describe(`MultiLangString.prototype.{language}`, () => {
 
-    const data = { eng: 'Hello world!', spa: 'Hola mundo!' };
-
     it(`Instantiation`, () => {
-      const mls = new MultiLangString(data);
-      expect(mls.get(`eng`)).toBe(data.eng);
-      expect(mls.get(`spa`)).toBe(data.spa);
+      const mls = new MultiLangString(sampleData);
+      expect(mls.get(`eng`)).toBe(sampleData.eng);
+      expect(mls.get(`spa`)).toBe(sampleData.spa);
     });
 
     it(`Error: set bad language tag`, () => {
-      const mls = new MultiLangString(data);
+      const mls = new MultiLangString(sampleData);
       const setBadLanguageTag = () => mls.set(`Tlahuapa Mixtec`, `ayoo`);
       expect(setBadLanguageTag).toThrowMatching(e => e.name === `LanguageTagError`);
     });
 
     it(`Error: set bad string`, () => {
-      const mls = new MultiLangString(data);
+      const mls = new MultiLangString(sampleData);
       const setBadString = () => mls.set(`mix`, true);
       expect(setBadString).toThrowMatching(e => e.name === `MultiLangStringError`);
     });
 
   });
 
+  it(`MultiLangString.prototype.toJSON()`, () => {
+
+    const mls  = new MultiLangString(sampleData);
+    const pojo = JSON.parse(JSON.stringify(mls));
+
+    Object.keys(sampleData)
+    .forEach(key => expect(pojo[key]).toBe(sampleData[key]));
+
+  });
+
   it(`~~MultiLangString.prototype.type~~`, () => {
     expect(new MultiLangString().type).toBeUndefined();
   });
diff --git a/src/models/index.test.js b/src/models/index.test.js
index b1493eb..2bfe14e 100644
--- a/src/models/index.test.js
+++ b/src/models/index.test.js
@@ -1,3 +1,7 @@
+/* eslint-disable
+  max-nested-callbacks,
+*/
+
 const { models } = require(`../../test`);
 
 const {
@@ -5,10 +9,6 @@ const {
   Language,
 } = models;
 
-/**
- * Check that the models module has the expected exports
- */
-
 describe(`models`, () => {
 
   it(`has the expected exports`, () => {