diff --git a/.pnp.js b/.pnp.js
index 2de341c73..6182a193a 100755
--- a/.pnp.js
+++ b/.pnp.js
@@ -46,6 +46,10 @@ function $$SETUP_STATE(hydrateRuntimeState, basePath) {
         "name": "@lowdefy/graphql",
         "reference": "workspace:packages/graphql"
       },
+      {
+        "name": "@lowdefy/serializer",
+        "reference": "workspace:packages/serializer"
+      },
       {
         "name": "@lowdefy/type",
         "reference": "workspace:packages/type"
@@ -60,6 +64,7 @@ function $$SETUP_STATE(hydrateRuntimeState, basePath) {
       ["@lowdefy/graphql", ["workspace:packages/graphql"]],
       ["@lowdefy/poc", ["workspace:."]],
       ["@lowdefy/poc-express", ["workspace:packages/express"]],
+      ["@lowdefy/serializer", ["workspace:packages/serializer"]],
       ["@lowdefy/type", ["workspace:packages/type"]],
       ["izlrmfxlki", ["workspace:packages/button"]]
     ],
@@ -4254,6 +4259,28 @@ function $$SETUP_STATE(hydrateRuntimeState, basePath) {
           "linkType": "SOFT",
         }]
       ]],
+      ["@lowdefy/serializer", [
+        ["workspace:packages/serializer", {
+          "packageLocation": "./packages/serializer/",
+          "packageDependencies": [
+            ["@lowdefy/serializer", "workspace:packages/serializer"],
+            ["@babel/cli", "virtual:10c70c57b8c041994c932fbc6065790a1801b95ea6f8bb47c7334c5a9a57ca5035df7a515298306323a03d95e4c0d72d9488454f45837690b0620ca3a249c7f5#npm:7.8.4"],
+            ["@babel/compat-data", "npm:7.9.6"],
+            ["@babel/core", "npm:7.9.6"],
+            ["@babel/preset-env", "virtual:10c70c57b8c041994c932fbc6065790a1801b95ea6f8bb47c7334c5a9a57ca5035df7a515298306323a03d95e4c0d72d9488454f45837690b0620ca3a249c7f5#npm:7.9.6"],
+            ["@lowdefy/type", "workspace:packages/type"],
+            ["babel-jest", "virtual:10c70c57b8c041994c932fbc6065790a1801b95ea6f8bb47c7334c5a9a57ca5035df7a515298306323a03d95e4c0d72d9488454f45837690b0620ca3a249c7f5#npm:24.9.0"],
+            ["eslint", "npm:6.8.0"],
+            ["eslint-config-airbnb", "virtual:10c70c57b8c041994c932fbc6065790a1801b95ea6f8bb47c7334c5a9a57ca5035df7a515298306323a03d95e4c0d72d9488454f45837690b0620ca3a249c7f5#npm:18.2.0"],
+            ["eslint-config-prettier", "virtual:73f25cc0d3f57943fa9b1d737e4809af7a52a784e0ac5fed74b4e1e083308ab7ae2fd45a5424a8bc7ff7caab067690c9357630d657cbd636d6037acc1557fdc2#npm:6.12.0"],
+            ["eslint-plugin-prettier", "virtual:73f25cc0d3f57943fa9b1d737e4809af7a52a784e0ac5fed74b4e1e083308ab7ae2fd45a5424a8bc7ff7caab067690c9357630d657cbd636d6037acc1557fdc2#npm:3.1.4"],
+            ["jest", "npm:24.9.0"],
+            ["jest-diff", "npm:24.9.0"],
+            ["prettier", "npm:2.1.2"]
+          ],
+          "linkType": "SOFT",
+        }]
+      ]],
       ["@lowdefy/type", [
         ["npm:1.0.0", {
           "packageLocation": "./.yarn/cache/@lowdefy-type-npm-1.0.0-5c152b70b4-06668d6f58.zip/node_modules/@lowdefy/type/",
diff --git a/packages/serializer/.babelrc b/packages/serializer/.babelrc
new file mode 100644
index 000000000..1650aad60
--- /dev/null
+++ b/packages/serializer/.babelrc
@@ -0,0 +1,13 @@
+{
+  "presets": [
+    [
+      "@babel/preset-env",
+      {
+        "targets": {
+          "node": "10",
+          "esmodules": true
+        }
+      }
+    ]
+  ]
+}
diff --git a/packages/serializer/jest.config.js b/packages/serializer/jest.config.js
new file mode 100644
index 000000000..b3db30fb9
--- /dev/null
+++ b/packages/serializer/jest.config.js
@@ -0,0 +1,19 @@
+module.exports = {
+  // Automatically clear mock calls and instances between every test
+  clearMocks: true,
+
+  // The directory where Jest should output its coverage files
+  coverageDirectory: 'coverage',
+
+  // An array of regexp pattern strings used to skip coverage collection
+  coveragePathIgnorePatterns: ['/node_modules/', '/dist/'],
+
+  // A list of reporter names that Jest uses when writing coverage reports
+  coverageReporters: ['text'],
+
+  // The test environment that will be used for testing
+  testEnvironment: 'node',
+
+  // An array of regexp pattern strings that are matched against all test paths, matched tests are skipped
+  testPathIgnorePatterns: ['/node_modules/', '/dist/'],
+};
diff --git a/packages/serializer/package.json b/packages/serializer/package.json
new file mode 100644
index 000000000..cf4b5e172
--- /dev/null
+++ b/packages/serializer/package.json
@@ -0,0 +1,29 @@
+{
+  "name": "@lowdefy/serializer",
+  "version": "1.0.0",
+  "license": "MIT",
+  "main": "dist/index.js",
+  "scripts": {
+    "build": "babel src --out-dir dist",
+    "test": "jest --coverage",
+    "prepare": "yarn build",
+    "prepublishOnly": "yarn build"
+  },
+  "dependencies": {
+    "@lowdefy/type": "1.0.1"
+  },
+  "devDependencies": {
+    "@babel/cli": "7.8.4",
+    "@babel/compat-data": "7.9.6",
+    "@babel/core": "7.9.6",
+    "@babel/preset-env": "7.9.6",
+    "babel-jest": "24.9.0",
+    "eslint": "6.8.0",
+    "eslint-config-airbnb": "18.2.0",
+    "eslint-config-prettier": "6.12.0",
+    "eslint-plugin-prettier": "3.1.4",
+    "jest": "24.9.0",
+    "jest-diff": "24.9.0",
+    "prettier": "2.1.2"
+  }
+}
diff --git a/packages/serializer/src/index.js b/packages/serializer/src/index.js
new file mode 100644
index 000000000..a9b52e77d
--- /dev/null
+++ b/packages/serializer/src/index.js
@@ -0,0 +1,111 @@
+/* eslint-disable no-param-reassign */
+import type from '@lowdefy/type';
+
+import stableStringify from './stableStringify';
+
+const makeReplacer = (customReplacer, isoStringDates) => (key, value) => {
+  let dateReplacer = (date) => ({ _date: date.valueOf() });
+  if (isoStringDates) {
+    dateReplacer = (date) => ({ _date: date.toISOString() });
+  }
+  let newValue = value;
+  if (customReplacer) {
+    newValue = customReplacer(key, value);
+  }
+  if (type.isObject(newValue)) {
+    Object.keys(newValue).forEach((k) => {
+      if (type.isDate(newValue[k])) {
+        // shallow copy original value before reassigning a value in order not to mutate original value
+        newValue = { ...newValue };
+        newValue[k] = dateReplacer(newValue[k]);
+      }
+    });
+    return newValue;
+  }
+  if (type.isArray(newValue)) {
+    return newValue.map((item) => {
+      if (type.isDate(item)) {
+        return dateReplacer(item);
+      }
+      return item;
+    });
+  }
+  return newValue;
+};
+
+const makeReviver = (customReviver) => (key, value) => {
+  let newValue = value;
+  if (customReviver) {
+    newValue = customReviver(key, value);
+  }
+  if (type.isObject(newValue) && !type.isUndefined(newValue._date)) {
+    if (type.isInt(newValue._date)) {
+      return new Date(newValue._date);
+    }
+    if (newValue._date === 'now') {
+      return newValue;
+    }
+    const result = new Date(newValue._date);
+    if (!type.isDate(result)) {
+      return newValue;
+    }
+    return result;
+  }
+  return newValue;
+};
+
+const serialize = (json, options = {}) => {
+  if (type.isUndefined(json)) return json;
+  if (type.isDate(json)) {
+    if (options.isoStringDates) {
+      return { _date: json.toISOString() };
+    }
+    return { _date: json.valueOf() };
+  }
+  return JSON.parse(JSON.stringify(json, makeReplacer(options.replacer, options.isoStringDates)));
+};
+
+const serializeToString = (json, options = {}) => {
+  if (type.isUndefined(json)) return json;
+
+  if (type.isDate(json)) {
+    if (options.isoStringDates) {
+      return `{ "_date": "${json.toISOString()}" }`;
+    }
+    return `{ "_date": ${json.valueOf()} }`;
+  }
+  if (options.stable) {
+    return stableStringify(json, {
+      replacer: makeReplacer(options.replacer),
+      space: options.space,
+    });
+  }
+  return JSON.stringify(
+    json,
+    makeReplacer(options.replacer, options.isoStringDates),
+    options.space
+  );
+};
+
+const deserialize = (json, options = {}) => {
+  if (type.isUndefined(json)) return json;
+  return JSON.parse(JSON.stringify(json), makeReviver(options.reviver));
+};
+
+const deserializeFromString = (str, options = {}) => {
+  if (type.isUndefined(str)) return str;
+  return JSON.parse(str, makeReviver(options.reviver));
+};
+
+const copy = (json, options = {}) => {
+  if (type.isUndefined(json)) return undefined;
+  if (type.isDate(json)) return new Date(json.valueOf());
+
+  return JSON.parse(
+    JSON.stringify(json, makeReplacer(options.replacer)),
+    makeReviver(options.reviver)
+  );
+};
+
+const serializer = { copy, serialize, serializeToString, deserialize, deserializeFromString };
+export default serializer;
diff --git a/packages/serializer/src/stableStringify.js b/packages/serializer/src/stableStringify.js
new file mode 100644
index 000000000..6a4ffc39d
--- /dev/null
+++ b/packages/serializer/src/stableStringify.js
@@ -0,0 +1,95 @@
+/* eslint-disable no-continue */
+/* eslint-disable no-plusplus */
+/* eslint-disable consistent-return */
+/* eslint-disable no-param-reassign */
+
+import type from '@lowdefy/type';
+
+// https://github.com/substack/json-stable-stringify
+// https://github.com/substack/json-stable-stringify/LICENCE
+
+// This software is released under the MIT license:
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy of
+// this software and associated documentation files (the "Software"), to deal in
+// the Software without restriction, including without limitation the rights to
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do so,
+// subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+function stableStringify(obj, opts) {
+  if (!opts) opts = {};
+  if (typeof opts === 'function') opts = { cmp: opts };
+  let space = opts.space || '';
+  if (typeof space === 'number') space = Array(space + 1).join(' ');
+  const cycles = typeof opts.cycles === 'boolean' ? opts.cycles : false;
+  const replacer = opts.replacer || ((key, value) => value);
+  const cmp =
+    opts.cmp &&
+    ((f) => {
+      return (node) => {
+        return (a, b) => {
+          const aobj = { key: a, value: node[a] };
+          const bobj = { key: b, value: node[b] };
+          return f(aobj, bobj);
+        };
+      };
+    })(opts.cmp);
+
+  const seen = [];
+  return (function stringify(parent, key, node, level) {
+    const indent = space ? `\n${new Array(level + 1).join(space)}` : '';
+    const colonSeparator = space ? ': ' : ':';
+
+    if (node && node.toJSON && typeof node.toJSON === 'function') {
+      node = node.toJSON();
+    }
+
+    node = replacer.call(parent, key, node);
+
+    if (node === undefined) {
+      return;
+    }
+    if (typeof node !== 'object' || node === null) {
+      return JSON.stringify(node);
+    }
+    if (type.isArray(node)) {
+      const out = [];
+      for (let i = 0; i < node.length; i++) {
+        const item = stringify(node, i, node[i], level + 1) || JSON.stringify(null);
+        out.push(indent + space + item);
+      }
+      return `[${out.join(',')}${indent}]`;
+    }
+    if (seen.indexOf(node) !== -1) {
+      if (cycles) return JSON.stringify('__cycle__');
+      throw new TypeError('Converting circular structure to JSON');
+    } else seen.push(node);
+
+    const keys = Object.keys(node).sort(cmp && cmp(node));
+    const out = [];
+    for (let i = 0; i < keys.length; i++) {
+      const ky = keys[i];
+      const value = stringify(node, ky, node[ky], level + 1);
+
+      if (!value) continue;
+
+      const keyValue = JSON.stringify(ky) + colonSeparator + value;
+      out.push(indent + space + keyValue);
+    }
+    seen.splice(seen.indexOf(node), 1);
+    return `{${out.join(',')}${indent}}`;
+  })({ '': obj }, '', obj, 0);
+}
+
+export default stableStringify;
diff --git a/packages/serializer/test/serializer.test.js b/packages/serializer/test/serializer.test.js
new file mode 100644
index 000000000..b1b50c28b
--- /dev/null
+++ b/packages/serializer/test/serializer.test.js
@@ -0,0 +1,452 @@
+import type from '@lowdefy/type';
+
+import serializer from '../src/index';
+
+test('serialize convert object js date to _date', () => {
+  let object = {
+    a: new Date(0),
+  };
+  expect(serializer.serialize(object)).toEqual({ a: { _date: 0 } });
+  object = {
+    a: { b: { c: new Date(120) } },
+  };
+  expect(serializer.serialize(object)).toEqual({ a: { b: { c: { _date: 120 } } } });
+});
+
+test('serialize convert array js date to _date', () => {
+  let object = {
+    a: [new Date(0)],
+  };
+  expect(serializer.serialize(object)).toEqual({ a: [{ _date: 0 }] });
+  object = {
+    a: [{ b: new Date(0), c: [null, new Date(10)], d: [{ e: new Date(20) }] }],
+  };
+  expect(serializer.serialize(object)).toEqual({
+    a: [{ b: { _date: 0 }, c: [null, { _date: 10 }], d: [{ e: { _date: 20 } }] }],
+  });
+});
+
+test('serialize should not change a string date', () => {
+  let object = {
+    a: '2019-11-18T09:51:30.152Z',
+  };
+  expect(serializer.serialize(object)).toEqual(object);
+  object = ['2019-11-18T09:51:30.152Z'];
+  expect(serializer.serialize(object)).toEqual(object);
+});
+
+test('serialize a date should return a serialized date', () => {
+  expect(serializer.serialize(new Date(0))).toEqual({ _date: 0 });
+});
+
+test('serialize array of dates should return a serialized array', () => {
+  expect(serializer.serialize([new Date(0), new Date(1), new Date(2)])).toEqual([
+    { _date: 0 },
+    { _date: 1 },
+    { _date: 2 },
+  ]);
+});
+
+test('serialize primitives should pass', () => {
+  expect(serializer.serialize('a')).toEqual('a');
+  expect(serializer.serialize(0)).toEqual(0);
+  expect(serializer.serialize(1)).toEqual(1);
+  expect(serializer.serialize(-0.1)).toEqual(-0.1);
+  expect(serializer.serialize(false)).toEqual(false);
+  expect(serializer.serialize(true)).toEqual(true);
+  expect(serializer.serialize(null)).toEqual(null);
+  expect(serializer.serialize(undefined)).toEqual(undefined);
+});
+
+test('serializeToString convert object js date to _date', () => {
+  let object = {
+    a: new Date(0),
+  };
+  expect(serializer.serializeToString(object)).toMatchInlineSnapshot(`"{\\"a\\":{\\"_date\\":0}}"`);
+  object = {
+    a: { b: { c: new Date(120) } },
+  };
+  expect(serializer.serializeToString(object)).toMatchInlineSnapshot(
+    `"{\\"a\\":{\\"b\\":{\\"c\\":{\\"_date\\":120}}}}"`
+  );
+});
+
+test('serializeToString convert array js date to _date', () => {
+  let object = {
+    a: [new Date(0)],
+  };
+  expect(serializer.serializeToString(object)).toMatchInlineSnapshot(
+    `"{\\"a\\":[{\\"_date\\":0}]}"`
+  );
+  object = {
+    a: [{ b: new Date(0), c: [null, new Date(10)], d: [{ e: new Date(20) }] }],
+  };
+  expect(serializer.serializeToString(object)).toMatchInlineSnapshot(
+    `"{\\"a\\":[{\\"b\\":{\\"_date\\":0},\\"c\\":[null,{\\"_date\\":10}],\\"d\\":[{\\"e\\":{\\"_date\\":20}}]}]}"`
+  );
+});
+
+test('serializeToString should not change a string date', () => {
+  let object = {
+    a: '2019-11-18T09:51:30.152Z',
+  };
+  expect(serializer.serializeToString(object)).toMatchInlineSnapshot(
+    `"{\\"a\\":\\"2019-11-18T09:51:30.152Z\\"}"`
+  );
+  object = ['2019-11-18T09:51:30.152Z'];
+  expect(serializer.serializeToString(object)).toMatchInlineSnapshot(
+    `"[\\"2019-11-18T09:51:30.152Z\\"]"`
+  );
+});
+
+test('serializeToString a date should return a serialized date', () => {
+  expect(serializer.serializeToString(new Date(0))).toMatchInlineSnapshot(`"{ \\"_date\\": 0 }"`);
+});
+
+test('serialize array of dates should return a serialized array', () => {
+  expect(
+    serializer.serializeToString([new Date(0), new Date(1), new Date(2)])
+  ).toMatchInlineSnapshot(`"[{\\"_date\\":0},{\\"_date\\":1},{\\"_date\\":2}]"`);
+});
+
+test('serializeToString primitives should pass', () => {
+  expect(serializer.serializeToString('a')).toMatchInlineSnapshot(`"\\"a\\""`);
+  expect(serializer.serializeToString(0)).toMatchInlineSnapshot(`"0"`);
+  expect(serializer.serializeToString(1)).toMatchInlineSnapshot(`"1"`);
+  expect(serializer.serializeToString(-0.1)).toMatchInlineSnapshot(`"-0.1"`);
+  expect(serializer.serializeToString(false)).toMatchInlineSnapshot(`"false"`);
+  expect(serializer.serializeToString(true)).toMatchInlineSnapshot(`"true"`);
+  expect(serializer.serializeToString(null)).toMatchInlineSnapshot(`"null"`);
+  expect(serializer.serializeToString(undefined)).toEqual(undefined);
+});
+
+test('serializeToString stable option', () => {
+  let object = {
+    a: 'a',
+    b: 'b',
+    c: 'c',
+  };
+  expect(serializer.serializeToString(object, { stable: true })).toEqual(
+    '{"a":"a","b":"b","c":"c"}'
+  );
+  object = {
+    c: 'c',
+    b: 'b',
+    a: 'a',
+  };
+  expect(serializer.serializeToString(object, { stable: true })).toEqual(
+    '{"a":"a","b":"b","c":"c"}'
+  );
+  object = {
+    c: 'c',
+    b: 'b',
+    a: 'a',
+  };
+  expect(serializer.serializeToString(object, { stable: false })).toEqual(
+    '{"c":"c","b":"b","a":"a"}'
+  );
+});
+
+test('serializeToString stable and space option', () => {
+  const object = {
+    c: 'c',
+    b: 'b',
+    a: 'a',
+  };
+  expect(serializer.serializeToString(object, { stable: true, space: 2 })).toEqual(`{
+  "a": "a",
+  "b": "b",
+  "c": "c"
+}`);
+});
+
+test('serializeToString space option', () => {
+  const object = {
+    c: 'c',
+    b: 'b',
+    a: 'a',
+  };
+  expect(serializer.serializeToString(object, { space: 2 })).toEqual(`{
+  "c": "c",
+  "b": "b",
+  "a": "a"
+}`);
+});
+
+test('deserialize convert _date object to js date', () => {
+  let object = {
+    a: { _date: 0 },
+  };
+  expect(serializer.deserialize(object)).toEqual({ a: new Date(0) });
+  object = {
+    a: { b: { c: { _date: 120 } } },
+  };
+  expect(serializer.deserialize(object)).toEqual({ a: { b: { c: new Date(120) } } });
+  object = {
+    a: { _date: '1970-01-01T00:00:00.000Z' },
+  };
+  expect(serializer.deserialize(object)).toEqual({ a: new Date(0) });
+});
+
+test('deserialize convert _date in array to js date', () => {
+  let object = {
+    a: [{ _date: 0 }],
+  };
+  expect(serializer.deserialize(object)).toEqual({ a: [new Date(0)] });
+  object = {
+    a: [{ b: { _date: 0 }, c: [null, { _date: 10 }], d: [{ e: { _date: 20 } }] }],
+  };
+  expect(serializer.deserialize(object)).toEqual({
+    a: [{ b: new Date(0), c: [null, new Date(10)], d: [{ e: new Date(20) }] }],
+  });
+});
+
+test('deserialize should not change a string date', () => {
+  let object = {
+    a: '2019-11-18T09:51:30.152Z',
+  };
+  expect(serializer.deserialize(object)).toEqual(object);
+  object = ['2019-11-18T09:51:30.152Z'];
+  expect(serializer.deserialize(object)).toEqual(object);
+});
+
+test('deserialize a _date date should return a js date', () => {
+  expect(serializer.deserialize({ _date: 0 })).toEqual(new Date(0));
+  expect(serializer.deserialize({ _date: '1970-01-01T00:00:00.000Z' })).toEqual(new Date(0));
+});
+
+test('deserialize array of _date dates should return a js date array', () => {
+  expect(serializer.deserialize([{ _date: 0 }, { _date: 1 }, { _date: 2 }])).toEqual([
+    new Date(0),
+    new Date(1),
+    new Date(2),
+  ]);
+  expect(serializer.deserialize({ a: [{ _date: '1970-01-01T00:00:00.000Z' }] })).toEqual({
+    a: [new Date(0)],
+  });
+});
+
+test('deserialize primitives should pass', () => {
+  expect(serializer.deserialize('a')).toEqual('a');
+  expect(serializer.deserialize(0)).toEqual(0);
+  expect(serializer.deserialize(1)).toEqual(1);
+  expect(serializer.deserialize(-0.1)).toEqual(-0.1);
+  expect(serializer.deserialize(false)).toEqual(false);
+  expect(serializer.deserialize(true)).toEqual(true);
+  expect(serializer.deserialize(null)).toEqual(null);
+  expect(serializer.deserialize(undefined)).toEqual(undefined);
+});
+
+test('deserializeFromString convert object js date to _date', () => {
+  let object = `{ "a":{ "_date":0}}`;
+  expect(serializer.deserializeFromString(object)).toEqual({
+    a: new Date(0),
+  });
+  object = `{"a":{"b":{"c":{"_date":120}}}}`;
+  expect(serializer.deserializeFromString(object)).toEqual({
+    a: { b: { c: new Date(120) } },
+  });
+  object = `{ "a":{ "_date":"1970-01-01T00:00:00.000Z"}}`;
+  expect(serializer.deserializeFromString(object)).toEqual({
+    a: new Date(0),
+  });
+});
+
+test('deserializeFromString convert array js date to _date', () => {
+  let object = `{"a":[{"_date":0}]}`;
+  expect(serializer.deserializeFromString(object)).toEqual({
+    a: [new Date(0)],
+  });
+  object = `{"a":[{"b":{"_date":0},"c":[null,{"_date":10}],"d":[{"e":{"_date":20}}]}]}`;
+  expect(serializer.deserializeFromString(object)).toEqual({
+    a: [{ b: new Date(0), c: [null, new Date(10)], d: [{ e: new Date(20) }] }],
+  });
+});
+
+test('deserializeFromString should not change a string date', () => {
+  let object = `{"a":"2019-11-18T09:51:30.152Z"}`;
+  expect(serializer.deserializeFromString(object)).toEqual({
+    a: '2019-11-18T09:51:30.152Z',
+  });
+  object = `["2019-11-18T09:51:30.152Z"]`;
+  expect(serializer.deserializeFromString(object)).toEqual(['2019-11-18T09:51:30.152Z']);
+});
+
+test('deserializeFromString a date should return a serialized date', () => {
+  expect(serializer.deserializeFromString(`{"_date":0}`)).toEqual(new Date(0));
+});
+
+test('deserializeFromString array of dates should return a serialized array', () => {
+  expect(serializer.deserializeFromString(`[{"_date":0},{"_date":1},{"_date":2}]`)).toEqual([
+    new Date(0),
+    new Date(1),
+    new Date(2),
+  ]);
+  expect(serializer.deserializeFromString(`[{"_date":"1970-01-01T00:00:00.000Z"}]`)).toEqual([
+    new Date(0),
+  ]);
+});
+
+test('deserializeFromString primitives should pass', () => {
+  expect(serializer.deserializeFromString(`"a"`)).toEqual('a');
+  expect(serializer.deserializeFromString(`0`)).toEqual(0);
+  expect(serializer.deserializeFromString(`1`)).toEqual(1);
+  expect(serializer.deserializeFromString(`-0.1`)).toEqual(-0.1);
+  expect(serializer.deserializeFromString(`false`)).toEqual(false);
+  expect(serializer.deserializeFromString(`true`)).toEqual(true);
+  expect(serializer.deserializeFromString(`null`)).toEqual(null);
+  expect(() => {
+    serializer.deserializeFromString(`undefined}`);
+  }).toThrow(); // does not work with undefined
+});
+
+test('Do not modify original object', () => {
+  const a = { a: { b: [{ c: new Date(0) }] } };
+  expect(serializer.deserializeFromString(serializer.serializeToString(a))).toEqual(a);
+});
+
+test('Undefined values in object', () => {
+  const a = { a: undefined };
+  expect(serializer.serialize(a)).toEqual({});
+  expect(serializer.serializeToString(a)).toEqual('{}');
+});
+
+test('deserializeFromString undefined', () => {
+  const a = undefined;
+  expect(serializer.deserializeFromString(a)).toEqual(undefined);
+});
+
+test('copy an object', () => {
+  const object = {
+    date: new Date(0),
+    array: [1, 'a', true, new Date(1)],
+    string: 'hello',
+    number: 42,
+  };
+  expect(serializer.copy(object)).toEqual({
+    date: new Date(0),
+    array: [1, 'a', true, new Date(1)],
+    string: 'hello',
+    number: 42,
+  });
+});
+
+test('copy undefined', () => {
+  expect(serializer.copy(undefined)).toEqual(undefined);
+});
+
+test('copy a date', () => {
+  expect(serializer.copy(new Date(0))).toEqual(new Date(0));
+});
+
+test('copy with custom reviver', () => {
+  const reviver = (key, value) => (key === 'a' ? 'x' : value);
+  expect(serializer.copy({ a: 1, b: 2, c: new Date(120) }, { reviver })).toEqual({
+    a: 'x',
+    b: 2,
+    c: new Date(120),
+  });
+});
+
+test('deserializeFromString with custom reviver', () => {
+  const reviver = (key, value) => (key === 'a' ? 'x' : value);
+  expect(
+    serializer.deserializeFromString('{ "a": 1, "b": 2, "c": {"_date": 120 } }', { reviver })
+  ).toEqual({
+    a: 'x',
+    b: 2,
+    c: new Date(120),
+  });
+});
+
+test('deserialize with custom reviver', () => {
+  const reviver = (key, value) => (key === 'a' ? 'x' : value);
+  expect(serializer.deserialize({ a: 1, b: 2, c: { _date: 120 } }, { reviver })).toEqual({
+    a: 'x',
+    b: 2,
+    c: new Date(120),
+  });
+});
+
+test('copy with custom replacer', () => {
+  const replacer = (key, value) => (key === 'a' ? 'x' : value);
+  expect(serializer.copy({ a: 1, b: 2, c: new Date(120) }, { replacer })).toEqual({
+    a: 'x',
+    b: 2,
+    c: new Date(120),
+  });
+});
+
+test('serializeToString with custom replacer', () => {
+  const replacer = (key, value) => (key === 'a' ? 'x' : value);
+  expect(serializer.serializeToString({ a: 1, b: 2, c: new Date(120) }, { replacer })).toEqual(
+    '{"a":"x","b":2,"c":{"_date":120}}'
+  );
+});
+
+test('serialize with custom replacer', () => {
+  const replacer = (key, value) => (key === 'a' ? 'x' : value);
+  expect(serializer.serialize({ a: 1, b: 2, c: new Date(120) }, { replacer })).toEqual({
+    a: 'x',
+    b: 2,
+    c: { _date: 120 },
+  });
+});
+
+test('should not deserialize _date now', () => {
+  expect(serializer.copy({ _date: 'now' })).toEqual({ _date: 'now' });
+  expect(serializer.copy([{ _date: 'now' }])).toEqual([{ _date: 'now' }]);
+  expect(serializer.copy({ a: { _date: 'now' } })).toEqual({ a: { _date: 'now' } });
+
+  expect(serializer.deserialize({ _date: 'now' })).toEqual({ _date: 'now' });
+  expect(serializer.deserialize([{ _date: 'now' }])).toEqual([{ _date: 'now' }]);
+  expect(serializer.deserialize({ a: { _date: 'now' } })).toEqual({ a: { _date: 'now' } });
+
+  expect(serializer.deserializeFromString('{ "_date": "now" }')).toEqual({ _date: 'now' });
+  expect(serializer.deserializeFromString('[{ "_date": "now" }]')).toEqual([{ _date: 'now' }]);
+  expect(serializer.deserializeFromString('{ "a": { "_date": "now" } }')).toEqual({
+    a: { _date: 'now' },
+  });
+});
+
+test('deserialize should pass invalid date through without error', () => {
+  expect(serializer.copy({ _date: 'invalid' })).toEqual({ _date: 'invalid' });
+  expect(serializer.copy([{ _date: 'invalid' }])).toEqual([{ _date: 'invalid' }]);
+  expect(serializer.copy({ a: { _date: 'invalid' } })).toEqual({ a: { _date: 'invalid' } });
+
+  expect(serializer.deserialize({ _date: 'invalid' })).toEqual({ _date: 'invalid' });
+  expect(serializer.deserialize([{ _date: 'invalid' }])).toEqual([{ _date: 'invalid' }]);
+  expect(serializer.deserialize({ a: { _date: 'invalid' } })).toEqual({ a: { _date: 'invalid' } });
+
+  expect(serializer.deserializeFromString('{ "_date": "invalid" }')).toEqual({ _date: 'invalid' });
+  expect(serializer.deserializeFromString('[{ "_date": "invalid" }]')).toEqual([
+    { _date: 'invalid' },
+  ]);
+  expect(serializer.deserializeFromString('{ "a": { "_date": "invalid" } }')).toEqual({
+    a: { _date: 'invalid' },
+  });
+});
+
+test('serialize isoStringDates', () => {
+  expect(serializer.serialize(new Date(0), { isoStringDates: true })).toEqual({
+    _date: '1970-01-01T00:00:00.000Z',
+  });
+  expect(serializer.serialize({ a: new Date(0) }, { isoStringDates: true })).toEqual({
+    a: { _date: '1970-01-01T00:00:00.000Z' },
+  });
+  expect(serializer.serialize({ a: [new Date(0)] }, { isoStringDates: true })).toEqual({
+    a: [{ _date: '1970-01-01T00:00:00.000Z' }],
+  });
+});
+
+test('serializeToString isoStringDates', () => {
+  expect(serializer.serializeToString(new Date(0), { isoStringDates: true })).toEqual(
+    '{ "_date": "1970-01-01T00:00:00.000Z" }'
+  );
+  expect(serializer.serializeToString({ a: new Date(0) }, { isoStringDates: true })).toEqual(
+    '{"a":{"_date":"1970-01-01T00:00:00.000Z"}}'
+  );
+  expect(serializer.serializeToString({ a: [new Date(0)] }, { isoStringDates: true })).toEqual(
+    '{"a":[{"_date":"1970-01-01T00:00:00.000Z"}]}'
+  );
+});
diff --git a/packages/serializer/test/stableStringify.test.js b/packages/serializer/test/stableStringify.test.js
new file mode 100644
index 000000000..a156a200d
--- /dev/null
+++ b/packages/serializer/test/stableStringify.test.js
@@ -0,0 +1,244 @@
+// https://github.com/substack/json-stable-stringify
+import stableStringify from '../src/stableStringify';
+
+test('sort keys', () => {
+  let object = {
+    a: 'a',
+    b: 'b',
+    c: 'c',
+  };
+  expect(stableStringify(object)).toEqual('{"a":"a","b":"b","c":"c"}');
+  object = {
+    c: 'c',
+    b: 'b',
+    a: 'a',
+  };
+  expect(stableStringify(object)).toEqual('{"a":"a","b":"b","c":"c"}');
+});
+
+test('toJSON function', () => {
+  const obj = {
+    one: 1,
+    two: 2,
+    toJSON: () => {
+      return { one: 1 };
+    },
+  };
+  expect(stableStringify(obj)).toEqual('{"one":1}');
+});
+
+test('toJSON returns string', () => {
+  const obj = {
+    one: 1,
+    two: 2,
+    toJSON: () => {
+      return 'one';
+    },
+  };
+  expect(stableStringify(obj)).toEqual('"one"');
+});
+
+test('toJSON returns array', () => {
+  const obj = {
+    one: 1,
+    two: 2,
+    toJSON: () => {
+      return ['one'];
+    },
+  };
+  expect(stableStringify(obj)).toEqual('["one"]');
+});
+
+// https://github.com/epoberezkin/fast-json-stable-stableStringify/blob/master/test/str.js
+
+test('simple object', () => {
+  const obj = { c: 6, b: [4, 5], a: 3, z: null };
+  expect(stableStringify(obj)).toEqual('{"a":3,"b":[4,5],"c":6,"z":null}');
+});
+
+test('object with undefined', () => {
+  const obj = { a: 3, z: undefined };
+  expect(stableStringify(obj)).toEqual('{"a":3}');
+});
+
+test('object with null', () => {
+  const obj = { a: 3, z: null };
+  expect(stableStringify(obj)).toEqual('{"a":3,"z":null}');
+});
+
+test('object with NaN and Infinity', () => {
+  const obj = { a: 3, b: NaN, c: Infinity };
+  expect(stableStringify(obj)).toEqual('{"a":3,"b":null,"c":null}');
+});
+
+test('array with undefined', () => {
+  const obj = [4, undefined, 6];
+  expect(stableStringify(obj)).toEqual('[4,null,6]');
+});
+
+test('object with empty string', () => {
+  const obj = { a: 3, z: '' };
+  expect(stableStringify(obj)).toEqual('{"a":3,"z":""}');
+});
+
+test('array with empty string', () => {
+  const obj = [4, '', 6];
+  expect(stableStringify(obj)).toEqual('[4,"",6]');
+});
+
+test('nested', () => {
+  const obj = { c: 8, b: [{ z: 6, y: 5, x: 4 }, 7], a: 3 };
+  expect(stableStringify(obj)).toEqual('{"a":3,"b":[{"x":4,"y":5,"z":6},7],"c":8}');
+});
+
+test('cyclic (default)', () => {
+  const one = { a: 1 };
+  const two = { a: 2, one };
+  one.two = two;
+  try {
+    stableStringify(one);
+  } catch (ex) {
+    expect(ex.toString()).toEqual('TypeError: Converting circular structure to JSON');
+  }
+});
+
+test('cyclic (specifically allowed)', () => {
+  const one = { a: 1 };
+  const two = { a: 2, one };
+  one.two = two;
+  expect(stableStringify(one, { cycles: true })).toEqual('{"a":1,"two":{"a":2,"one":"__cycle__"}}');
+});
+
+test('repeated non-cyclic value', () => {
+  const one = { x: 1 };
+  const two = { a: one, b: one };
+  expect(stableStringify(two)).toEqual('{"a":{"x":1},"b":{"x":1}}');
+});
+
+test('acyclic but with reused obj-property pointers', () => {
+  const x = { a: 1 };
+  const y = { b: x, c: x };
+  expect(stableStringify(y)).toEqual('{"b":{"a":1},"c":{"a":1}}');
+});
+
+test('custom comparison function', () => {
+  const obj = { c: 8, b: [{ z: 6, y: 5, x: 4 }, 7], a: 3 };
+  const s = stableStringify(obj, (a, b) => {
+    return a.key < b.key ? 1 : -1;
+  });
+  expect(s).toEqual('{"c":8,"b":[{"z":6,"y":5,"x":4},7],"a":3}');
+});
+
+test('replace root', () => {
+  const obj = { a: 1, b: 2, c: false };
+  const replacer = () => {
+    return 'one';
+  };
+
+  expect(stableStringify(obj, { replacer })).toEqual('"one"');
+});
+
+test('replace numbers', () => {
+  const obj = { a: 1, b: 2, c: false };
+  const replacer = (key, value) => {
+    if (value === 1) return 'one';
+    if (value === 2) return 'two';
+    return value;
+  };
+
+  expect(stableStringify(obj, { replacer })).toEqual('{"a":"one","b":"two","c":false}');
+});
+
+test('replace with object', () => {
+  const obj = { a: 1, b: 2, c: false };
+  const replacer = (key, value) => {
+    if (key === 'b') return { d: 1 };
+    if (value === 1) return 'one';
+    return value;
+  };
+
+  expect(stableStringify(obj, { replacer })).toEqual('{"a":"one","b":{"d":"one"},"c":false}');
+});
+
+test('replace with undefined', () => {
+  const obj = { a: 1, b: 2, c: false };
+  const replacer = (key, value) => {
+    if (value === false) return undefined;
+    return value;
+  };
+
+  expect(stableStringify(obj, { replacer })).toEqual('{"a":1,"b":2}');
+});
+
+test('replace with array', () => {
+  const obj = { a: 1, b: 2, c: false };
+  const replacer = (key, value) => {
+    if (key === 'b') return ['one', 'two'];
+    return value;
+  };
+
+  expect(stableStringify(obj, { replacer })).toEqual('{"a":1,"b":["one","two"],"c":false}');
+});
+
+test('replace array item', () => {
+  const obj = { a: 1, b: 2, c: [1, 2] };
+  const replacer = (key, value) => {
+    if (value === 1) return 'one';
+    if (value === 2) return 'two';
+    return value;
+  };
+
+  expect(stableStringify(obj, { replacer })).toEqual('{"a":"one","b":"two","c":["one","two"]}');
+});
+
+test('space parameter', () => {
+  const obj = { one: 1, two: 2 };
+  expect(stableStringify(obj, { space: '  ' })).toMatchInlineSnapshot(`
+    "{
+      \\"one\\": 1,
+      \\"two\\": 2
+    }"
+  `);
+});
+
+test('space parameter (with tabs)', () => {
+  const obj = { one: 1, two: 2 };
+  expect(stableStringify(obj, { space: '\t' })).toMatchInlineSnapshot(`
+    "{
+    	\\"one\\": 1,
+    	\\"two\\": 2
+    }"
+  `);
+});
+
+test('space parameter (with a number)', () => {
+  const obj = { one: 1, two: 2 };
+  expect(stableStringify(obj, { space: 3 })).toMatchInlineSnapshot(`
+    "{
+       \\"one\\": 1,
+       \\"two\\": 2
+    }"
+  `);
+});
+
+test('space parameter (nested objects)', () => {
+  const obj = { one: 1, two: { b: 4, a: [2, 3] } };
+  expect(stableStringify(obj, { space: '  ' })).toMatchInlineSnapshot(`
+    "{
+      \\"one\\": 1,
+      \\"two\\": {
+        \\"a\\": [
+          2,
+          3
+        ],
+        \\"b\\": 4
+      }
+    }"
+  `);
+});
+
+test('space parameter (same as native)', () => {
+  // for this test, properties need to be in alphabetical order
+  const obj = { one: 1, two: { a: [2, 3], b: 4 } };
+  expect(stableStringify(obj, { space: '  ' })).toEqual(JSON.stringify(obj, null, '  '));
+});
diff --git a/yarn.lock b/yarn.lock
index dcfe4fbfe..6095c5d67 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2820,6 +2820,26 @@ __metadata:
   languageName: unknown
   linkType: soft
 
+"@lowdefy/serializer@workspace:packages/serializer":
+  version: 0.0.0-use.local
+  resolution: "@lowdefy/serializer@workspace:packages/serializer"
+  dependencies:
+    "@babel/cli": 7.8.4
+    "@babel/compat-data": 7.9.6
+    "@babel/core": 7.9.6
+    "@babel/preset-env": 7.9.6
+    "@lowdefy/type": 1.0.1
+    babel-jest: 24.9.0
+    eslint: 6.8.0
+    eslint-config-airbnb: 18.2.0
+    eslint-config-prettier: 6.12.0
+    eslint-plugin-prettier: 3.1.4
+    jest: 24.9.0
+    jest-diff: 24.9.0
+    prettier: 2.1.2
+  languageName: unknown
+  linkType: soft
+
 "@lowdefy/type@1.0.1, @lowdefy/type@workspace:packages/type":
   version: 0.0.0-use.local
   resolution: "@lowdefy/type@workspace:packages/type"