diff --git a/.eslintrc.js b/.eslintrc.js
index d29e5da..a9f9b74 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -18,7 +18,8 @@ module.exports = {
   },
   plugins: [
     "@typescript-eslint",
-    "eslint-plugin-import"
+    "eslint-plugin-import",
+    "prettier"
   ],
   extends: [
     "eslint:recommended",
@@ -29,6 +30,7 @@ module.exports = {
   ],
   settings: {},
   rules: {
+    "prettier/prettier": "error",
     //doesnt work, it reports false errors
     "constructor-super": "off",
     "@typescript-eslint/class-name-casing": "error",
diff --git a/package.json b/package.json
index a7d80a8..c5a773f 100644
--- a/package.json
+++ b/package.json
@@ -53,6 +53,7 @@
     "@babel/preset-typescript": "^7.8.3",
     "@babel/register": "^7.8.3",
     "@chainsafe/as-sha256": "0.2.0",
+    "@chainsafe/eth2-spec-tests": "0.12.0",
     "@chainsafe/lodestar-spec-test-util": "^0.5.0",
     "@types/chai": "^4.2.9",
     "@types/mocha": "^7.0.1",
@@ -61,6 +62,7 @@
     "chai": "^4.2.0",
     "eslint": "^6.8.0",
     "eslint-plugin-import": "^2.20.1",
+    "eslint-plugin-prettier": "^3.1.4",
     "karma": "^4.4.1",
     "karma-chai": "^0.1.0",
     "karma-chrome-launcher": "^3.1.0",
@@ -70,11 +72,11 @@
     "karma-webpack": "^4.0.2",
     "mocha": "^6.2.0",
     "nyc": "^15.0.0",
+    "prettier": "^2.1.2",
     "ts-loader": "^6.2.1",
     "ts-node": "^8.6.2",
     "typescript": "^3.7.5",
     "webpack": "^4.30.0",
-    "webpack-cli": "^3.3.2",
-    "@chainsafe/eth2-spec-tests": "0.12.0"
+    "webpack-cli": "^3.3.2"
   }
 }
diff --git a/prettierrc.js b/prettierrc.js
new file mode 100644
index 0000000..20baea5
--- /dev/null
+++ b/prettierrc.js
@@ -0,0 +1,11 @@
+module.exports = {
+  printWidth: 120,
+  tabWidth: 2,
+  useTabs: false,
+  semi: true,
+  singleQuote: false,
+  quoteProps: "as-needed",
+  trailingComma: "es5",
+  bracketSpacing: false,
+  arrowParens: "always",
+};
\ No newline at end of file
diff --git a/yarn.lock b/yarn.lock
index 1c7d01c..296f5d6 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2600,6 +2600,13 @@ eslint-plugin-import@^2.20.1:
     read-pkg-up "^2.0.0"
     resolve "^1.12.0"
 
+eslint-plugin-prettier@^3.1.4:
+  version "3.1.4"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-prettier/-/eslint-plugin-prettier-3.1.4.tgz#168ab43154e2ea57db992a2cd097c828171f75c2"
+  integrity sha512-jZDa8z76klRqo+TdGDTFJSavwbnWK2ZpqGKNZ+VvweMW516pDUMmQ2koXvxEE4JhzNvTv+radye/bWGBmA6jmg==
+  dependencies:
+    prettier-linter-helpers "^1.0.0"
+
 eslint-scope@^4.0.3:
   version "4.0.3"
   resolved "https://registry.yarnpkg.com/eslint-scope/-/eslint-scope-4.0.3.tgz#ca03833310f6889a3264781aa82e63eb9cfe7848"
@@ -2808,6 +2815,11 @@ fast-deep-equal@^3.1.1:
   resolved "https://registry.yarnpkg.com/fast-deep-equal/-/fast-deep-equal-3.1.1.tgz#545145077c501491e33b15ec408c294376e94ae4"
   integrity sha512-8UEa58QDLauDNfpbrX55Q9jrGHThw2ZMdOky5Gl1CDtVeJDPVrG4Jxx1N8jw2gkWaff5UUuX1KJd+9zGe2B+ZA==
 
+fast-diff@^1.1.2:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/fast-diff/-/fast-diff-1.2.0.tgz#73ee11982d86caaf7959828d519cfe927fac5f03"
+  integrity sha512-xJuoT5+L99XlZ8twedaRf6Ax2TgQVxvgZOYoPKqZufmJib0tL2tegPBOZb1pVNgIhlqDlA0eO0c3wBvQcmzx4w==
+
 fast-json-stable-stringify@^2.0.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/fast-json-stable-stringify/-/fast-json-stable-stringify-2.1.0.tgz#874bf69c6f404c2b5d99c481341399fd55892633"
@@ -4924,6 +4936,18 @@ prelude-ls@~1.1.2:
   resolved "https://registry.yarnpkg.com/prelude-ls/-/prelude-ls-1.1.2.tgz#21932a549f5e52ffd9a827f570e04be62a97da54"
   integrity sha1-IZMqVJ9eUv/ZqCf1cOBL5iqX2lQ=
 
+prettier-linter-helpers@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/prettier-linter-helpers/-/prettier-linter-helpers-1.0.0.tgz#d23d41fe1375646de2d0104d3454a3008802cf7b"
+  integrity sha512-GbK2cP9nraSSUF9N2XwUwqfzlAFlMNYYl+ShE/V+H8a9uNl/oUqB1w2EL54Jh0OlyRSd8RfWYJ3coVS4TROP2w==
+  dependencies:
+    fast-diff "^1.1.2"
+
+prettier@^2.1.2:
+  version "2.1.2"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.1.2.tgz#3050700dae2e4c8b67c4c3f666cdb8af405e1ce5"
+  integrity sha512-16c7K+x4qVlJg9rEbXl7HEGmQyZlG4R9AgP+oHKRMsMsuk8s+ATStlf1NpDqyBI1HpVyfjLOeMhH2LvuNvV5Vg==
+
 private@^0.1.6:
   version "0.1.8"
   resolved "https://registry.yarnpkg.com/private/-/private-0.1.8.tgz#2381edb3689f7a53d653190060fcf822d2f368ff"