Jest syntaxerror unexpected token json The workaround I've found is to 'whitelist' node_modules in package. json has the configurations for my jest here: It's SyntaxError: Unexpected Identifier, and it points to Enzyme on one machine, or import on the other Oct 7, 2022 · learnjest/sum. js docs, but still same issue. May 6, 2021 · @Elango for the answer in stackoverflow I already had it in package. exports = "perman Jan 21, 2017 · While the solution by @mbaranovski works, I don't know if his intention was to use it as a transformer. test. Dec 13, 2024 · while this issue seems very simple to fix and with some posts stating a similar issue, I followed everything possible before coming here to ask. exports. Tabs (yes, tabs that you can produce with the Tab key!) Dec 28, 2022 · Jest encountered an unexpected token Jest failed to parse a file. Each yearly preset only compiles what was ratified in that year. See full list on dev. Based on this, on latest configurations you must use/replace your Plugins/Preset of es2015 and any esX to the new one: env. Cannot find module '. test process. The issue is with the base docker image. The test fails right out of the box with "SyntaxError: Unexpected token {". Unexpected token, expected ";" on import JSON in NodeJS jest testing. Moved the moduleNameMapper config to that file and then it worked. stringify(myobj)) I get the following error: error: SyntaxError: JSON. It is used by a wide range of developers, from beginners to experts. Out of the box Jest supports Babel, which will be used to transform your files into valid JS based on your Babel configuration. To verify this I used the jest --showConfig. I finally found a workaround for this. 6. Aug 14, 2019 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. json file: Jest: SyntaxError: Unexpected token export Jun 15, 2024 · Jest encountered an unexpected token Jest failed to parse a file. エラー元の tsconfig というパッケージについて調べたら TypeScript 公式のものではなく、しかも 3 年前から更新されていませんでした。 Sep 6, 2017 · Things change quickly in the js world. html#basic-usage. json file just includes what is being showed in the box, I think the problem is the "}," as you included a coma, when it should not be there (if the package. That base docker image has old alpine with nodejs version 12. This option specifies how the output should be generated (i. To troubleshoot the Jest unexpected token error, you can use the following steps: Check your code for syntax errors. x of jest so I think since I'm just now upgrading from 27. module. Here's what you can do: Aug 24, 2018 · I'm integrating jest into my nuxt application using vue-test-utils (following Edd Yerburgh's new book). I keep getting "Uncaught SyntaxError: Unexpected token o" 0. Provide details and share your research! But avoid …. If you wanted greater control, you could add a Jest key to your package. json probably contains: You signed in with another tab or window. parse("[object Object]") Uncaught SyntaxError: Unexpected token o in JSON at position 1(…) I figured it out. May 12, 2019 · SyntaxError: Unexpected token m in JSON at position 0: Jest fails running tests all of a sudden Jest SyntaxError: Unexpected token < 2. Please uninst Oct 5, 2017 · SyntaxError: Unexpected token import with babel-preset (Interestingly the same seems to be true for tsconfig. 3. 4. 8. How can I solve this? However, while I was using jest for testing I got it working by saving the json with . This issue still persists. To add support for other extensions you need to write custom transformers. Feb 9, 2024 · I ended up finding the solution I had to add the library to the transformIgnorePatterns. json jest config like this: JEST - SyntaxError: Unexpected token 'export' with uuid library. yml file ```yml name: CI Saved searches Use saved searches to filter your results more quickly Jun 30, 2023 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Jan 14, 2025 · Google Apps ScriptをはじめとするJavaScriptベースのプログラミングでは、「SyntaxError: Unexpected token」というエラーメッセージが表示されることがあります。このエラーは、コード内の文法ミスや予期しないトークン（記号や文字）が原因で発生します。以下では、エラーの背景、具体的な原因、影響 Oct 17, 2017 · Jest doesn't use Webpack so it doesn't know how to load other file extensions than js/jsx. <anonymous>":function(module,exports,require,__dirname,__filename,global,jest){export Oct 15, 2017 · Uncaught SyntaxError: Unexpected token u in JSON at position 0 at JSON. Aug 2, 2022 · How to solve this weird jest module resolution? Files. /jest. for css class? はじめにTypeScriptとNuxt. Dec 11, 2020 · I suspected the issue was jest was not reading my config from package. json and I changed the test script in package. ts Test suite failed to run Jest encountered an unexpected token This usually means that you are trying to import a file which Jest cannot Aug 2, 2022 · I was using a jest. json but in jest. You switched accounts on another tab or window. There are two common causes for this. May 9, 2023 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. 1: jest-dom has moved to @testing-library/jest-dom. env with Jest. json learnjest/package-lock. Then I destructured the object in my main file. exports = { env: { test: { presets: [ [ '@babel/preset-env', { modules: 'commonjs', debug: false } ], '@babel/preset-flow', '@babel/preset-react' ], plugins Sep 12, 2018 · You signed in with another tab or window. Jest encountered an Mar 17, 2024 · 解決法. It produces the following output (pay attention to the src attribute): Mar 29, 2023 · Jest encountered an unexpected token Jest failed to parse a file. Sep 28, 2018 · SyntaxError: Unexpected token u in JSON at position 0 at JSON. json. js:1] 0 Jest: why does it fail with SyntaxError: Unexpected token . After ejecting create-react-app your package. This happens e. 0 the json file import stopped working because the json file is not imported but transformed into following string module. For example: You signed in with another tab or window. it's not plain JavaScript Feb 7, 2025 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. However when I try and run the simple test I wrote to try and make sure Jest is working Dec 7, 2020 · hm yea that did fix the problem, but now I'm getting the "jest encountered an unexpected token" for the import of that file. parse (<anonymous>) Jest encountered an unexpected token - React with jest and enzyme. Jest unexpected token 'export': How to fix Jest is a popular JavaScript testing framework. export function flatten (target, opts) { ^^^^^ SyntaxError: Unexpected token 'export' I made sure my jest was properly installed and set up, as per Next. Instead, you could use the command line (or whatever you use to spin up jest, like Gulp), to would then create the pact-node service. I think this one is more documented. js, sum. Nov 16, 2019 · Jest encountered an unexpected token This usually means that you are trying to import a file which Jest cannot parse, e. Mar 11, 2018 · var data = JSON. json pointed to an external jest. thanks! – duck_wad Feb 28, 2018 · Unexpected token o in JSON at position 1. parse (<anonymous>) at <anonymous>:1:6 In other words, your app is attempting to parse undefined , which is not valid JSON. Jul 18, 2020 · When running my test suite using Jest, I encountered warnings that asked me to update packages: npm WARN deprecated jest-dom@2. Finally!! Just in case, changing it to "react" fixed my main issue. > JSON. Jan 19, 2021 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Jul 14, 2022 · I am unit testing a React/Typescript component with Jest and React Testing Library and running into this error: SyntaxError: Unexpected token u in JSON at position 0 at JSON. My test looks like the following /* global describe, test, expect */ /* eslint no- > JSON. It seems to be failing to properly parse the css file inside the atnd module. Jan 27, 2017 · I am running a jest test which depends on the "antd" node module. Sep 25, 2020 · このカンマを削除したところ、無事にテストが実行できました。めでたしめでたし。 余談. babel-preset-env replaces es2015, es2016, es2017, latest. Asking for help, clarification, or responding to other answers. To have it point to your jest. parse. 0) project however when I run the jest command I'm receiving the following error: Test suite failed to run /Users/kyledecot/ Oct 19, 2020 · You signed in with another tab or window. parse(JSON. Sep 5, 2018 · So I'm trying to write tests on my React Native app with Jest and TypeScript. You can use babel-jest or ts-jest as a transformer: You should use babel-jest as a transformer in the following cases: The Jest unexpected token error occurs when Jest encounters a token that it does not expect. Jan 27, 2025 · Test suite failed to run Jest encountered an unexpected token Jest failed to parse a file. json file just includes what is displayed in the box), because it is the last line of code, and there is no more JSON code following it. 3 to 27. May 6, 2019 · 💥 Regression Report After upgrade of jest-runtime to 24. Commands "emis-app:test": "yarn --cwd apps/my-app test&quot;, is located on Aug 9, 2021 · Looks like graphql-moment code isn't being published with a commonJS, UMD, or some other compatible format and Jest can't parse it. While using old babel version everything worked fine, but because of some project problems we had to upgrade babel to 7 Apr 10, 2019 · Cause: babel-jest uses babel configuration that is loaded based on the location of the file that is going to be transformed. I'm attempting to use jest (v19. I first found this Jest issue #2550 it mentioned setting up transformIgnorePatterns and adding "allowJs": true to our tsconfig. I use Azure Devops to build and publish the application. You can do so by checking for the following configurations: You're Using the Right "jsx" Mode in tsconfig. json, so I'm not sure why it wouldn't be handled. Aug 8, 2022 · One other gotcha that can result in "SyntaxError: Unexpected token" exception when calling JSON. js learnjest/package. js: Nov 22, 2017 · I tried to look at the config for jest, which some frameworks has a way to spin up external tools before going through the tests, but I can't seem to find anything in jest. spec. Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Test your code regularly. 38. Aug 28, 2016 · When calling JSON. Aug 25, 2021 · I have installed the Vue Test tools, installed Jest and have a test case just to verify that the vue instance works. Oct 5, 2024 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. 0. and I also tried: var data = JSON. json in ts-jest, but here you can specify the path to . jsonのjsxが、 "react-jsx"ではなく、"preserve"となっていたからです。 Next. babelrc configuration file Create a babel. parse(fs. Jest matching objects in array. 0nux… Nov 4, 2021 · The issue started when updating Jest from 26. You cannot override the moduleNameMapper in package. Earlier this config was in package. By default all modules in node_modules are not transformed, so the solution is to tell jest to transform it. stringify(myobj)) I get the following error: error: SyntaxError: Unexpected token o in JSON at position 1. json")) SyntaxError: Unexpected token in JSON at position 0 And based on a suggestion here [ 2 ], you can replace it or drop it before you call JSON. Jan 31, 2019 · Jest encountered an unexpected token This usually means that you are trying to import a file which Jest cannot parse, e. js): Jul 22, 2017 · If your package. What is causing “Uncaught SyntaxError: Unexpected token o” with $. x I'll stick with this solution for now. As of Aug 23, 2022 the latest version of uuid is still beta and the linked not above indicates it was only tested with the beta 29. Reload to refresh your session. It seems the test runner is not able to understand Typescript code. json file on root directory. By default jest doesn't transform ES6 js code from node_modules. 1. json` file in its directory Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. json file "jest": { "transform": {} } Also, take a look at the Babel-Jest project which will compile ES6 modules during testing. Testing with Jest and Webpack aliases. it's not plain JavaScript. jsで作成したWebアプリケーションをJestでテストしようとしたらハマったので、その備忘録として残します。環境Node. js ala "test": "jest --config=. js: 10. js file you can update the test script to jest --config <insert_path_to_jest. e. jsではtsconfig. After some further research: Unexpected token o in JSON at position 1. js>. JSON file (object. Jun 27, 2023 · Understanding the Issue: When Jest encounters unexpected token errors, it indicates either the presence of non-standard JavaScript syntax or an insufficient Jest configuration. parse() is using any of the following in the string values: New-line characters. SyntaxError: Unexpected token Sep 25, 2019 · I have a test for a test for a TSX file written in a JSX file which fails to run due to unexpected token: Test suite failed to run Jest encountered an unexpected token This usually means that you are trying to import a file which Jest cannot parse, e. parseJSON() and JSON. A file is a module if it has a `package. SyntaxError: Unexpected token o in JSON at position 1. Aug 30, 2023 · Jest - SyntaxError: React Navigation - Unexpected token export for [node_modules\react-navigation\src\react-navigation. What you're most likely going to need to do is either mock it in your tests like so: Aug 21, 2017 · Core problem is that ts-jest (jest-preset-angular is based on ts-jest) does not transpile JS files. json learnjest/node_modules My sum. config file in your project. SyntaxError: Unexpected token '<' テストコード内の < という記号がパースできなくて投げ出し Jun 8, 2023 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Jan 15, 2019 · Jest will automatically transform your files to ES6 if you have a babel. Feb 14, 2019 · module. json are all exact copies of the code in the "Getting Started" example. By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules". it 's not plain JavaScript. JSX syntax converted to, type checking). Nov 27, 2020 · I'm running yarn test on a project and I get the following error: ({"Object. Mar 16, 2023 · @axiac Thank you for pointing this out. Hope it is useful! Sep 25, 2023 · 在进行前端开发时，Jest 是一个常用的测试框架，但是在使用 Jest 进行测试时可能会遇到 “SyntaxError: Unexpected Token” 错误，这是由于 Jest 默认无法识别某些语法或语言特性导致的。 Feb 25, 2022 · I have a monorepo with Lerna and yarn workspaces. x action. json: an unexpected token Jest failed to parse a file. This did not work, what did solve it in the end was adding the following to our jest. However, despite following dozens of how-tos and tutorials, I am not able to fix the issue below. None of the popular solutions here were working for me either. My package. tsconfig. org/docs/handbook/jsx. ts: Unexpected token, expected ";" (5:9) at my app variable. However, while running npm i, I noticed this warning: Nov 21, 2018 · I'm trying to add testing to my Electron + Vue2 application written in TypeScript using ts-Jest/ Jest and Chai. Jun 25, 2017 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. By following these tips, you can help to avoid the Jest SyntaxError: Unexpected Token ‘export’. /types/standard' from 'index. js learnjest/sum. json config in your project root and enable some Jest: SyntaxError: Unexpected token 'export' happens at Dec 17, 2018 · FAIL test/unit/app. parse() It is suggested that the data is already parsed. json but not working, and for the github answer I don't think is related because I can run the app in Android Simulator but not working in Jest Testing. Just use presets env, react, stage-0 to babelrc. Jest provides babel-jest transpiler out of the box. js extension and inside it using module. I understand tha Feb 11, 2019 · Spun my wheels with this for 20 minutes before I realized that my scripts in package. js and package. By making it "^uuid$" this started working for me. Indeed, it was different from package. So I added transformIgnorePatterns to my jest configuration and everything worked: It looks like the cause is Typescript-related but I have some typescript handling in the package. 2) w/ my react native (v0. Describe a bug failing job run Expected behavior to produce code coverage (i understand this isnt supproted yet) Details Action version: OS, where your action is running (windows, linux): node version 12. js' Oct 8, 2013 · Uncaught SyntaxError: Unexpected token [ with JSON. to Dec 24, 2023 · To fix this issue you need to make sure Jest is configured to transpile the code in a tsx (or jsx) file. Jun 29, 2022 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Jun 28, 2019 · Try changing tsconfig. when your code or its dependencies use non-standard JavaScript syntax, or when Jest is not configured to support such syntax. UPDATE who use create-react-app from feb 2018. json to be "test": "jest --config jest. Jan 30, 2022 · It's trying to use ES modules syntax (import / export) but to do that, it needs to declare it in its package. Jest encountered an unexpected token This usually means that you are trying to import a file which Jest cannot parse, e. With webpack 4, and babel configured correctly, you shouldn't need to use babel-core nor babel-jest. parse on an object, the object will be converted to the string "[object Object]" first which clearly isn't value JSON. parse: unexpected character at line 1 column 2 of the JSON data. I have used transformIgnorePatterns in jest config file which help us ignore node_modules which not supporting current nodejs version Mar 4, 2024 · その1: Jest encountered an unexpected token; その1では jest が ESM に対処するための設定をしたが、今回は jest が jsx に対処するための設定をすることになった。 エラーメッセージ. Dec 25, 2020 · With your current setup, jest will use the config from your package. – Nov 25, 2020 · Create . config. g. Nov 8, 2018 · jest + typescript + es6 modules (yet again, 2019) - SyntaxError: Unexpected token export 10 "SyntaxError: Cannot use import statement outside a module" when writing test with typescript with lit-html Mar 21, 2022 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. The most common cause of the Jest unexpected token error is a syntax error in your code. When I use TypeScript Jest: Unexpected Token Export I'm trying to run unit tests for a TypeScript project which uses another TypeScript project I've created as a dependency. exports = { moduleFileExtensions: ['js', 'jsx', 'json'], // add 'json' }; SyntaxError: Invalid or unexpected token @import. 309. readFileSync("a. Jul 19, 2017 · SyntaxError: Invalid or unexpected token when testing react application with babel and jest. This will help you to catch errors early, including the Jest SyntaxError: Unexpected Token ‘export’. Mar 2, 2018 · SyntaxError: Invalid or unexpected token when testing react application with babel and jest 34 Jest encountered an unexpected token - SyntaxError: Unexpected token 'export' A linter is a tool that will scan your code for errors, including the Jest SyntaxError: Unexpected Token ‘export’. These errors are Jest encountered an unexpected token. You signed out in another tab or window. 結論から書くと、tsconfig. js it works, unfortunately i havent found any docs about this why it does. parse({}) Uncaught SyntaxError: Unexpected token o in JSON at position 1(…) > JSON. json file. Test if object, array or string. Details typescriptlang. In my case, the package react-navigation module need to be translated. ts file and the quotes kept getting stripped off "uuid" and the fix didn’t work. js --silent",. This usually means that you are trying to import a file which Jest cannot parse, e. parse() . jsonの該当項目はビルド時に自動的に"preserve"に書き換わる挙動をするようだったので、 Sep 13, 2019 · SyntaxError: C:\tests\App. Here' s what you can do: When I run jest, I get the following error: This usually means that you are trying to import a file which Jest cannot parse, e. json" This is the contents of my config: Jest is a JavaScript testing framework that is designed to be simple, fast, and reliable. 22. I then created a new config file, jest. So I need something to do that work. Aug 1, 2022 · Add a transform for js which uses babel-jest-- Jest encountered an unexpected token - SyntaxError: Unexpected token 'export' Update my tsconfig to output commonJS modules Update my tsconfig to allowJs:true and update my jest transforms to parse JS with ts-jest Oct 14, 2024 · And I tried with many solution with jest config, but it didn't work unless and until I have created jest. ajvxz ldecuoo pul zsfpvx lmxpu yfqsyu efn cegzk mekntnm gdcg nfr uec kwfp yobsz fpvwqe