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How To Fix - Parsing error: Unexpected Token in React.js or Javascript ?


In this post, we will explore - How To Fix - "Parsing Error: Unexpected Token" in React.


error Parsing error: Unexpected token





ESLint Parsing Error: Unexpected token {



Parsing error: Unexpected token =>



SyntaxError: Unexpected token (
  Such "Unexpected token" signify a common behavioural problem  - somewhere in your code a specific construct was supplied, but the system expected something completely different (based on defined rules\customs). This could be due to a typo mistake, missing something in the code etc. Also could be dev environment and ESLint parsing styles are not compatible owing to the changes for various or upgraded versions. Before we try to fix, Let's do some primitive checks to pinpoint some of the symptoms.  

Primitive Check:

  • What version of React are you using ?
  • Have you considered and cross-checked that you have correctly "imported" everything ?
  • Are you able to compile your code using Babel ?
  • Have you tried babel-eslint parser - the newer name is @babel/eslint-parser
  • Does it work in the Browser ?
  Once you have been through all the above pointers, try the below options.

Try the latest babel eslint and make sure you follow the compatibility matrix.

ESLint

babel-eslint

4.x

>= 6.x

3.x

>= 6.x

2.x

>= 6.x

1.x

>= 5.x

  Node version preferably should be 8+.  

  • Do the install. The "x.x" & "y" below has to be substituted appropriately as per the above table.
 


npm install eslint@**x.x** babel-eslint@**y** --save-dev
OR


yarn add eslint@**x.x** babel-eslint@**y** -D
 

  • Go to the .eslintrc (or .eslintrc.json) config file and make the below changes.
Also check what value you have in ".babelrc".


{
  "parser": "babel-eslint",
}
If above doesn't work, you could also try,


{
 "parser: "@babel/eslint-parser"
}
   

  • If applicable, go to your package.json file and check the below.

"scripts": {
    "lint": "eslint"
},
 

  • You might have two files in your system. There are different versions of ecmaScript with the same name,
    • .eslintrc.js -> es6: true - which was released on June 2015
    • .eslintrc.json -> "ecmaVersion": 2017 - which is equivalent to es8
If the wrong ecmaScript is being picked up in your case, you can try removing the ".eslintrc.js" file (so as to avoid the conflict) and see if that helps to solve the error.  

  • You can also try changing the ecmaVersion in the .eslintrc.json file.
 


"parserOptions": {
      // Required for certain syntax usages
      "ecmaVersion": 2020
},
You could also try other values like 2017, 2018 instead of 2020 You can use one of the below ecmaVersion value to specify what version of ECMAScript syntax to use-

    • 3
    • 5 (default)
    • 6 (also used as 2015)
    • 7 (also used as 2016)
    • 8 (also used as 2017)
    • 9 (also used as 2018)
    • 10 (also used as 2019)
    • 11 (also used as 2020)
    • 12 (also used as 2021)
  Hope this helps to solve the error.  

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