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ES Modules and CommonJS

SyntaxError: Cannot Use Import Statement Outside a Module

Static import only works in an ECMAScript Module context. The script type must be module in the browser; in Node.js, the file extension, the nearest package.json file's type field, and the used runtime version must be consistent.

ES ModuleCommonJStype=modulepackage.json.mjs
DevTools Console
SyntaxError: Cannot use import statement outside a module
Warning: To load an ES module, set "type": "module"
import declarations may only appear at top level of a module
01Log first Console error
02Separate source code and live answer
03Test Parser, Network and module structure
04Re-verify after build
01
technical approach

Import Statement Outside Module How to analyze?

Static import only works in an ECMAScript Module context. The script type must be module in the browser; in Node.js, the file extension, the nearest package.json file's type field, and the used runtime version must be consistent.

01

Find the first mistake

A SyntaxError may stop all subsequent scripts; First resolve the first red record in the Console.

02

Open the actual file

Determine whether the error is source or build with Source map, pretty print and Network URL.

03

Isolate with parser

Reduce the issue to a small area with node --check, ESLint, TypeScript or JSON validator.

04

Verify live output

Check the PHP render, API body, CDN cache and module loader result in the production answer.

Do not mix import and require randomly in the same file.

02
Live error dictionary

Console and terminal messages

01kritik

Cannot use import statement outside a module

Meaning: File is being parsed as CommonJS or classic script.

Possible cause: type module, .mjs or script type missing.

02warning

Browser import declaration error

Meaning: The browser does not recognize the script as a module.

Possible cause: type=module eksik.

03warning

Node warns type module

Meaning: Node .js file accepts CommonJS.

Possible cause: package.json type field is missing.

04warning

require is not defined in ES module

Meaning: The CommonJS API is being used in an ESM file.

Possible cause: Mixed module sistemi.

05warning

__dirname is not defined

Meaning: ESM’de CommonJS globali yok.

Possible cause: Module system changed.

06warning

Unknown file extension .ts

Meaning: Node TypeScript source file is executed directly.

Possible cause: Loader/derleme yok.

07warning

Jest import error

Meaning: Test runner ESM/transform configuration is missing.

Possible cause: Babel/ts-jest setting.

08bilgi

Import must be at top level

Meaning: Static import used in a block/function.

Possible cause: Incorrect location.

No records matching this expression were found.

03
Copiable controls

Node.js, API, PHP and file tests

Node version

node -v

Displays the running Node.js version.

Package tipi

node -e "const p=require('./package.json'); console.log(p.type,p.main,p.module)"

package.json shows module fields.

File parser test

node --check src/app.js

Tests if the file is parsed in the current module's comment.

Show the nearest package.json

node -e "const fs=require('fs'),p=require('path'); let d=process.cwd(); while(true){const f=p.join(d,'package.json'); if(fs.existsSync(f)){console.log(f);break} const n=p.dirname(d); if(n===d)break; d=n}"

Finds the closest package.json location that the Node can be affected by.

TypeScript setting

npx tsc --showConfig

Shows the real tsconfig module, target and moduleResolution settings.

Browser module header

curl -sI https://example.com/assets/app.js | grep -iE '^HTTP|content-type|cache-control'

Displays the module's access and MIME information.

04
Correct and incorrect code

Syntax comparisons

Browser classic script

incorrect
<script src="/app.js"></script>
True
<script type="module" src="/app.js"></script>

Node CommonJS

incorrect
import fs from 'node:fs';
True
const fs = require('node:fs');

Node ESM package

incorrect
{"name":"app"}
True
{"name":"app","type":"module"}

Import within block

incorrect
if (aktif) { import x from './x.js'; }
True
if (aktif) { const x = await import('./x.js'); }
05
According to working environment

Browser, Node.js, PHP and WISECP

Browser and Frontend

Chrome DevTools Console, Sources, and Network panels should be examined together with real file, line, and server response.

  • Find the actual source line with pretty print and source map.
  • Check if the response is returned as HTML instead of JavaScript/JSON using Network Response.
  • Verify script type, load order, defer, and module settings.

Node.js, TypeScript, and Packages

Node version, package.json module type, build output, and the actual file run should comply with the same module system.

  • Isolate the parser error with node --check.
  • Evaluate package.json, tsconfig, and file extensions together.
  • Verify if the build output is executed or not instead of the source.

PHP, AJAX and WISECP

PHP warnings, theme HTML, redirects, and double script loading JavaScript errors may appear.

  • Verify API response does not contain PHP warning or HTML mix.
  • Manage json_encode and Content-Type output.
  • Do not load the same JavaScript file twice within the header/footer.
Incorrect interventions

Absolutely don't

  • Do not mix import and require randomly in the same file.
  • Do not change the package.json type field without evaluating all dependency impacts.
  • Do not run the TypeScript source file with node without build/loader.
  • Do not assume that testing the browser module via file:// and CORS result is production behavior.
Post-procedure check

Verify the solution

  • Node file is executed in the target ESM or CommonJS format.
  • The browser is loading the script with type=module and correct MIME.
  • TypeScript build output compatible with package module system.
  • Test runner and production runtime are using the same module assumption.
06
Internal SEO content set

Related JavaScript error solutions

07
primary sources

MDN, Node.js and official documentation

08
Frequently asked questions

Import Statement Outside Module Curiosities about

Import Statement Outside Module why does it occur?

It occurs when the JavaScript parser, JSON parser, or module loader cannot find the expected grammar.

Is the line in the console always correct?

The line is usually where the parser detects the error. Missing quotes, parentheses, or commas may be in the previous line.

How to find an error in a minified file?

Use source map and DevTools pretty print; correct the original source file and rebuild.

Why does PHP produce a JavaScript SyntaxError?

PHP warning, HTML error page or unpadded data pressed may break JavaScript/JSON syntax.

Does ESLint find all SyntaxError errors?

Most parsers find most errors; however, incorrect server response, double script loading, and runtime module configuration should also be checked.

Code was working, why did it suddenly fail?

Deploy, minify, cache, package update, Node version, PHP output or half-loaded file behavior may have changed.

Does this guide provide a secure production fix?

Provides diagnostic and safe repair steps; changes should be tested in the staging environment and reverted using Git.

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