SyntaxError: Unexpected token
This error matches known, documented patterns with reliable solutions.
Quick Fix (Most Common Solution)
- Check the line number mentioned in error
- Update Node.js to latest LTS
Seeing "SyntaxError: Unexpected token"? This error can be frustrating, but it's usually fixable. It typically affects your development workflow or system. Below you'll find clear, step-by-step solutions to resolve this issue.
What This Error Means
The JavaScript parser encountered an unexpected character or keyword.
Frequently documented in developer and vendor support forums.
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Common Causes
- Typo in code
- Using ES6+ in old Node version
- Missing semicolon or bracket
How to Fix
- Check the line number mentioned in error
- Update Node.js to latest LTS
- Use a linter like ESLint
Last reviewed: April 2026 How we review solutions
Version Notes
Node.js Version Boundaries for Modern JavaScript Syntax
?.) requires Node 14+. Nullish coalescing (??) also requires Node 14+. Top-level await in ESM files requires Node 14.8+. Logical assignment operators (||=, &&=, ??=) require Node 15+. Private class fields (#field) require Node 12+. Static class blocks require Node 16.9+.
The error is often invisible locally but breaks production if your deployment target runs an older Node version. This commonly happens on VPS deployments where Node is installed via the system package manager: apt install nodejs on Ubuntu 20.04 LTS installs Node 10 or 12 by default, not the current LTS. Always run node --version on your production server and compare with your local version.
A .nvmrc or engines field in package.json documents the minimum required Node version and prevents version drift across contributors and CI pipelines. For TypeScript projects, the target field in tsconfig.json controls which JavaScript version is emitted — mismatches between target and the actual Node runtime produce this error even when the TypeScript source itself compiles cleanly.Optional follow-up
Some users ask whether saving fixes for recurring errors would be useful when the same issue appears again.
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Frequently Asked Questions
What causes unexpected token?
Usually a typo, missing bracket, or unsupported syntax for your Node version.
How do I support ES modules?
Add "type": "module" to package.json or use .mjs extension.
Related Resources
Also Known As
- Node.js error
- Node runtime error
- JavaScript server error
- Node exception
Common Search Variations
- "node js error fix"
- "node command not working"
- "node app crashing"
- "javascript server error solution"
- "node runtime crash fix"
- "how to debug node error"
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