Uncaught syntaxerror unexpected number
The uncaught syntaxerror unexpected number error message typically happens while you are working with JavaScript. If you’re wondering and perplexed why it occurs and how to troubleshoot this error message, …
Python & JavaScript SyntaxError Reference: 48+ Parsing & Syntax Fixes (2026)
itsourcecode.com hosts 48+ documented fixes for SyntaxError messages in both Python and JavaScript, the error class raised when the parser encounters code it can’t interpret. Unlike runtime errors, syntax errors are caught before code executes. Most come from missing/extra punctuation, mismatched quotes, missing colons (Python), mixed module/script boundaries (JavaScript ES Modules), or wrong Python version targeting. Browse the fixes below by language.
What is a SyntaxError?
A SyntaxError is raised when the language parser fails to understand your code, meaning the code is structurally invalid before it can run. In Python, SyntaxError is detected at import or first execution; in JavaScript, by the browser or Node.js when the file is loaded. The error message usually points to the line and column where the parser got confused. Often the actual mistake is on the LINE BEFORE the one reported (a missing comma, paren, or colon).
How to debug any SyntaxError in 4 steps
Look at the line BEFORE the reported error. Parsers often only realize something’s wrong on the next line. A missing closing paren on line 10 is often reported as “unexpected token” on line 11.
Match all opening/closing pairs. ( with ), [ with ], { with }, " with ", ' with '. Most syntax errors are one missing or extra character. Editor bracket-matching helps a lot.
Check your Python or Node version. Modern features (walrus operator :=, f-strings, match statement, ESM import.meta) require a specific minimum version. If the syntax is fine but you’re on an old runtime, the parser doesn’t recognize it.
For JSON errors, validate with a JSON formatter. “Unexpected token” in JSON usually means trailing commas, single quotes (JSON requires double), or unescaped characters. Paste into jsonlint.com.
Featured SyntaxError fixes by language
🐍 Python: invalid syntax / EOF / EOL
SyntaxError: invalid syntax (Troubleshooting Guide)
SyntaxError: unexpected EOF while parsing
SyntaxError: EOL while scanning string literal
SyntaxError: unexpected character after line continuation
🐍 Python: statement structure
Expected ‘except’ or ‘finally’ block
Multiple exception types must be parenthesized
Generator expression must be parenthesized
‘return’ outside function
Positional argument follows keyword argument
f-string expression part cannot include a backslash
future feature ‘annotations’ is not defined (Python 3.7+)
🟦 JavaScript: unexpected token
Uncaught SyntaxError: Unexpected number
SyntaxError: Unexpected token ‘export’
Uncaught SyntaxError: missing ) after argument list
Uncaught SyntaxError: Invalid left-hand side in assignment
Uncaught SyntaxError: Invalid or unexpected token
Uncaught SyntaxError: Invalid shorthand property initializer
Uncaught SyntaxError: Unexpected end of input (in promise)
🟦 JavaScript: ES Modules & modern syntax
SyntaxError: Cannot use ‘import.meta’ outside a module
Missing initializer in const declaration
Unexpected reserved word ‘await’ (outside async)
‘import’ and ‘export’ may appear only with sourceType: ‘module’ (ESLint)
📦 JSON parsing errors
Unexpected token ‘o’ in JSON at position 1
Expression.SyntaxError: Token EOF expected (PowerQuery)
Related error categories
SyntaxError is one of 10 hubs in our Python & JavaScript error reference cluster, 980+ documented fixes total:
TypeError Reference, 220+ Python & JS TypeError fixes
ModuleNotFoundError Reference, 198+ Python import errors
AttributeError Reference, 173+ “object has no attribute X” fixes
ValueError Reference, 100+ pandas/NumPy/sklearn fixes
ImportError Reference, 67+ “cannot import name X from Y” fixes
NameError Reference, 49+ “name X is not defined” fixes
RuntimeError Reference, 49+ PyTorch/CUDA/async runtime errors
ReferenceError Reference, 34+ JavaScript “is not defined” fixes
HTTP Error Reference, 35+ HTTP status code fixes (4xx, 5xx)
Python Tutorial, beginner-to-intermediate Python lessons
About this SyntaxError reference
Built since 2015 by PIES Information Technology Solutions, Binalbagan, Negros Occidental, Philippines. Every post comes from a real error encountered in production. Used by 12,000+ developers monthly.
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Syntaxerror generator expression must be parenthesized
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Expression.syntaxerror: token eof expected.
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[Fixed] SyntaxError: Cannot use ‘import.meta’ outside a module — JavaScript ES6
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Uncaught syntaxerror invalid left-hand side in assignment
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[Fixed] SyntaxError: Multiple Exception Types Must Be Parenthesized — Python
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Uncaught syntaxerror: invalid shorthand property initializer
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Expression.syntaxerror: token comma expected.
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Uncaught syntaxerror unexpected token react
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Syntaxerror: unterminated string literal in Python
What is “syntaxerror unterminated string literal”? The syntaxerror: unterminated string literal occurs when there is an unterminated string literal somewhere in your code. In simple terms, Python throws a “SyntaxError: …
Frequently Asked Questions
Why does the SyntaxError point to a line that looks fine?
The parser realizes something is wrong only when it hits a token that does not fit — but the actual mistake (missing paren, missing colon, unmatched quote) is usually on the LINE BEFORE. Always look at the line above the reported error first.
What does "Unexpected token 'o' in JSON at position 1" mean?
The string you tried to parse as JSON is not actually JSON — it starts with "o" which suggests you are parsing the string "object Object" (literally) instead of an actual JSON string. Check what you are passing to JSON.parse(). Common cause: JSON.parse(myObject.toString()) when myObject is already an object — drop the .toString() or use JSON.stringify() first.
What does "Cannot use 'import.meta' outside a module" mean?
import.meta only works in ES modules. To use it: (1) Add "type": "module" to your package.json, OR (2) rename the file to .mjs, OR (3) use a bundler that handles ES module syntax. For Node.js, if you want CommonJS instead, use __dirname / __filename directly (no import.meta needed).
What does "Unexpected token 'export'" mean in Node.js?
You are running ES module syntax in a CommonJS-mode Node.js file. Either set "type": "module" in package.json, use a .mjs extension, or convert to CommonJS: module.exports = ... instead of export .... Same fix applies to import statements.
What does "EOL while scanning string literal" mean?
You opened a string with " or ' but never closed it before the end of the line. Add the closing quote. If the string is supposed to span multiple lines, use triple-quotes (""" or ''') in Python, or template literals (backticks) in JavaScript.
Can I catch SyntaxError with try/except?
Only for dynamic code — strings passed to eval(), exec(), or compile(). SyntaxError in normal source code happens at parse time, before any code in that file runs, so a try/except inside the same file cannot catch it. To detect dynamic syntax errors safely: try: compile(source, '<string>', 'exec') except SyntaxError as e: ...
How often is this SyntaxError reference updated?
New posts are added weekly. Existing posts are revised when major language versions ship syntax changes (Python 3.12 match statement, ES2024). Last refreshed: May 2026.