Syntax Checker & Code Validator
About TypeScript Syntax Checker
The TypeScript Syntax & Type Annotation Linter checks `.ts` and `.tsx` source code for TypeScript syntax errors, generic bracket mismatches, enum declarations, interface definitions, and type annotation discrepancies client-side without sending code to an external compiler.
How to Use TypeScript Syntax Checker
Step 1
Paste your TypeScript or TSX code into the editor.
Step 2
Toggle TSX mode if checking React component markup.
Step 3
Inspect the instant syntax audit result and highlighted error locations.
Step 4
Click "Copy Report".
Practical Use Cases for TypeScript Syntax Checker
Pre-Commit TypeScript Syntax Verification
Verify complex generic types, interface definitions, and union types before running heavy `tsc` build pipelines.
Debugging TSX & React Component Syntax Breaks
Locate missing closing tags, unescaped JSX characters, and invalid generic arrow function syntax in React components.
Input & Output Examples
Detecting Missing Generic Bracket
`interface User<T { id: T; name: string; }`Status: ❌ TypeScript Error at Line 1, Col 18 | Message: `'>' expected.`
Key Features & Performance
- ✓Validates TypeScript 5.x syntax: decorators, satisfies operator, const type parameters, template literal types.
- ✓Supports both standard TypeScript (`.ts`) and React TSX (`.tsx`) syntax parsing.
- ✓Precise Line & Column error indicator with contextual syntax highlighting.
- ✓100% Client-Side memory execution via TypeScript compiler parser.
- ✓1-Click Copy diagnostic report.
Key Terminology & Definitions
TypeScript AST Parser
The lexical and syntactic parser from the TypeScript compiler (`ts.createSourceFile`) that builds an Abstract Syntax Tree in memory.
Type Assertion vs Cast
Using `as Type` syntax in TypeScript to inform the compiler of a specific variable type without runtime overhead.