JavaScript-Syntax-Verifier

Takes JavaScript code as input and verifies whether it is syntactically valid. It reports the exact line and token where a syntax error occurs, or confirms the code is error-free.

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Supported Constructs

Construct	Example
Variable declaration	var x = 5; let y; const z = "hello";
Array declaration	var arr = [1, 2, 3];
Function definition	function foo(a, b) { return a; }
If / else	if (x > 0) { ... } else { ... }
For loop	for (var i = 0; i < 10; i = i + 1) { ... }
While loop	while (x > 0) { ... }
Return statement	return x;
Assignment	x = 10;

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How to Run

1. Install dependencies

pip install ply

2. Run the verifier

python main.py

3. Choose a construct from the menu

JavaScript Syntax Verifier (PLY)
1. Variable declaration/instantiation
2. Iterative constructs (for/while)
3. Selective constructs (if/else)
4. Function declaration
5. Array declaration
6. Combination of all the above constructs
7. Exit

4. Enter your JavaScript code and type exit to verify

js> var x = 10;
js> if (x > 5) { return x; }
js> exit

--- Verifying Syntax ---
Syntax is valid! No errors detected.

Author

Vivian Sobers E — github.com/VivianSobers