diff --git a/desafio-14/guiribeirodev/javascript/.valid b/desafio-14/guiribeirodev/javascript/.valid
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@@ -0,0 +1 @@
+1caf27399c62528bd7452ad78f682c8cc
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diff --git a/desafio-14/guiribeirodev/javascript/README.md b/desafio-14/guiribeirodev/javascript/README.md
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+# Versão do Node :package:
+
+Utilizado a versão mais recente LTS do Node (18.16.1). Porém deve funcionar desde a versão (14.15.0).
+
+# Como rodar o programa :wrench:
+
+Para rodar o programa basta digitar:
+  ```
+  $ node index.js "filepath"
+  ```
+
+No caso o filepath seria o arquivo com as expressões, ex "d14.txt".
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diff --git a/desafio-14/guiribeirodev/javascript/index.js b/desafio-14/guiribeirodev/javascript/index.js
new file mode 100644
index 000000000..990d4c145
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+++ b/desafio-14/guiribeirodev/javascript/index.js
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+const fs = require("fs");
+
+function get(file) {
+    try {
+        const data = fs.readFileSync(file, "utf8").split("\n");
+        const expressions = [];
+
+        for (let expression of data) {
+            if (expression !== "") {
+                expression = expression.split(" ").join("");
+                expressions.push(expression);
+            }
+        }
+
+        return expressions;
+    } catch (err) {
+        console.error(err, "Read Failed");
+        return err;
+    }
+}
+
+function isValidExpression(expression) {
+    const haveParentheses = expression.includes("(");
+
+    if (haveParentheses) {
+        expression = expression.split("");
+
+        const amountOpeningParenthesis = expression.reduce(
+            (count, char) => (char === "(" ? count + 1 : count),
+            0
+        );
+
+        const amountClosingParenthesis = expression.reduce(
+            (count, char) => (char === ")" ? count + 1 : count),
+            0
+        );
+
+        if (amountOpeningParenthesis !== amountClosingParenthesis) {
+            return false;
+        }
+    }
+
+    for (let i = 0; i <= expression.length; i++) {
+        const operators = ["+", "-", "*", "/", "^"];
+
+        const currentChar = expression[i];
+        const nextChar = expression[i + 1];
+
+        if (operators.includes(currentChar) && operators.includes(nextChar)) {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+function infixToPostfix(expression) {
+    const precedence = {
+        "+": 0,
+        "-": 0,
+        "*": 1,
+        "/": 1,
+        "^": 2
+    };
+
+    const result = [];
+    const stack = [];
+
+    for (const token of expression) {
+        const isNumber = !isNaN(token);
+
+        if (isNumber) {
+            result.push(token);
+        } else if (token === "(") {
+            stack.push(token);
+        } else if (token === ")") {
+            while (stack[stack.length - 1] !== "(") {
+                const lastOperator = stack.pop();
+
+                result.push(lastOperator);
+            }
+
+            stack.pop();
+        } else {
+            while (stack[stack.length - 1] &&
+        precedence[token] <= precedence[stack[stack.length - 1]]
+            ) {
+                const lastOperator = stack.pop();
+
+                result.push(lastOperator);
+            }
+            stack.push(token);
+        }
+    }
+
+    while (stack.length > 0) {
+        result.push(stack.pop());
+    }
+
+    return result;
+}
+
+function solvePostfixExpression(expression) {
+    const stack = [];
+
+    for (const token of expression) {
+        const isNumber = !isNaN(token);
+
+        if (isNumber) {
+            stack.push(parseInt(token));
+        } else {
+            const operand1 = stack.pop();
+            const operand0 = stack.pop();
+
+            switch (token) {
+                case "+":
+                    stack.push(operand0 + operand1);
+                    break;
+                case "-":
+                    stack.push(operand0 - operand1);
+                    break;
+                case "*":
+                    stack.push(operand0 * operand1);
+                    break;
+                case "/":
+                    if (operand1 === 0) {
+                        return "ERR DIVBYZERO";
+                    }
+                    stack.push(operand0 / operand1);
+                    break;
+                case "^":
+                    stack.push(operand0 ** operand1);
+                    break;
+            }
+        }
+    }
+    const result = stack.pop();
+
+    return result;
+}
+
+function main() {
+    const file = process.argv[2];
+    const data = get(file);
+
+    for (let expression of data) {
+        const isValid = isValidExpression(expression);
+
+        if (!isValid) {
+            console.log("ERR SYNTAX");
+            continue;
+        }
+
+        expression = expression.split(/([()+\-/*^])/).filter(Boolean);
+
+        const postfix = infixToPostfix(expression);
+
+        const result = solvePostfixExpression(postfix);
+
+        console.log(result);
+    }
+}
+
+main();