chore: switch to zod for schema validation

src/server/server.ts

@@ -2,7 +2,8 @@ import * as bodyParser from 'body-parser';
 import cors from 'cors';
 import express, { Request, Response } from 'express';
 import helmet from 'helmet';
-import { Validator } from 'jsonschema';
+import { z } from 'zod';
+import { fromZodError } from 'zod-validation-error';
 import { addition } from '../utils/addition';
 import { logger } from '../utils/logger';
 
@@ -12,20 +13,19 @@ server.use(express.json());
 server.use(bodyParser.json());
 server.use(helmet());
 
-const validator = new Validator();
-const schema = {
-  id: '/PostRequest',
-  type: 'object',
-  properties: {
-    value: { type: 'number' }
-  },
-  required: ['value']
-};
+const schema = z.object({
+  value: z.number()
+});
 
 server.post('/', async (req: Request, res: Response) => {
   logger.info(`POST / with ${JSON.stringify(req.body)}`);
-  if (!validator.validate(req.body, schema).valid) {
-    return res.status(400).json({ message: 'Malformed query parameters' });
+
+  try {
+    schema.parse(req.body);
+  } catch (err) {
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    const validationError = fromZodError(err as any);
+    return res.status(400).json({ message: validationError.message });
   }
 
   const { value } = req.body;