express-joi-validations

import express, { Request, Response, NextFunction } from 'express'; import { Joi, validateHeaders, validateParams, validateBody, expressJoiValidations } from 'express-joi-validations'; const app = express(); app.use(express.json()); // Required to parse JSON request bodies // Optionally configure global settings for all validations app.use(expressJoiValidations({ throwErrors: true, overwriteRequest: false })); const userToken = Joi.object({ authorization: Joi.string().regex(/^[A-Za-z0-9-_]+\.[A-Za-z0-9-_]+\.[A-Za-z0-9-_.+/=]*$/).required(), }); const postId = Joi.object({ id: Joi.string().hex().length(24).required(), }); const postBody = Joi.object({ title: Joi.string().required().trim().min(5), content: Joi.string().required().trim().min(10), tags: Joi.array().items(Joi.string()).optional() }); // Example route with chained validations app.put( '/posts/:id', validateHeaders(userToken), validateParams(postId), validateBody(postBody, { allowUnknown: false }), // Joi options can be passed per validator (req: Request, res: Response) => { // If throwErrors is true, an error handler middleware will catch validation errors. // Otherwise, validation results (errors, values) are on req.validationErrors and req.validationValues const validatedData = (req as any).validationValues; // Cast to 'any' or extend Request type if not using `overwriteRequest` res.status(200).json({ message: 'Post updated successfully', data: validatedData }); } ); // Global error handler for thrown validation errors (if throwErrors: true) app.use((err: any, req: Request, res: Response, next: NextFunction) => { if (err && err.error && err.error.isJoi) { // A Joi validation error return res.status(400).json({ type: err.type, message: err.error.toString() }); } next(err); // Pass on to other error handlers }); const PORT = process.env.PORT || 3000; app.listen(PORT, () => console.log(`Server running on port ${PORT}`));