celebrate

celebrate is an express middleware function that wraps the joi validation library. This allows you to use this middleware in any single route, or globally, and ensure that all of your inputs are correct before any handler function. The middleware allows you to validate req.params, req.headers, and req.query. celebrate lists joi as a formal dependency. This means that celebrate will always use a predictable, known version of joi during the validation and compilation steps. celebrate is tested and has full compatibility with express 4 and 5. It likely works correctly with express 3, but including it in the test matrix was more trouble than it's worth. This is primarily because express 3 exposes route parameters as an array rather than an object. Returns a function with the error handler signature ((err, req, res, next)). This should be placed with any other error handling middleware to catch celebrate errors.