In this Hasty Treat, Scott and Wes talk about client- and server-side validation, and what each is used for! Netlify - Sponsor Netlify is the best way to deploy and host a front-end website. All the features developers need right out of the box: Global CDN, Continuous Deployment, one click HTTPS and more. Hit up netlify.com/syntax for more info. Show Notes 02:49 - Wes’ story 06:28 - What is the role of client-side validation? Help the user input the correct data as they type it. Show correct data in UI. Show correct UI. Just about all of these things are for the user’s benefit, and how they feel when using the site. 11:10 - What is the role of server-side validation? Validate that all the data is correct before it’s saved to the database Security first and foremost 15:03 - What process should a store follow to validate on the server? Check that correct types are coming in. Very easy with Graphql. Get current stock and price information from unique ids from the database. Confirm that this information is what the user is expecting — if the UI said the user will be charged $40, don’t charge them $50 just because of the updated info. In that case, send back to the user. 17:17 - What do you do if you don’t want people messing with your React state? @fvilers/disable-react-devtools if (process.env.NODE_ENV === 'production') disableReactDevTools() We do this on LUT. Why? Because it’s a deterrent. Links uses.tech Flipp App GraphQL Tweet us your tasty treats! Scott’s Instagram LevelUpTutorials Instagram Wes’ Instagram Wes’ Twitter Wes’ Facebook Scott’s Twitter Make sure to include @SyntaxFM in your tweets