# Validate field against database **URL:** \ **Category:** Get Help\ **Tags:** gform\_field\_validation, serial-number\ **Created:** [September 3, 2020, 6:00pm UTC](https://community.gravityforms.com/t/validate-field-against-database/5998 "2020-09-03T18:00:37Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![MrWebsiteDesigner](https://sea2.discourse-cdn.com/flex020/user_avatar/community.gravityforms.com/mrwebsitedesigner/32/1979_2.png) [@MrWebsiteDesigner](https://community.gravityforms.com/u/MrWebsiteDesigner)\ **Post date:** [September 3, 2020, 6:00pm UTC](https://community.gravityforms.com/t/validate-field-against-database/5998/1 "2020-09-03T18:00:37Z")
What would be the best way to validate a field entry against a database? For example, a customer registers a new product with a serial #. That serial # (and the rest of customer info) gets stored in a database. The customer comes back some time later to do a warranty request. There’s one form field visible asking them for their serial #. The customer types in their serial # and clicks continue. The form then checks the database to see if that serial # exists. If it does, it shows the rest of the form fields to fill out. If it doesn’t, an error message informs them that serial# doesn’t exist. Would this function be done through Gravity Forms and Zapier or Webhooks or something else? I did find this: [https://pastebin.com/7ANQh6Rc](https://pastebin.com/7ANQh6Rc) How would that need to be modified to access a WordPress database as opposed to a .txt file? ---
**Author:** ![chrishajer](https://sea2.discourse-cdn.com/flex020/user_avatar/community.gravityforms.com/chrishajer/32/88_2.png) [@chrishajer](https://community.gravityforms.com/u/chrishajer)\ **Post date:** [September 3, 2020, 7:52pm UTC](https://community.gravityforms.com/t/validate-field-against-database/5998/2 "2020-09-03T19:52:12Z")
To modify that code to refer to a database rather than a text file would require you write the code to connect to the database to perform the validation. This plugin can handle that scenario out of the box: > **[Gravity Forms Populate Anything - Gravity Wiz](https://gravitywiz.com/documentation/gravity-forms-populate-anything/)** > > Dynamically filter and populate field choices and values with posts, users, taxonomies, terms, Gravity Forms entries, and databases. Pretty much anything! If you are open to using that plugin, I recommend contacting Gravity Wiz to ask them how this can be accomplished. Thank you. ---
**Author:** ![richardw8k](https://sea2.discourse-cdn.com/flex020/user_avatar/community.gravityforms.com/richardw8k/32/2354_2.png) [@richardw8k](https://community.gravityforms.com/u/richardw8k)\ **Post date:** [January 4, 2022, 5:55pm UTC](https://community.gravityforms.com/t/validate-field-against-database/5998/3 "2022-01-04T17:55:24Z")