Creating flexible validation rules in Node.js

Part of the Node Validation Essentials workshop series by Simon Plenderleith.

How to use this project

Run in your browser with StackBlitz

• Open this project in your browser
• Run any of the examples below

Note: Currently only works in Chrome, Edge or Brave browsers.

Set it up locally

• git clone this repository
• Run npm install
• Run any of the examples below

Requires Node.js >= v14.13.0 (how to install).

Dependencies this project uses

• ajv
• fluent-json-schema

Defined in package.json.

Examples

Validation with JSON Schema and Ajv

Run the code in example-ajv.js:

node example-ajv.js

JSON schema generation

Run the code in example-fluent-json-schema.js:

node example-fluent-json-schema.js

Ready for a challenge?

The iceCreamData object in example-ajv.js fails validation against the JSON schema we've defined (iceCreamSchema).

Challenge: Change the schema so the stock property allows for a value which is either an integer or null.

A couple of rules:

• You can only use the Understanding JSON Schema page on the type keyword as a reference — it contains all the information you need for this challenge.

• You can't change the data in the iceCreamData object.

When you run the script and see the message:

The ice cream data is valid! 🍨

...you've completed the challenge.

Good luck!

License

This project is licensed under the MIT License.