MongoDB — Validation

Basic Validation

db.createCollection("users", {
  validator: {
    $jsonSchema: {
      bsonType: "object",
      required: ["name", "email"],
      properties: {
        name: {
          bsonType: "string",
          description: "Must be a string"
        },
        email: {
          bsonType: "string",
          pattern: "^.+@.+$",
          description: "Must be valid email"
        },
        age: {
          bsonType: "int",
          minimum: 0,
          maximum: 150
        }
      }
    }
  }
})

Validation Levels

Level	Description
strict	Reject invalid docs
moderate	Allow updates to existing

db.runCommand({
  collMod: "users",
  validationLevel: "moderate"
})

Validation Actions

Action	Description
error	Reject invalid
warn	Log warning

db.runCommand({
  collMod: "users",
  validationAction: "warn"
})

Add Validation

db.runCommand({
  collMod: "users",
  validator: { ... }
})

Mini Practice

1. Add validation rules
2. Test validation
3. Change validation level
4. Remove validation

Up Next

Continue with Security — MongoDB security.