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Age Verification

You can verify someone's age without learning their date of birth nor their actual age.

These examples use the @zkpassport/ui card. The query you build is what matters — see Basic Usage for how to use the SDK directly instead.

Verify if the user is over 18 years old​

You will not learn their date of birth nor their actual age, only that they are 18+.

import { ZKPassportQRCode } from "@zkpassport/ui/react";

<ZKPassportQRCode
  name="ZKPassport"
  logo="https://zkpassport.id/logo.png"
  purpose="Prove you are 18+ years old"
  scope="adult"
  query={(queryBuilder) => queryBuilder.gte("age", 18).done()}
  onResult={({ verified, result }) => {
    if (verified) {
      const isOver18 = result.age.gte.result;
      console.log("User is 18+ years old", isOver18);
    } else {
      console.log("Verification failed");
    }
  }}
/>;

Verify if the user is between 18 and 25 years old​

Use two bounds, or the range operator (both bounds inclusive). Only the query and result handling change — drop them into the same card as above.

// gte is greater than or equal to, lte is less than or equal to
const query = (queryBuilder) => queryBuilder.gte("age", 18).lte("age", 25).done();
// Alternatively, use the range operator (both bounds inclusive)
// const query = (queryBuilder) => queryBuilder.range("age", 18, 25).done();

const onResult = ({ verified, result }) => {
  if (verified) {
    const isBetween18And25 = result.age.gte.result && result.age.lte.result;
    // const isBetween18And25 = result.age.range.result;
    console.log("User is between 18 and 25 years old", isBetween18And25);
  } else {
    console.log("Verification failed");
  }
};