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The Faker library is preloaded in every step that accepts templating, and in JavaScript steps via the faker global.

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Inline via templating

Any string field supports {{ }} expressions: 
Username: {{ faker.internet.username() }}
Email:    {{ faker.internet.username() }}@usemomentic.com
Lorem:    {{ faker.lorem.words() }}
Index:    the {{ faker.number.int(100) }} item in the list

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Persist to the environment

For complex objects or values used across many steps, set them once in a JavaScript step: 
const person = {
  firstName: faker.person.firstName(),
  lastName: faker.person.lastName(),
  email: faker.internet.email(),
};
setVariable("FAKE_PERSON", person);
Then reference in later steps: {{ env.FAKE_PERSON.firstName }}.