Cypress - Matching a query with a wildcard or regex

Consider the below code to intercept an API call. It checks if query parameter cliendId = 36. I want to make this code only consider the query param clientId and NOT its value of 36. So, I tried to use "*" instead of '36' and it did not work. I could not find the answer in existing stack overflow questions. How do I make cypress only intercept based on the query param name and not its value ?

cy
  .intercept({
    pathname: '/api/program/v1/program'
    query: {
      clientId: '36'
    }
  })
  .as('createProgram');

You can use path instead of pathname, then include the query in the pathname string with a wildcard.

When fetching first client 36 then client 48, I wait on each one and verify it's clientId, using the same cy.intercept():

cy.intercept({ path: '/todos/1?clientId=*' }).as('client')

...

cy.wait('@client').its('request.query').should('have.property', 'clientId', '36')
cy.wait('@client').its('request.query').should('have.property', 'clientId', '48')

From RouteMatcher options

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More examples

Matching a query key at any position

it('path with wildcard - key in any query position', () => {

  cy.intercept({ path: '/todos/1?*clientId=*' }).as('client')

  cy.then(() => {
    const win = cy.state('window')
    const queryString = 'age=22&clientId=48&countryId=22'
    win.fetch(`https://jsonplaceholder.typicode.com/todos/1?${queryString}`)
  })

  cy.wait('@client').its('request.query').should('have.property', 'clientId', '48')
})

---

Matching two keys out of three in strict order

it('path with regex - matches clientId followed by countryId (in strict order)', () => {
  
  cy.intercept({ path: /\/todos\/1\?(.*clientId=.*)(.*countryId=.*)/ }).as('client')

  cy.then(() => {
    const win = cy.state('window')
    const queryString = 'age=22&clientId=48&countryId=22'
    win.fetch(`https://jsonplaceholder.typicode.com/todos/1?${queryString}`)
  })

  cy.wait('@client').its('request.query')
    .should(query => {
      expect(query).to.have.property('clientId', '48')
      expect(query).to.have.property('countryId', '22')
    })
})

---

Matching two keys out of three in any order

it('path with regex - matches clientId and countryId in any order', () => {
  
  cy.intercept({ path: /\/todos\/1\?(?=.*countryId=.*)(?=.*clientId=.*)/ }).as('client')

  // (?=.*key=.*) is positive lookahead that allows key to be in any order

  cy.then(() => {
    const win = cy.state('window')
    const queryString = 'age=22&clientId=48&countryId=22&gender=male'
    win.fetch(`https://jsonplaceholder.typicode.com/todos/1?${queryString}`)
  })

  cy.wait('@client').its('request.query')
    .should(query => {
      expect(query).to.have.property('clientId', '48')
      expect(query).to.have.property('countryId', '22')
    })
})

I would encourage hands-on experimentation, as it's a great way to improve skills.