How to read JSON file from cypress project?

In Cypress, reading JSON files is a straightforward process, typically used for configuration data or static test data. Below are the detailed steps along with a practical example:

Steps

1. Place the JSON file in the appropriate directory:
   Typically, JSON files should be placed in the cypress/fixtures directory. This is Cypress's default location for storing test data files.

2. Use the cy.fixture() method to read JSON files:
   Cypress provides the cy.fixture() method specifically for loading files located in the fixtures directory.

3. Use this data within your tests:
   The JSON data read can be used anywhere in the test script, such as as input data for the test.

Example

Suppose we have a file named userData.json located in the cypress/fixtures directory, with the following content:

json
{
  "username": "testuser",
  "password": "testpassword"
}

We can read and use this file in a Cypress test like this:

javascript
describe('Login Test', () => {
  it('should login using credentials from JSON file', () => {
    // Read the JSON file
    cy.fixture('userData').then((user) => {
      // user now contains the content of userData.json
      cy.visit('/login') // Visit the login page

      // Use the data from userData.json to fill the login form
      cy.get('#username').type(user.username)
      cy.get('#password').type(user.password)
      cy.get('#login-button').click()

      // Verify successful login
      cy.url().should('include', '/dashboard')
    })
  })
})

This test script first reads the data from userData.json, then uses it to fill the login form and submit. Finally, it verifies a successful navigation to the dashboard page.

Through this approach, we can separate test data from test scripts, making maintenance and management more convenient, and tests more flexible and configurable.