javascript - How to update a fixture file in Cypress - Stack Overflow

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I have a fixture file in cypress which has json data within it

I want to be able to update the fields in this fixture file when I run the test script

For example the fixture file would read

 {
  table: [
    {
      name: 'Joe',
      number: 1,
    },
    {
      name: 'Bob',
      number: 2,
    },
  ],
};

And I want to update the number fields to 3 and 4

I have tried

cy.fixture('dataFile.json')
  .as('data')
  .then((data) => {
    data.table[0].number = 3;
    data.table[1].number = 4;
  });

but it is not working when I run the test i am still seeing everything behave as if the number fields are still 1 and 2. If I print the fields to the console i can see they are actually updated but cypress is still running with the original data

I am still new to both cypress and javascript. How can I get around this?

I have a fixture file in cypress which has json data within it

I want to be able to update the fields in this fixture file when I run the test script

For example the fixture file would read

 {
  table: [
    {
      name: 'Joe',
      number: 1,
    },
    {
      name: 'Bob',
      number: 2,
    },
  ],
};

And I want to update the number fields to 3 and 4

I have tried

cy.fixture('dataFile.json')
  .as('data')
  .then((data) => {
    data.table[0].number = 3;
    data.table[1].number = 4;
  });

but it is not working when I run the test i am still seeing everything behave as if the number fields are still 1 and 2. If I print the fields to the console i can see they are actually updated but cypress is still running with the original data

I am still new to both cypress and javascript. How can I get around this?

• javascript
• cypress

Share Improve this question Follow edited Nov 26, 2020 at 6:41 Joshua 3,16633 gold badges2626 silver badges4040 bronze badges asked Nov 25, 2020 at 20:37 user60982user60982 12311 gold badge11 silver badge22 bronze badges

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4 Answers 4

Sorted by: Reset to default 10

The fixture can be read at the top of the spec file and modified for all tests in the spec.

This way you avoid unexpected problems when using the fixture in another spec

const data = require('cypress/fixtures/dataFile.json')

data.table[0].number = 3
data.table[1].number = 4

it('tests with altered fixture', () => {
  ...
})

Modify fixture data before using it.

cy.fixture('user').then((user) => {
  user.firstName = 'Jane'
  cy.intercept('GET', '/users/1', user).as('getUser')
})

cy.visit('/users')
cy.wait('@getUser').then(({ request }) => {
  expect(request.body.firstName).to.eq('Jane')
})

From: https://docs.cypress.io/api/commands/fixture#Modifying-fixture-data-before-using-it

You have to use both cy.readFile() and cy.writeFile() to achieve this. You can write something like:

cy.readFile("cypress/fixtures/dataFile.json", (err, data) => {
    if (err) {
        return console.error(err);
    };
}).then((data) => {
    data.table[0].number = 3
    data.table[1].number = 4
    cy.writeFile("cypress/fixtures/dataFile.json", JSON.stringify(data))
})

Below code is working for me while updating existing .JSON value.

cy.readFile("cypress/fixtures/credentials.json").then((data) => {  
      data.Username = '[email protected]'
      data.Password = 'test@123'
      cy.writeFile("cypress/fixtures/credentials.json", JSON.stringify(data))
})

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