Fail One GraphQL Operation

GraphQL clients often send every operation to /graphql. Use graphqlOperation to fail one operation without breaking unrelated queries on the same URL.

Playwright

await injectChaos(page, {
  seed: 42,
  network: {
    failures: [{
      urlPattern: '/graphql',
      graphqlOperation: 'GetUser',
      statusCode: 503,
      probability: 1,
    }],
  },
});

await page.goto('/profile');
await expect(page.locator('[data-testid="profile-error"]')).toBeVisible();
await page.getByRole('button', { name: 'Search products' }).click();
await expect(page.locator('[data-testid="products"]')).toBeVisible();

Cypress

cy.injectChaos({
  seed: 42,
  network: {
    failures: [{
      urlPattern: '/graphql',
      graphqlOperation: 'GetUser',
      statusCode: 503,
      probability: 1,
    }],
  },
});

cy.visit('/profile');
cy.get('[data-testid="profile-error"]').should('be.visible');
cy.findByRole('button', { name: 'Search products' }).click();
cy.get('[data-testid="products"]').should('be.visible');

WebdriverIO

await browser.url('/profile');
await injectChaos(browser, {
  seed: 42,
  network: {
    failures: [{
      urlPattern: '/graphql',
      graphqlOperation: 'GetUser',
      statusCode: 503,
      probability: 1,
    }],
  },
});

await $('#reload-profile').click();
await expect($('[data-testid="profile-error"]')).toBeDisplayed();
await $('[data-testid="search-products"]').click();
await expect($('[data-testid="products"]')).toBeDisplayed();

Puppeteer

await injectChaos(page, {
  seed: 42,
  network: {
    failures: [{
      urlPattern: '/graphql',
      graphqlOperation: /^GetUser$/,
      statusCode: 503,
      probability: 1,
    }],
  },
});

await page.goto('http://localhost:3000/profile');
await page.waitForSelector('[data-testid="profile-error"]');
await page.click('[data-testid="search-products"]');
await page.waitForSelector('[data-testid="products"]');

graphqlOperation is an additional matcher. urlPattern and methods still apply, so a rule can target only POST GetUser or only persisted-query GET GetUser when needed.

If a rule with graphqlOperation seems inactive, check the chaos log for a reason: 'graphql-body-unparseable' diagnostic. Multipart, streaming, and XHR Blob bodies cannot be inspected for an operation name and emit this event with applied: false instead of matching.