Hide fetch/XHR in Cypress command log

README.md

This novel workaround simply hides any command log entries that originate from fetch/XHR requests.

While I've updated this receipe for Cypress 10 and converted it to TypeScript you should be able to use it in a JavaScript project by ignoring the cypress.d.ts file and placing the snippet from e2e.ts in e2e.js instead.

cypress.d.ts

// Add the following to cypress/support/cypress.d.ts
declare namespace Cypress {
  interface ResolvedConfigOptions {
    hideXHRInCommandLog?: boolean;
  }
}

e2e.ts

// Add the following to cypress/support/e2e.ts or cypress/support/e2e.js

// Hide fetch/XHR requests from command log
if (Cypress.config('hideXHRInCommandLog')) {
  const app = window.top;

  if (
    app &&
    !app.document.head.querySelector('[data-hide-command-log-request]')
  ) {
    const style = app.document.createElement('style');
    style.innerHTML =
      '.command-name-request, .command-name-xhr { display: none }';
    style.setAttribute('data-hide-command-log-request', '');

    app.document.head.appendChild(style);
  }
}

Thanks Simen!

Thanks for sharing this! Curious about why do we need if (!app.document.head.querySelector('[data-hide-command-log-request]')) and style.setAttribute('data-hide-command-log-request', '');? Thanks!

@roneyuan Otherwise the snippet would be injected for every test

@simenbrekken Thanks!

We had a similar situation but where we only wanted to hide xhr requests to specific domains so went a slightly different route on the workaround that handles each individual logged message. It's not quite so clean maybe but suited our specific purpose.

Cypress.on("log:added", (ev) => {
  if (ev.displayName === "xhr" && /some-domain/.test(ev.consoleProps.URL)) {
    const el = Array.from(window.top.document.querySelectorAll(".command-wrapper")).slice(-1)[0];
    if (el) {
      el.style.display = "none";
    }
  }
});

This worked for me:

const origLog = Cypress.log
Cypress.log = function (opts, ...other) {
  if (
    opts.displayName === 'fetch' &&
    opts.url.startsWith("https://example.com")
  ) {
    return
  }
  return origLog(opts, ...other)
}

It just works, Thanks for sharing :)

@simenbrekken this throws an error as object is possibly null how do i fix this please

This no longer works since I updated to Cypress 10.0. The support/index.js file was renamed to support/e2e.js , Would that be the reason as to why?

The solution of @cie works nicely in the latest version 10.0.2.

It's also really easy to modify to do even more advanced things, thanks for the tip! Slightly modified if you want to block certain domains:

const cypressLogOriginal = Cypress.log
const cypressLogDomainsHidden = ['fontawesome.com']
Cypress.log = function (opts, ...other) {
	const logFetchIs = ['fetch'].includes(opts.displayName)
	const logFetchDomainMatch = logFetchIs && cypressLogDomainsHidden.find((d) => opts.url.includes(d))
	if (logFetchDomainMatch) return
    
	return cypressLogOriginal(opts, ...other)
}

I haven't had time to update to 10, but @cie appears to be working.

@justjoshn I just updated to 10.2.0 and @simenbrekken's snippet still works for me. If you used the Cypress.config('hideXHR') option there might be a problem with the placement of your hideXHR config value in the newly generated cypress.config.ts file.

Thanks again @simenbrekken for such a useful snippet!

I've now updated this for Cypress 10 with TypeScript: https://gist.github.com/simenbrekken-visma/e804c86fd6a23cc59b89913eabbf1d82

Thanks @simenbrekken, snippet works like a charm (currently in 11.2.0)

Very helpful thread.
I landed on:

/**
 * @see https://gist.github.com/simenbrekken/3d2248f9e50c1143bf9dbe02e67f5399
 */
export function silenceFetchLogs(silenceFetchPattern: RegExp | string): void {
  let loggedOnce: boolean = false;
  const originalCypressLog = Cypress.log
  Cypress.log = function (opts, ...other) {
    if (
      opts.displayName === "fetch"
      &&
      ((opts as any).url as string).match(silenceFetchPattern) != null
    ) {
      if (loggedOnce) {
        return
      } else {
        loggedOnce = true;
        opts.displayName = "noisy fetch - will be silenced";
        return originalCypressLog(opts, ...other)
      }
    }
    return originalCypressLog(opts, ...other)
  }
}

Perfect! Works like a charm.

Thank you!

thanks a lot

A slightly easier way of disabling, using cy.intercept():
in your './cypress/support/e2e' set:

before(function () {
    // disable Cypress's default behavior of logging all XMLHttpRequests and fetches to the Command Log
    cy.intercept({ resourceType: /xhr|fetch/ }, { log: false })
})

Based on this thread I created a cypress plugin to filter logs both with cypress open and cypress run based on log levels.

You can check it out here: https://www.npmjs.com/package/cypress-log-filter

Based on this thread I created a cypress plugin to filter logs both with cypress open and cypress run based on log levels.

You can check it out here: https://www.npmjs.com/package/cypress-log-filter

This library would've been great if didn't permit the log messages' markup to render at all (in my scenario I have many requests coming in, almost never ending, which causes the host OS to run out of memory (which just causes cypress to crash)).

Nevermind comment - Just realized your plugin is for filtering ('live') but not necessarily preventing the markup rendering.

Thanks for sharing!

Based on this thread I created a cypress plugin to filter logs both with cypress open and cypress run based on log levels.
You can check it out here: https://www.npmjs.com/package/cypress-log-filter

This library would've been great if didn't permit the log messages' markup to render at all (in my scenario I have many requests coming in, almost never ending, which causes the host OS to run out of memory (which just causes cypress to crash)).

Nevermind comment - Just realized your plugin is for filtering ('live') but not necessarily preventing the markup rendering.

Thanks for sharing!

Yeah, the thing is that I tried filtering them before they were added in the first place but the logs API doesn't allow you to do that :'(

That's as much as I was able to do

👍 , I hear you - In the end I went with the "shimming the Cypress.log method approach (mentioned by @cie), but more refined (used a regular expression, defined outside of custom method, and just ran a test on incoming log displayName types).