What is the solution to the problem of "Failed to execute 'json' on 'Response': body stream already read"?

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Encountered Issue: Error in processing JSON data in the Response: body stream already read

The error mentioned above is a result of issues within your application's code, not due to Cypress. It occurred due to an unhandled promise rejection.

Error encountered: Failed to execute 'json' on 'Response': body stream already read

Cypress will fail the current test automatically upon detecting uncaught errors from your application.

You have the option to configure this behavior and disable it by monitoring the uncaught:exception event

javascriptjsonautomationcucumbercypress

Answer №1

If you encounter an error message stating uncaught errors originating from your application, it indicates that the app itself has thrown an error without handling it properly.

This issue is not caused by the test itself, but you can instruct Cypress to ignore this problem by using the following code snippet available at this link:

Cypress.on('uncaught:exception', (err, runnable) => {
  if (err.message.includes("Failed to execute 'json' on 'Response")) {
    return false
  }
})

(It's recommended to place this code at the beginning of your spec file, preferably before cy.visit().)

However, in your particular scenario, the error occurs because the Response: json() static method is being misused.

The json() method of the Response interface reads a Response stream and completes its reading process.

The error message informs you that the response stream has already been read and likely converted to JSON format. To resolve this issue, simply remove the .json() static method from your code.

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