SeleniumHQ/selenium · error · Error

Status must be an integer. Received:'${statusCode}'

Error message

Status must be an integer. Received:'${statusCode}'

What it means

Thrown by `ContinueResponseParameters.statusCode()` when the argument is not an integer (`!Number.isInteger(statusCode)`). This rejects floats, strings, NaN, and booleans; the value must be a whole number. Note `Number.isInteger` is stricter than a truthy/numeric check.

Source

Thrown at javascript/selenium-webdriver/bidi/continueResponseParameters.js:117

   */
  reasonPhrase(reasonPhrase) {
    if (typeof reasonPhrase !== 'string') {
      throw new Error(`Reason phrase must be a string. Received: '${reasonPhrase})'`)
    }
    this.#map.set('reasonPhrase', reasonPhrase)
    return this
  }

  /**
   * Sets the status code for the response.
   *
   * @param {number} statusCode - The status code to set.
   * @returns {ContinueResponseParameters} - The current instance of the ContinueResponseParameters for chaining.
   * @throws {Error} - If the `statusCode` parameter is not an integer.
   */
  statusCode(statusCode) {
    if (!Number.isInteger(statusCode)) {
      throw new Error(`Status must be an integer. Received:'${statusCode}'`)
    }

    this.#map.set('statusCode', statusCode)
    return this
  }

  asMap() {
    return this.#map
  }
}

module.exports = { ContinueResponseParameters }

View on GitHub (pinned to aa36b38e69)

Solutions

1. Pass a plain integer literal like 200, 404, 500
2. If the value arrives as a string, convert with `Number.parseInt(code, 10)` and re-validate with `Number.isInteger` before calling

Example fix

// before
params.statusCode('200')
// after
params.statusCode(200)

if (Number.isInteger(code)) params.statusCode(code)

const isStatusCode = (c) => Number.isInteger(c)

When it happens

Trigger: Calling `params.statusCode('200')` (string), `params.statusCode(200.5)` (float), `params.statusCode(undefined)`, or `params.statusCode(true)`.

Common situations: Status code read as a string from config/headers; floating-point math producing a non-integer; passing a Boolean.

Related errors

• Value must be an instance of BytesValue. Received: '${value}
• CookieHeader must be an instance of Header. Received:'${head
• Header value must be an instance of Header. Received:'${head
• Http method must be a string. Received: '${method})'
• Url must be a string. Received:'${url}'

AI-assisted analysis of SeleniumHQ/selenium@aa36b38e69 (2026-08-14). Data as JSON: /api/errors/10ce277e4d19ee39. Report an issue: GitHub.