Listen for the page’s console event and call msg.type() on the ConsoleMessage Puppeteer passes to the handler. It returns the message category as a string, such as error, warn, or log.
Read a console message’s type
page.on('console', msg => {
console.log(msg.type());
});Puppeteer emits a ConsoleMessage through the page’s console event. Use that event-provided object; the ConsoleMessage class reference marks its constructor as internal, so application code should not create these objects directly.
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To branch on a category, compare the return value with a supported type string:
page.on('console', msg => {
const type = msg.type();
const text = msg.text();
if (type === 'error') {
console.error('Page console error:', text);
}
});This reports browser-page console messages. It does not, by itself, capture every kind of page failure, such as failed network requests; those require their corresponding Puppeteer events.
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What values can type() return?
The Puppeteer ConsoleMessageType reference, labeled version 25.3.0, documents these strings:
log,debug,info,warn,error,verbosedir,dirxml,table,trace,clear,assertstartGroup,startGroupCollapsed,endGroupprofile,profileEnd,count,timeEnd
For portability, check the type reference that matches the Puppeteer version installed in your project. The documented union is versioned API surface; do not assume another release has exactly the same list.
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Choose the right inspection method
type() answers what category Puppeteer assigned. Other methods on the same event object expose different information, as listed in the class reference:
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For example, log the category and text together when you need readable diagnostic output. Inspect arguments or source context when the rendered text alone is insufficient.
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Troubleshoot common mistakes
- Getting message text instead of its category: call
msg.type();msg.text()is for the rendered message. - Listening on the wrong event: register a
consolelistener on the Puppeteerpageto receiveConsoleMessageobjects. - Only handling three familiar values: the documented type union includes additional categories such as
table,assert, andverbose. - Constructing a message in application code: use the object Puppeteer emits; its constructor is documented as internal.
- A type comparison does not match: compare the returned string with the documented literal, including capitalization, and confirm the type list for your installed Puppeteer version.
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