Firebase Local Emulator Suite provides a rich user interface that includes support for viewing emulator logs. You can filter logs in the Emulator Suite UI using the query syntax described on this page.
The logs query language supports exact comparisons and and
operations. Other operations are not currently supported.
Quotes are generally optional, except when using spaces or newlines.
Note this query syntax is available in Emulator Suite UI only. Emulators
output additional logs in the *-debug.log files in your project
directory (e.g., firestore-debug.log).
// Find only info logs. level=info //Find logs for the sayHelloWorld function metadata.emulator.name=functions metadata.function.name=sayHelloWorld //Find any log mentioning "hello world" hello world // turns into search="hello world" internally //Return any Hosting POST requests metadata.emulator.name=hosting search=POST
Keywords
level
Log level. One of warn, info, error.
search
Text to match in a fuzzy search. For example, search=abc
returns logs with the text "abc".
Use the search keyword to combine fuzzy searches with other keyword
searches using the and operator.
metadata
Query on a specific emulator or on a function name.
metadata.emulator.name
Query logs from a specified emulator. One of firestore, functions,
database, pubsub, hosting, storage.
metadata.function.name
The function name as defined in user app code.
user
Any JSON data the user logged from in-app code, for example:
console.log(JSON.stringify({hello: world}))
The above log output can be queried with user.hello.