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Update log level explanation on README.md to make slightly clearer #2551

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Update log level explanation on README.md to make slightly clearer #2551

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12e966b
update log level explanation on README.md to make slightly clearer
artdedeco Jun 10, 2025
dc7b986
add more code examples in the level filter on the README.md
artdedeco Jun 10, 2025
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15 changes: 10 additions & 5 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -574,10 +574,11 @@ winston.info("127.0.0.1 - there's no place like home");
```

`winston` allows you to define a `level` property on each transport which
specifies the **maximum** level of messages that a transport should log. For
example, using the `syslog` levels you could log only `error` messages to the
console and everything `info` and below to a file (which includes `error`
messages):
specifies the **maximum** level (that is, the minimum severity, as explained
on Logging Levels above) of messages that a transport should log. For
example, using the `npm` levels you could log only `error` messages to the
console and everything `info` and below (which includes `error`
messages, but will exclude eg. http and verbose) to a file :

``` js
const logger = winston.createLogger({
Expand All @@ -590,6 +591,10 @@ const logger = winston.createLogger({
})
]
});

logger.debug('Will not be logged in either transport!');
logger.info('Will be logged only in File!');
logger.error('Will be logged by both transports!');
```

You may also dynamically change the log level of a transport:
Expand Down Expand Up @@ -1268,4 +1273,4 @@ npm test
[Charlie Robbins]: http://github.com/indexzero
[Jarrett Cruger]: https://github.com/jcrugzz
[David Hyde]: https://github.com/dabh
[Chris Alderson]: https://github.com/chrisalderson
[Chris Alderson]: https://github.com/chrisalderson