node.js: console.warn([data][, ...args]): Log warning message

console.warn([data][, ...args])

Prints the message to stderr with new line. Multiple arguments can be passed, with the first used as the primary message and all additional used as substitution values.

HelloWorld.js

console.warn("User '%s' login failed", "Krishna");

Output

User 'Krishna' login failed

If formatting elements (e.g. %s, %d etc.,) are not found in the first string then util.inspect() is called on each argument and the resulting string values are concatenated.

HelloWorld.js

console.warn("User login failed","Krishna","Maximum attempts:",3);

Output

User login failed Krishna Maximum attempts: 3

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