JavaScript Console APIs I Always Forget Because They're Rarely Used

console API

Method	Functionality
console.info('<message>', hoge);	Outputs the message and hoge. There are also log, debug, etc.
console.error('<message>');	Outputs the message. Also displays the stack trace.
console.trace();	Displays the stack trace.
console.time('<identifier>');	Measures the time until timeEnd and outputs it at timeEnd.
console.timeLog('<identifier>');	Outputs the intermediate elapsed time.
console.timeEnd('<identifier>');	Same as above. Matches the time call using the identifier.

console.time() and console.timeEnd() are useful for understanding the current state during performance optimization.

Others

Method	Functionality
debugger;	Sets a breakpoint here.

References

• JavaScript to easily measure elapsed time with console - Qiita
• As of April 2019, JavaScript's console has become amazing. - Qiita
• Recommendations for high-speed coding and debugging methodologies in JavaScript and jQuery - Practical reverse lookup (for Windows, Chrome) - Qiita