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The Call Stack defined on MDN

• calling a function adds it to the stack
• functions called by that function are added on top, and all are done in the order of the stack

Understanding the JavaScript Call Stack

• JS is single thread and single stack with LIFO (last in first out)
• error messages show the 'stack trace' from top to bottom so what's on the bottom is the oldest item
• stack overflow is when too many functions are in a stack, typically caused by a recursive loop

JavaScript error messages

• Unexpected token o in JSON at position 1 means a syntax error in json (like wrong quotes)
• debugger can make breakpoints or show the current state of variables during execution for better debugging

Reference

JavaScript errors reference on MDN