FormattersLesson 5Free preview

JSON Stringify

This lesson is part of Web Developer Tools · All levels

Summary

JSON.stringify is a JavaScript function that converts values such as an object or array into JSON strings. This function is used when sending data to a server, storing it in localStorage, or recording log. The second parameter can be a substitution to select a property, while the third parameter regulates the indentation. The values undefined and function do not go into output, and circular references will cause error.

Key points

Convert JavaScript values to JSON strings that can be sent or stored
The second parameter (replacer) filters the property or changes the value
The third parameter (space) regulates the output indentation
Properties with value undefined or function are removed from the object
Circular reference causes TypeError

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