How to append JSON data to existing JSON file node.js
问题 How to append an existing JSON file with comma "," as separator anchors = [ { "title":" 2.0 Wireless " } ] fs.appendFileSync('testOutput.json', JSON.stringify(anchors)); This current code's output is like this [ { "title":" 2.0 Wireless " } ] [ { "title":" Marshall Major II " } ] How to I get this in the correct format with comma "," as separator I want to get something like this [ { "title":" 2.0 Wireless " }, { "title":" Marshall Major II " } ] 回答1: Try this. Don't forget to define anchors