将JSON转换成CSV文件：json2csv
json2csv能够将JSON格式的数据转换成带标题的CSV格式文件。
特性：
- Uses proper line endings on various operating systems
- Handles double quotes
- Allows custom column selection
- Reads column selection from file
- Pretty writing to stdout
- Supports optional custom delimiters
- Not create CSV column title by passing hasCSVColumnTitle: false, into params.
- If field is not exist in object then the field value in CSV will be empty.
示例代码：
var json2csv = require('json2csv'); var json = [ { "car": "Audi", "price": 40000, "color": "blue" }, { "car": "BMW", "price": 35000, "color": "black" }, { "car": "Porsche", "price": 60000, "color": "green" } ]; json2csv({data: json, fields: ['car', 'price', 'color']}, function(err, csv) { if (err) console.log(err); fs.writeFile('file.csv', csv, function(err) { if (err) throw err; console.log('file saved'); }); }); 
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