Heartsuit's Simple Blog
A place to hold mainly reading notes, and some technical stuff occasionally. 这里主要是一些读书笔记、感悟；还有部分技术相关的内容。
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Node读写JSON
发布：2017-08-04 Friday
标签：Node.js
目录[-]
Node读写JSON
- 使用require读取JSON；
- 使用fs.writeFile异步写入JSON；
JSON.stringify(jsonObj, null, 2);后面两个参数仅为了目标文件内容格式相对美观一些；
- 使用fs.readFileSync同步读取JSON；
JSON 文件内容
{ "books": [
{"name":"秒速五厘米","author":"新海诚","nationality":"日","date":"2017-1-13"},
{"name":"一句顶一万句","author":"刘震云","nationality":"中","date":"2017-3-21"},
{"name":"人类简史","author":"尤瓦尔·赫拉利","nationality":"以","date":"2017-5-17"},
{"name":"Node.js in Action","author":"Mike Cantelon, Marc Harter","nationality":"美","date":"2017-5-31"},
{"name":"茶花女","author":"亚历山大·小仲马","nationality":"法","date":"2017-7-8"}
]
}
Node 读取、写入
const fs = require('fs');
let jsonFile = './books.json';
// read from json, method1: use require
let jsonObj = require(jsonFile);
console.log(jsonObj);
// add a new one
let book = { "name": "无人生还", "author": "阿加莎·克里斯蒂", "nationality": "英", "date": "2017-7-23" };
jsonObj.books.push(book);
// write to json: use fs.writeFile
fs.writeFile(jsonFile, JSON.stringify(jsonObj, null, 2), (err) => {
if (err) {
console.log(err);
} else {
console.log("JSON saved to " + jsonFile);
// read from json, method2: use fs.readFileSync
let jsonObj = JSON.parse(fs.readFileSync(jsonFile));
console.log(jsonObj);
}
});
If you have any questions or any bugs are found, please feel free to contact me.
Your comments and suggestions are welcome!
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