is there a require for json in node.js

问题

I would like to include a couple of JSON files in my JavaScript code that are in the same directory as my JavaScript source file.

If I wanted to include another JavaScript file I could simply use require. Now I'm using readFileSync and __dirname to get the JSON, which I think is an ugly way to do it.

Is there something similar for require that enables me to load a JSON file?

回答1:

As of node v0.5.x yes you can require your JSON just as you would require a js file.

var someObject = require('./somefile.json')

In ES6:

import someObject from ('./somefile.json')

回答2:

JSON files don’t require an explicit exports statement. You don't need to export to use it as Javascript files.

So, you can use just require for valid JSON document.

data.json

{
  "name": "Freddie Mercury"
}

main.js

var obj = require('data.json');

console.log(obj.name); 
//Freddie Mercury

回答3:

No. Either use readFile or readFileSync (The latter only at startup time).

Or use an existing library like

cjson

Alternatively write your config in a js file rather then a json file like

module.exports = {
  // json
}

回答4:

Two of the most common

First way :

let jsonData = require('./JsonFile.json')

let jsonData = require('./JsonFile') // if we omitting .json also works

import jsonData from ('./JsonFile.json')

Second way :

1) synchronously

const fs = require('fs')
let jsonData = JSON.parse(fs.readFileSync('JsonFile.json', 'utf-8'))

2) asynchronously

const fs = require('fs')
let jsonData = {}
fs.readFile('JsonFile.json', 'utf-8', (err, data) => {
  if (err) throw err

  jsonData = JSON.parse(data)
})

Note: 1) if we JsonFile.json is changed, we not get the new data, even if we re run require('./JsonFile.json')

2) The fs.readFile or fs.readFileSync will always re read the file, and get changes

回答5:

You even can use require of your JSON without specifying the extension .json. It will let you change the file extension to .js without any changes in your imports.

assuming we have ./myJsonFile.json in the same directory.

const data = require('./myJsonFile')

If in the future you'll change ./myJsonFile.json to ./myJsonFile.js nothing should be changed in the import.

来源：https://stackoverflow.com/questions/7163061/is-there-a-require-for-json-in-node-js

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json

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