Sharing tips on using express and fetch to obtain local json files in vue

This article mainly introduces the detailed explanation of using express+fetch to obtain local json files in vue. It is of great practical value. Friends in need can refer to it. I hope it can help everyone.

When I was making a small vue demo, I wanted to simulate the process of obtaining json data from the server. The initial idea was to use fetch to directly obtain the local json file, regardless of whether json-loader was installed Or put the json file in the directory of index.html or the directory of output in webpck.config.js, but fetch keeps reporting that the file cannot be found. Then decide to use fetch to send a request to the express server, and the server will return json data.

express server

First write a simple express server with only one interface, which can be used as an example. back.js is as follows:

var express = require('express') var app = express(); var allowCrossDomain = function(req, res, next) {//设置response头部的中间件 res.header('Access-Control-Allow-Origin', 'http://localhost:8089');//8089是vue项目的端口，这里相对于白名单 res.header('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE'); res.header('Access-Control-Allow-Headers', 'Content-Type'); res.header('Access-Control-Allow-Credentials','true'); next(); }; app.use(allowCrossDomain); app.get("/api/data",function (request,response) { var data = require('./grid.json');//要获取的json文件 response.send(data); }) app.listen('3000',function () { console.log('>listening on 3000') });

Then use the command node back.js to run the service.

fetch to get json data

The server that accepts the request is already running. The next step is to use fetch to send the request. The following code snippet can complete the request function. ：

fetch( "http://localhost:3000/api/data") .then(res=>res.json()) .then(data=>console.log(data)) .catch(function (e) { console.log('oops! error:',e.message) })

Now you can successfully obtain the json data you want

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