How to use koa-based json files

This article introduces the knowledge of "how to use koa-based json files". Many people will encounter this dilemma in the operation of actual cases, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Want to use nodejs (koa) to build a complete front and back end, complete the addition, deletion, modification and query of data, and do not want to use the database, then use the json file. Add, delete, modify and check json files based on koa.

Json code preparation

ConstKoa=require ('koa')

ConstbodyParser=require ('koa-bodyparser')

ConstRouter=require ('koa-router')

Constfs=require ('fs')

Constpath=require ('path')

Constapp=newKoa ()

Constrouter=newRouter ()

App.use (bodyParser ())

/ / routing

Constdeploy=newRouter ()

/ / add, delete, modify and query APIs, which can be added below

/ / load all child routes

Router.use ('/ deploy',deploy.routes (), deploy.allowedMethods ())

App.use (router.routes ()) .use (router.allowedMethods ())

App.listen (3000)

Applicable example of json

[

{"id": 1, "name": "Tang Monk"}

{"id": 2, "name": "Sun WuKong"}

{"id": 3, "name": "Zhu Bajie"}

{"id": 4, "name": "Sha Wujing"}

]

Add and modify

Additions and modifications can be separated, but they are merged to save code.

Deploy.post ('/ add-modify',async (ctx) = > {

/ / the bodyParser used here is used to parse the data sent from the post request. Id is used to find the previous data and modify it. The id of the new data should be set to empty in the foreground.

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