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const bp = require("body-parser");
const express = require("express");
const app = express();
app.use(bp.json());
app.use(bp.urlencoded({ extended: true }));
I need to know what they do. I couldn't find any detailed information. Can you help me? And what is the difference between extended:true and extended:false
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The extended option allows to choose between parsing the URL-encoded data with the querystring library (when false) or the qs library (when true). The “extended” syntax allows for rich objects and arrays to be encoded into the URL-encoded format, allowing for a JSON-like experience with URL-encoded.
bodyParser. json returns middleware that only parses JSON. This parser accepts any Unicode encoding of the body and supports automatic inflation of gzip and deflate encodings. A new body object containing the parsed data is populated on the request object after the middleware (i.e. req. body ).
bodyParser. text([options]) Returns middleware that parses all bodies as a string and only looks at requests where the Content-Type header matches the type option. This parser supports automatic inflation of gzip and deflate encodings.
json() is a built-in middleware function in Express. This method is used to parse the incoming requests with JSON payloads and is based upon the bodyparser. This method returns the middleware that only parses JSON and only looks at the requests where the content-type header matches the type option.
Body-parser is the Node.js body parsing middleware. It is responsible for parsing the incoming request bodies in a middleware before you handle it. You can visit the link to Install body-parser module.
app.use (bodyParser.json ()) basically tells the system that you want json to be used. bodyParser.urlencoded ({extended:...}) basically tells the system whether you want to use a simple algorithm for shallow parsing (i.e. false) or complex algorithm for deep parsing that can deal with nested objects (i.e. true).
bodyParser.urlencoded ([options]) Returns middleware that only parses urlencoded bodies and only looks at requests where the Content-Type header matches the type option. This parser accepts only UTF-8 encoding of the body and supports automatic inflation of gzip and deflate encodings.
You don't need to use require ("body-parser") in express. Because express from v4 has body-parser implemented. And you can use: app.use (express.json ()) app.use (express.urlencoded ( {extended: true})) It is the same.
body-parser is an NPM package that parses incoming request bodies in a middleware before your handlers, available under the req.body property.
app.use(bp.json()) looks at requests where the Content-Type: application/json header is present and transforms the text-based JSON input into JS-accessible variables under req.body. app.use(bp.urlencoded({extended: true}) does the same for URL-encoded requests. the extended: true precises that the req.body object will contain values of any type instead of just strings.
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Full documentation of body-parser library can be found here.
bp.json() - middleware for parsing json objects - options can be found here. Source code can be found here.
Returns middleware that only parses JSON and only looks at requests where the Content-Type header matches the type option. This parser accepts any Unicode encoding of the body and supports automatic inflation of gzip and deflate encodings.
bp.urlencoded({ extended: true }) - middleware for parsing bodies from URL. Options can be found here. Source code can be found here.
Returns middleware that only parses {urlencoded} bodies and only looks at requests where the Content-Type header matches the type option. This parser accepts only UTF-8 encoding of the body and supports automatic inflation of gzip and deflate encodings.
A new body object containing the parsed data is populated on the request object after the middleware (i.e. req.body). This object will contain key-value pairs, where the value can be a string or array (when extended is false), or any type (when extended is true).
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