TSLint marks body-parser as deprecated

Question

I have the Typescript code below:

import * as express from 'express';
import * as bodyParser from 'body-parser';

...
const app: express.Application = express();

app.use(bodyParser.json());

In VSCode the bodyParser on the last line is marked with yellow squiggles saying that body-parser is deprecated.

In the .d.ts file I see the following:

/** @deprecated */
declare function bodyParser(
    options?: bodyParser.OptionsJson & bodyParser.OptionsText & bodyParser.OptionsUrlencoded,
): NextHandleFunction;

declare namespace bodyParser {
...
    function json(options?: OptionsJson): NextHandleFunction;

Why is the linter complaining about the body-parser function while I do not use it as a function in my code? Am I missing something in a tsconfig.json file to prevent this? Compiling doesn't seem to be a problem.

Yes, sorry. I've added some more code lines to make that clear. — Halt
– Halt, Commented Jun 15, 2020 at 20:38
IIRC, Express.js has the function of body-parser built in since V4.16 or something like that. — Kasey Chang
– Kasey Chang, Commented Jun 15, 2020 at 20:39

Thanveer Shah · Accepted Answer · 2020-06-15 20:37:52Z

64

BodyParse is built into Express js

So now you don't have to install body-parser, do this instead.

app.use(express.json());

answered Jun 15, 2020 at 20:37

Thanveer Shah

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3 Comments

Halt Over a year ago

Thank you for that, I had seen this before but didn't pay enough attention because I didn't realise it also meant that I shouldn't use the original body-parser. Still I don't understand the lint warning because the deprecation annotation is only before the function that I'm not using.

Thanveer Shah Over a year ago

You are welcome :) , You could accept the answer so people know its a working solution

AndrogenAgonist Over a year ago

if you are looking for some popcorn eating material: github.com/expressjs/body-parser/issues/428

Abraham · Accepted Answer · 2021-10-17 18:47:47Z

8

Do not use body-parser anymore

Since Express 4.16+ the body parsing functionality has become builtin with express

So, you can simply do

app.use(express.urlencoded({extended: true}));
app.use(express.json()) // To parse the incoming requests with JSON payloads

using express directly, without having to install body-parser.

uninstall body-parser using npm uninstall body-parser

Then you can access the POST data, using req.body

app.post("/yourpath", (req, res)=>{

    var postData = req.body;

    //Or if body comes as string,

    var postData = JSON.parse(req.body);
});

edited Oct 17, 2021 at 18:47

answered Jun 26, 2021 at 22:52

Abraham

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2 Comments

sam Over a year ago

what is app and express values here?

Abraham Over a year ago

@sam It's from the library. const express = require("express"); and const app = express();

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