CODEWITHSUNDEEP
javascriptnode.jsdate-fns
Rohit Kumar
Rohit Kumar

Reputation: 99

TypeError: format is not a function in date-fns

I am migrating from moment to date-fns and following docs on the official site.

I have installed date-fns from npm and when I try to use I get this error:

TypeError: format is not a function

I have tried import, require but they all give same error.

var format = require('date-fns/format')
import format from 'date-fns/format'

Also the typeof(format) returns undefined.

Using v1.29.0 on Nodejs

Upvotes: 9

Views: 24452

Answers (4)

user2859710
user2859710

Reputation: 31

I imported the format function with aliasing and it solved the issue.

import { format as format_date } from 'date-fns'

Upvotes: 0

Varun Vajpayee
Varun Vajpayee

Reputation: 31

I have managed to fix it by adding "esModuleInterop": true to tsconfig.json.

Upvotes: 3

Jitendra
Jitendra

Reputation: 3185

I followed the same step as you did and it works fine for me.

Most Important: Upgrade your node version to v8.X or above.I am using node v10.8.0. You can follow here to upgrade version.

The library is available as an npm package, a Bower package, and is also distributed through a CDN.

You can use this properly by following give steps:

Step 1: First, you can install the package via running following command. (You might forget to install the package)

npm install date-fns --save

or

yarn add date-fns .

Step 2: It is used to get the formatted date string in the various formats and if you are using ES15 standards then you can import the package by adding following line above to your code.

import format from 'date-fns/format'

Step 3: Syntax for use will be as follow and list of various formats are given in the official doc. you can take reference from here 

format(date, [format='YYYY-MM-DDTHH:mm:ss.SSSZ', [options]])

Step 4: To take better understanding here is the simple example: 

 var result = format(
      new Date(2014, 1, 11),
      'MM/DD/YYYY'
    ) 
console.log('Result: ',result);

Conclusion: I tried all the above steps and I got the following result in console:

Result:  02/11/2014

Alternatively: Try running follow code with REPL.
Step 1: Open your terminal and run the command sudo node

Step 2: Copy and paste below code in your terminal

var format = require('date-fns/format');
var result = format(
    new Date(2014, 1, 11),
    'MM/DD/YYYY'
) 
console.log('Result: ',result);

Step 3: Press enter and you will get Result: 02/11/2014 in your terminal console.

Upvotes: 1

Faheem
Faheem

Reputation: 1166

From the doc.

import { format } from 'date-fns';

Upvotes: 15

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