I get 'File import callback not supported' when I try to compile my simple solidity contract, that imports ERC721. Can anybody help?

Here is what I have already done:

I have installed openzeppelin in my project folder:

install openzeppelin

This is the solidity contract:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";

contract Mycoin is ERC721 {
    constructor() ERC721("MyCoin", "MYCO") {} 

This is my compile script:

const path = require("path");
const fs = require("fs-extra");
const solc = require("solc");

const buildPath = path.resolve(__dirname, 'build');

const coinPath = path.resolve(__dirname, "contracts", "mycoin.sol");
const src = fs.readFileSync(coinPath, 'utf8');

const input = {
  language: "Solidity",
  sources: {
    "mycoin.sol": {
      content: src,
  settings: {
    outputSelection: {
      "*": {
        "*": ["*"],

const output = JSON.parse(solc.compile(JSON.stringify(input)));


for (let contract in output.contracts["mycoin.sol"]) {
    path.resolve(buildPath, contract + ".json"),

I'm using VSC, and the editor indicates that it can see the openzeppelin file. But apparently the compiler can not find the openzeppelin file. Because I get an error (file import callback not supported) when I run the compile script:

file import callback not supported

I would like to make this project without Truffle/Hardhat, if it is possible.


1 Answer 1


Take a Look at @Julissa DC answer.

Alternate Solution -

Instead of importing Openzeppelin from package. You can directly paste code from github and import it.

Your code will look like

pragma solidity ^0.8.0;

import "./ERC721.sol";
import "./IERC721Receiver.sol";
import "./IERC721Metadata.sol";
import "./Address.sol";
import "./Context.sol";
import "./Strings.sol";
import "./ERC165.sol";

contract Mycoin is ERC721 {
    constructor() ERC721("MyCoin", "MYCO") {} 

And Your Root Directory should look like

├── Mycoin.sol
├── ERC721.sol
├── IERC721Receiver.sol
├── IERC721Metadata.sol
├── Address.sol
├── Context.sol
├── Strings.sol
├── ERC165.sol
├── IERC165.sol

Include all above files in you project in root directory, or in any directory you are confortable with. Like wise edit import path of files.

NOTE - Change import statements in Files according to path
i.e. import "./extensions/IERC721Metadata.sol"; to import "./IERC721Metadata.sol";

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