it doesn't work on xxx.js or remote url,though xxx.json is ok

[nillwyc]

it doesn't work on xxx.js or remote url,though xxx.json is ok

does anyone have the same problem as mine?

my Node.js:v18.19.0

this is a .js file in my work folder.

module.exports = () => {
  const data = { users: [] };
  // Create 1000 users
  for (let i = 0; i < 1000; i++) {
    data.users.push({ id: i, name: `user${i}` });
  }
  return data;
};

i tested these codes which copied on https://github.com/typicode/json-server/tree/v0
but something wrong

(base) PS T:\router> json-server --version
1.0.0-alpha.23

(base) PS T:\router> json-server http://jsonplaceholder.typicode.com/db
File http://jsonplaceholder.typicode.com/db not found

(base) PS T:\router> json-server --watch db.js
--watch/-w can be omitted, JSON Server 1+ watches for file changes by default
undefined:1
module.exports = () => {
^

SyntaxError: Unexpected token m in JSON at position 0
    at JSONFile.parse (<anonymous>)
    at JSONFile.read (file:///T:/myDev/env/nvm1.1.10/v18.19.0/node_modules/json-server/node_modules/lowdb/lib/adapters/node/DataFile.js:17:31)
    at async Observer.read (file:///T:/myDev/env/nvm1.1.10/v18.19.0/node_modules/json-server/lib/observer.js:21:22)
    at async Low.read (file:///T:/myDev/env/nvm1.1.10/v18.19.0/node_modules/json-server/node_modules/lowdb/lib/core/Low.js:16:22)
    at async file:///T:/myDev/env/nvm1.1.10/v18.19.0/node_modules/json-server/lib/bin.js:114:1

Node.js v18.19.0

[spanic]

Well, .js files are not supported anymore as a source for database generation, as it comes from

json-server/src/bin.ts

Lines 128 to 136 in 6aa56d9

	let adapter: Adapter<Data>
	if (extname(file) === '.json5') {
	adapter = new DataFile<Data>(file, {
	parse: JSON5.parse,
	stringify: JSON5.stringify,
	})
	} else {
	adapter = new JSONFile<Data>(file)
	}

Obviously, json-server expects only .json5 and .json files, these changes have been made in PR #1468. However you can install latest >= 0.X.X version (0.17.4 as for today), where .js still can be used:

json-server/src/cli/utils/load.js

Lines 48 to 62 in baf0aee

	} else if (is.JS(source)) {
	// Clear cache
	const filename = path.resolve(source)
	delete require.cache[filename]
	const dataFn = require(filename)
	if (typeof dataFn !== 'function') {
	throw new Error(
	'The database is a JavaScript file but the export is not a function.',
	)
	}
	// Run dataFn to generate data
	const data = dataFn()
	resolve(low(new Memory()).setState(data))

Looks like you also want to generate data - I also had the same task, and I solved it by creating.json file with Node.js script and then using this file as a source for json-server: https://gitverse.ru/austin_s/react-interview-task-v3/content/main/server/index.cjs