Node.js -liquibase is not a function

Question

I am trying to connect my database in Node.js but I am getting the error liquibase is not a function . I did install the module using npm install liquibase . Why am I getting this error?

const liquibase = require('liquibase');

liquibase({
  changeLogFile: 'resources/liquibase/db.changelog.xml',
  url: 'jdbc:postgresql://localhost:5432/postgres',
  username: 'postgres',
  password: 'admin'
})
.run('<action>', '<action-params>')
.then(() => console.log('success'))
.catch((err) => console.log('fail', err));

New error

Error: Cannot find module 'node-liquibase'
Require stack:
- C:\Users\fabio\OneDrive\Ambiente de Trabalho\LiquibaseNode\index.js
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:880:15)
    at Function.Module._load (internal/modules/cjs/loader.js:725:27)
    at Module.require (internal/modules/cjs/loader.js:952:19)
    at require (internal/modules/cjs/helpers.js:88:18)
    at Object.<anonymous> (C:\Users\fabio\OneDrive\Ambiente de Trabalho\LiquibaseNode\index.js:1:19)
    at Module._compile (internal/modules/cjs/loader.js:1063:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
    at Module.load (internal/modules/cjs/loader.js:928:32)
    at Function.Module._load (internal/modules/cjs/loader.js:769:14)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:72:12) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [
    'C:\\Users\\fabio\\OneDrive\\Ambiente de Trabalho\\LiquibaseNode\\index.js'
  ]
}

Answer 1

Here's a link to the docs for Node errors.

MODULE_NOT_FOUND

A module file could not be resolved while attempting a require() or import operation.

My guess is that node-liquibase is not installed in your application's node_modules directory, and/or is not installed globally on your host machine.

---

Other commenters have already caught some of the issues I was going to mention, and I would also encourage taking a look at the documentation for using it in JavaScript files . There were a few bugs in your original post that are resolved by making sure you're importing the right package and using it correctly.

If you're still having issues, here are the steps I would take if I were in your position:

• Verify that there is a node_modules directory in the root of my Node application
• Verify that node_modules/liquibase also exists in the root of my Node application
• Verify that whatever instance of Node I'm invoking is 'where' I expect it to be (ie "Am I invoking the 'right' application?")

Here's an example of the tree structure for the Node Liquibase Sandbox example repo . This will show what a working node-liquibase consuming project could look like:

.
├── README.md
├── assets
│   └── img
├── changelog.xml
├── db-start-up.sh
├── index.ts
├── node_modules
│   ├── @types
│   ├── liquibase
│   ├── tslib
│   └── typescript
├── package.json
├── testing.js
├── tsconfig.esm.json
├── tsconfig.json
└── yarn.lock

In this example there's package.json file that defines all of the metadata about your Node application, and as a direct 'sibling' there's a node_modules directory that has this application's installed version of node-liquibase .

---

TLDR; Basically your app is asking for node-liquibase but Node can't find it.