Category: JavaScript

Sometimes, we want to toggle between multiple .env files like .env.development with Node.js.

In this article, we’ll look at how to toggle between multiple .env files like .env.development with Node.js.

How to toggle between multiple .env files like .env.development with Node.js?

To toggle between multiple .env files like .env.development with Node.js, we can use the dotenv package.

To install it, we run

npm i dotenv

Then we use it by writing

require("dotenv").config({ path: `.env.${process.env.NODE_ENV}` });

to require the dotenv module.

Then we call config with an object with the path set to the path of the config file we want to use.

Conclusion

To toggle between multiple .env files like .env.development with Node.js, we can use the dotenv package.

Sometimes, we want to write to a CSV in Node.js.

In this article, we’ll look at how to write to a CSV in Node.js.

How to write to a CSV in Node.js?

To write to a CSV in Node.js, we can use the fs.writeFile method,.

For instance, we write

const fs = require("fs");
const dataToWrite = "...";

fs.writeFile("./form-tracking/formList.csv", dataToWrite, "utf8", (err) => {
  if (err) {
    console.log("error");
  } else {
    console.log("saved!");
  }
});

to call fs.writeFile with the file path to write to.

dataToWrite has our CSV string that we want to write to the file path.

Then callback is called when the write operation is done or failed.

err in the callback has the error.

Conclusion

To write to a CSV in Node.js, we can use the fs.writeFile method,.

Sometimes, we want to fix ‘Cannot find module’ error for a Node.js app running in a Docker compose environment.

In this article, we’ll look at how to fix ‘Cannot find module’ error for a Node.js app running in a Docker compose environment.

How to fix ‘Cannot find module’ error for a Node.js app running in a Docker compose environment?

To fix ‘Cannot find module’ error for a Node.js app running in a Docker compose environment, we need to install our app’s dependency in the container.

To do this, we write

FROM node:boron

# Create app directory
RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app

# Install app dependencies
COPY package.json /usr/src/app/
RUN npm install

# Bundle app source
COPY . /usr/src/app

EXPOSE 8080
CMD [ "npm", "start" ]

in our Dockerfile for creating our app’s container.

We copy package.json to our container with COPY package.json /usr/src/app/.

And we install the packages with RUN npm install.

Conclusion

To fix ‘Cannot find module’ error for a Node.js app running in a Docker compose environment, we need to install our app’s dependency in the container.

Sometimes, we want to convert string into UTF-8 with Node.js.

In this article, we’ll look at how to convert string into UTF-8 with Node.js.

How to convert string into UTF-8 with Node.js?

To convert string into UTF-8 with Node.js, we call the Buffer.from method.

For instance, we write

const someEncodedString = Buffer.from("foobar", "utf-8").toString();

to call Buffer.from with our buffer string and the string with the encoding of the buffer string.

Then we call toString to return the buffer converted to a string with the "utf-8" encoding.

Conclusion

To convert string into UTF-8 with Node.js, we call the Buffer.from method.