My React App communicates with a backend service using an API endpoint as follows:
const API_URL = process.env.REACT_APP_API_URL;
const response = await fetch(`${API_URL}/data`);
The environment variable REACT_APP_API_URL is saved in a .env file which looks like this:
REACT_APP_API_URL="http://1.2.3.4:8000"
When I serve the app using npm start everything works fine and the developer console shows that the call was made to the right URL:
Request URL: http://1.2.3.4:8000/data
I received the data as expected as well. But when I run npm run build and then serve the app with serve -s build/ -l 3000 the app fails to fetch because the request goes to the following URL:
Request URL: http://localhost:3000/1.2.3.4:8000/
What am I missing for this to happen?
So the problem was not with my React App or the environment variables but with the way I was serving the app
The listening argument -l in the serve command is the culprit. It should be -p for the port to host on
So the right command is
serve -s build/ -p 3000
Related
I have an angular app generated like this ng new hello-world . This hello-world app listens to a file that is present in some directory and compiles it and generates a form in the UI. Now I want to make this app a library such that I can use this library in my node application/backend/just call it in my cli by specifying the args to serve the UI.
I want to use something like this hello-world --port 4200 --path ./tmpDir/filename.sol so the app serves in port 4200.
So,
I am using NUXT
I am deploying to google cloud run
I am using dotenv package with a .env file on development and it works fine.
I use the command process.env.VARIABLE_NAME within my dev server on Nuxt and it works great, I make sure that the .env is in git ignore so that it doesnt get uploaded.
However, I then deploy my application using the google cloud run... I make sure I go to the Enviroments tab and add in exactly the same variables that are within the .env file.
However, the variables are coming back as "UNDEFINED".
I have tried all sorts of ways of fixing this, but the only way I can is to upload my .env with the project - which I do not wish to do as NUXT exposes this file in the client side js.
Anyone come across this issue and know how to sort it out?
DOCKERFILE:
# base node image
FROM node:10
WORKDIR /user/src/app
ENV PORT 8080
ENV HOST 0.0.0.0
COPY package*.json ./
RUN npm install
# Copy local nuxt code to the container
COPY . .
# Build production app
RUN npm run build
# Start the service
CMD npm start
Kind Regards,
Josh
Finally I found a solution.
I was using Nuxt v1.11.x
From version equal to or greater than 1.13, Nuxt comes with Runtime Configurations, and this is what you need.
in your nuxt.config.js:
export default {
publicRuntimeConfig: {
BASE_URL: 'some'
},
privateRuntimeConfig: {
TOKEN: 'some'
}
}
then, you can access like:
this.$config.BASE_URL || context.$config.TOKEN
More details here
To insert value to the environment variables is not required to do it in the Dockerfile. You can do it through the command line at the deployment time.
For example here is the Dockerfile that I used.
FROM node:10
WORKDIR /app
COPY package*.json ./
RUN npm install
COPY . .
CMD ["npm","start"]
this is the app.js file
const express = require('express')
const app = express()
const port = 8080
app.get('/',(req,res) => {
const envtest = process.env.ENV_TEST;
res.json({message: 'Hello world',
envtest});
});
app.listen(port, () => console.log(`Example app listening on port ${port}`))
To deploy use a script like this:
gcloud run deploy [SERVICE] --image gcr.io/[PROJECT-ID]/[IMAGE] --update-env-vars ENV_TEST=TESTVARIABLE
And the output will be like the following:
{"message":"Hello world","envtest":"TESTVARIABLE"}
You can check more detail on the official documentation:
https://cloud.google.com/run/docs/configuring/environment-variables#command-line
I have built a single-page weather app with React and Node.js but can't seem to get it to deploy to Heroku. So far, I have:
Created a new app on Heroku called weather-app-react-node
Logged into Heroku on the CLI
Run the command 'heroku git:remote -a weather-app-react-node' in my terminal
Added a Procfile with 'web: npm start' in it
Ran 'git add .', 'git commit -m "Pushed to heroku"', 'git push heroku master'
My terminal tells me it is deployed and waiting but when I click on the link, I get this error message:
SecurityError: Failed to construct 'WebSocket': An insecure WebSocket connection may not be initiated from a page loaded over HTTPS.
I've tried to google it but can't seem to find anything relevant to my situation. Anyone know how to fix it?
heroku-site: https://weather-app-react-node.herokuapp.com/github: https://github.com/caseycling/weather-app
To deploy the React app to Heroku, I performed the following steps...
1. In your terminal, enter npm -v and node -v to get your npm and node version. In my case, my npm version is 6.14.1 & my node version is 12.13.0.
2. In package.json, add "main": "server.js", and "engines": { "npm": "6.14.1", "node": "12.13.0" }, under the "private" property. In your scripts property, add "heroku-postbuild": "npm install" and set "start" to "node server.js".
3. In the root directory, create a Procfile with one line of text: web: node server.js.
4. In the root directory, create the server.js file with the below code..
const express = require("express");
// eslint-disable-next-line no-unused-vars
// const bodyParser = require('body-parser');
const path = require("path");
const app = express();
const port = process.env.PORT || 8080;
app.use(express.static(path.join(__dirname, "build")));
// This route serves the React app
app.get('/', (req, res) => res.sendFile(path.resolve(__dirname, "build", "index.html")));
app.listen(port, () => console.log(`Server listening on port ${port}`));
5. Enter npm run build in the terminal to produce the build directory. Next, remove (or comment out) /build from .gitignore file (in root directory).
6. Test if server.js works by entering node server.js (or nodemon server.js) in the terminal. If it works, server.js should serve the React app.
7. Commit everything from step 1-6 to GitHub and Heroku repository. To commit to Heroku repository, in your terminal, enter heroku git:remote -a weather-app-react-node and afterward, enter git push heroku master.
You can try logging in to heroku directly and deploy your github repository's desired branch from there directly.
I used create-react-app-buildpack
npm install -g create-react-app
create-react-app my-app
cd my-app
git init
heroku create -b https://github.com/mars/create-react-app-buildpack.git
or
heroku create -b mars/create-react-app
git add .
git commit -m "I am the newborn app"
git push heroku master
heroku open
Note: In my case, buildpack config from CLI did not work, I still had nodejs-build pack, so I manually changed the build pack to mars/create-react-app in the Heroku project dashboard
The best practice to push React apps to Heroku with a node js backend is to use the Heroku Post Build Script, The post build will take care of all the work under the hood
Follow the steps below
Add This below snippet to your package.json under the scripts
scripts{
"heroku-postbuild": "NPM_CONFIG_PRODUCTION=false npm install --prefix reactFolderName && npm run build --prefix reactFolderName"
}
And add this snippet to your index.js file
app = express()
app.use(express.static('reactFolderName/build'));
app.get('*', (req, res) => res.sendFile(path.resolve(__dirname, 'reactFolderName', 'build', 'index.html')));
After I set up the all the things above mentioned I'm facing this issue.
When I'm using the URL like http://localhost:8080/ & http://localhost:8080/button
Cannot GET /button
In Console
Failed to load resource: the server responded with a status
of 404 (Not Found)
DevTools failed to load source map: Could not load content
for chrome-
extension://gighmmpiobklfepjocnamgkkbiglidom/browser-
polyfill.js.map: System error: net::ERR_FILE_NOT_FOUND
I am building a SPA in Angular 8. I have a multi-stage Docker image that runs ng build to build the distribution and then a simple express server is used to serve the application. (Note: The backend API is on an entirely separate express server.)
Requirements
I need to setup a login page "outside" of the SPA. The login page must be displayed if the user is not authenticated, that way the SPA is not bootstrapped until the authentication is successful (by checking a bearer token in the authorization header).
Questions
Do I need a separate Angular installation to load the login page separate from the rest of the app? Or, should I just skip Angular for the login page and build a simple express page with Pug that sends a POST to the API for authentication?
Note: I am seeking general advice on how to proceed and any examples would be very helpful as well.
Dockerfile
### Dev, QA, and Production Docker servers ###
### Stage 1: Build ###
# Base image
FROM node:12 as builder
# Set working directory
RUN mkdir -p /home/angular/app
WORKDIR /home/angular/app
# Add `/home/angular/app/node_modules/.bin` to $PATH
ENV PATH /home/angular/app/node_modules/.bin:$PATH
# Install and cache app dependencies
COPY angular/package.json /home/angular/app/package.json
RUN npm install -g #angular/cli#8 \
&& npm install
# Add app
COPY ./angular /home/angular/app
# Generate build
RUN ng build --output-path=dist
### Stage 2: Server ###
FROM node:12
USER node
# Create working directory
RUN mkdir /home/node/app
## From 'builder' stage copy over the artifacts in dist folder
COPY --from=builder --chown=node /home/angular/app/dist /home/node/app/dist
# Copy Express server code to container
COPY --chown=node ./express /home/node/app
WORKDIR /home/node/app
RUN npm install
# Expose ports
EXPOSE 4201
CMD ["npm", "start"]
Express server for Angular SPA
This server is run when the Dockerfile executes its command CMD ["npm", "start"]
const express = require('express');
const http = require('http');
const app = express();
// Set name of directory where angular distribution files are stored
const dist = 'dist';
// Set port
const port = process.env.PORT || 4201;
// Serve static assets
app.get('*.*', express.static(dist, { maxAge: '1y' }));
// Serve application paths
app.all('*', function (req, res) {
res.status(200).sendFile(`/`, { root: dist });
});
// Create server to listen for connections
const server = http.createServer(app);
server.listen(port, () => console.log("Node Express server for " + app.name + " listening on port " + port));
Angular supports multiple applications under same project. You can create separate login application using following command:
ng generate application <you-login-app-name-here>
This way you can keep only login related code in '' and other code in you main app. You can build, test or run this new app separate using following commands:
ng build <you-login-app-name-here>
ng test <you-login-app-name-here>
ng serve <you-login-app-name-here>
Angular will generate the build output in /dist/ folder which can be mapped to express route to serve file.
thanks for taking time to help me
im deploying a nodejs express js project
these are the steps that i have done:
1- change the port to: process.env.PORT
code:
const PORT = process.env.PORT || 9000;
app.listen(PORT , function() {
console.log('Application is listening on 9000');
});
2- create Procfile with: web: node server.js
3- make sure in package json the npm start command points to "node path/server.js"
the server works locally
4- important note: I am sending an AJAX request from my front end to the server to get data
I have read on you documentation that i should add 0.0.0.0
$.ajax({
url: "0.0.0.0/hotels",
cache: false,
type: 'GET',
success: function(result) {
bla bla ....
}
});
also i have tried to add the url of heroku the one i get after creating
thanks in advance
have a great day
did not solve it yet but i organized some helpful heroku commands
useful commands
git remote -v
git remote rm heroku
heroku create
git push heroku master
heroku ps:scale web=1
heroku open
heroku logs --tail
heroku run bash
Your code there looks fine (except 0.0.0.0 -- just use a relative path like /). I would ensure you've actually pushed the changes you have there. If you run heroku run bash, do you see your Procfile? When you run node server.js in that environment, does it run successfully?
I've seen Heroku customers get stuck on an issue like this, when the reality is that the code they have locally wasn't properly sent to Heroku.
Hello #jmccartie thank you for replying but it still does not work
could it be the static __dirname? im starting to question every part of the code :D
I changed the path and just to make sure i understood correctly
it used to be : "http://localhost:9000/data/hotels"
now is: "/data/hotels"
would you mind taking a look at my code?
just double check the parts i mentioned
https://github.com/hibaAkroush/herokuNode
i will name the files to make it easier for you
1- Procfile in the root
2- server in server/index.js line 24
3- the front end (where im sending an ajax get request) client/home.js line 6
4- packagejson line 10: "start": "node server/index.js"
thanks
ok i fixed it ...
wohoo!
not sure which thing i made fixed it
but what i did was:
1- I moved the server to the root and of course changed the code a bit so it would still work than i tested it locally to make sure
2- pushed on github
3- added ./ to procfile so it became
web: node ./index.js
instead of web: node index.js
thanks everyone !