I'm trying to use the Sanford encryption library(sjcl) in my Express App.
I've tried to the following in my app.js file:
var sjcl = require('.lib/sjcl.js');
Next I try to call sjcl.encrypt in my routes/journal.js file, but get an error that it's not defined.
Next I tried requiring the the library in my journal.js file at the beginning, but get the module ./lib/sjcl.js cannot be found.
The sjcl.js library does export the sjcl object so that doesn't seem to be it.
Any ideas on how I can gain access to the sjcl library from within my routers file?
Next I try to call sjcl.encrypt in my routes/journal.js file, but get an error that it's not defined.
require() just returns an object representing that module.
var x = require(...) assigns that object to a local variable.
It doesn't affect other .js files.
Next I tried requiring the the library in my journal.js file at the beginning, but get the module ./lib/sjcl.js cannot be found.
That would happen if your relative path is wrong.
Related
Hello there I'm importing a dynamic file with require, but my file is outside of /src so I check a post that say if I comment two lines in ./node_modules/react-scripts/config/webpack-config.js
I can access to files outside of /src, the problem is that if I do this works fine:
Show PDF
but if i want to be dynamic receiving the path through props i get this error:
Error: Cannot find module '../../../../../files/asd.pdf'
Where my code is this and this.state.fullPath is the same of before.
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I try concatenating a empty string but still not working
This is a problem that relates to the module bundler that you are using. In order for it to work, the require function has to get a path which the bundler will use to import the module at build time rather than runtime. You will need to use require using the full path and not a variable.
You can try something like:
const one = require('./path/to/one.pdf');
const two = require('./path/to/two.pdf');
const href = variable === 1 ? one : two;
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I want to load a local version of node-opcua with 'require' inside a HTML file, but it does not really work. The code snippet is the following:
<script type="text/javascript" src="path_to_require.js"></script>
<script>
var opcua = require(["path_to_node-opcua"]); <!-- Yes, the path is correct >
var client = new opcua.OPCUAClient();
...
When I execute the script I get the following error in the console:
Uncaught TypeError: opcua.OPCUAClient is not a constructor
Hence, var opcua is loaded correctly, but OPCUACluent is not, although the class is declared in a file that is present in the node-opcua folder called opcua_client.js under node-opcua\lib\client\
Sources:
The 'require' script from http://requirejs.org/docs/download.html#requirejs.
The node-opcua folder with the console command
npm install node-opcua.
node-opcua is not intended to run inside a browser as it relies on nodejs specific features such as filesystem access, crypto and so on.
You need to use browserify if you want to use that module in client. You will also need to look at how to use browserify with file system access (it can be done if paths are known ahead of time).
I am relatively new to Node.js and have been looking around but cannot find a solution. I did check the require javascript file and it does not seem to have a method for "readFileSync". Perhaps I don't have a proper require file? I had a hard time finding this file, everywhere talked about it but most people did not post where to get it.
I installed Node.js and have the require.js file. My current code is like this:
fs = require(['require'], function (foo) {
//foo is now loaded.
});
console.log("\n *STARTING* \n");
// Get content from file
var contents = fs.readFileSync("sliderImages", 'utf8');
I had a bit at first getting require to work however it seems to load the require JavaScript file. I have been following guides and I am not sure why I get this error:
Uncaught TypeError: fs.readFileSync is not a function
I have tried many fixes and cannot seem to figure this one out.
Node.js does not use Require.js. Require.js was built so that you could have asynchronous module loading on the client-side (in your browser).
Node.js uses CommonJS style modules. Your code using CommonJS would look like this:
var fs = require('fs');
console.log("\n *STARTING* \n");
var contents = fs.readFileSync("sliderImages", "utf8");
If we assume you saved this in a file called main.js you would then enter this command in your console (make sure you are in the same directory as the file):
node main.js
This code will not run in the browser. Node.js runs on the server. If you want to load a JSON file on the browser side then you'll need to load it using AJAX. There are numerous resources available to show you how to do this. Be aware that you must either run your page from a server or have a special flag enabled to load in files from the file system.
This error can arise if you write
const fs = import('fs');
in a Node module
but should write
import fs from 'fs';
I'm using the Yeoman Generator Angular Fullstack and I'd like to reuse JS code from different directories within my server directory. I'm referencing the file that has the functions I want like:
var something = require('/.path');
I get the error: "Cannot find module" in my terminal.
I tried a number of variations of the path working through all of the levels from server level down to file level where the given functions are contained. I looked at a few tutorials:
http://www.sitepoint.com/understanding-module-exports-exports-node-js/
AND
https://www.launchacademy.com/codecabulary/learn-javascript/node/modules
I clearly missed something. Each module of my nodejs has a controller with an exports.create function. All of my code for each module is contained within my exports.create function accept for other required modules. I have no problem requiring underscore or other libraries in my Node/Bower modules by the way.
To be as detailed as can be, I expected
var something = require('./directory/directory.controller.js');
var something = require('/.path');
The path you are using is likely incorrect. Probably you want to open the file called path.js contained in the same folder of the file from which you are importing it. In order to do that, you should change the import as follows :
var something = require('./path');
./path is a relative path where . stands for current directory.
/.path is an absolute path. In this case require is importing a hidden file in the root directory. I guess is not what you want.
I tried to add some custom functions into the FS module of NodeJS, this module is part of NodeJS' core programs. I found the corresponding file (fs.js) in the following location: /usr/lib/nodejs. The problem was that the changes that I've made seemed to not affect anything when the corresponding module and function was called.
What I did was I added a function like this in /usr/lib/nodejs/fs.js:
fs.someRandomFunc = function(){return 'Yeah!'}
However, when I called the function, it replied :
var fs = require('fs')
console.log(fs.someRandomFunc())
// Error Message
TypeError: Object #<Object> has no method 'someRandomFunc'
By the way, this also happens to the other core modules, such as module.js and path.js. Does this happen because NodeJS caches the core JS program instead of loading it from /usr/lib/nodejs?
Any idea to resolve this issue would be appreciated.
Thanks!
fs is part of NodeJS' Core Modules. As such, it is compiled into binary and distributed. So modifying the source is not going to take effect unless you recompile them.
It is anyway not a good idea to modify Node's source files directly. What you can/should instead is extend the existing fs module with your own functions, like graceful-fs does, or replace it entirely with your version, like fs-extra does.