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kandi X-RAY | Node.js Summary
kandi X-RAY | Node.js Summary
Learn Node.js step by step, take you to learn Node.js from scratch! This warehouse is a Node.js learning graphic tutorial summarized by myself, which contains learning cases and source code (pubdreamcc original, welcome to reprint, welcome to star)
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const querystring = require('querystring');
axios.post('https://something.com/', querystring.stringify({ foo: 'bar' }));
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Trending Discussions on Node.js
QUESTION
I would like to extract the definitions from the book The Navajo Language: A Grammar and Colloquial Dictionary by Young and Morgan. They look like this (very blurry):
I tried running it through the Google Cloud Vision API, and got decent results, but it doesn't know what to do with these "special" letters with accent marks on them, or the curls and lines on/through them. And because of the blurryness (there are no alternative sources of the PDF), it gets a lot of them wrong. So I'm thinking of doing it from scratch in Tesseract. Note the term is bold and the definition is not bold.
How can I use Node.js and Tesseract to get basically an array of JSON objects sort of like this:
...ANSWER
Answered 2021-Jun-15 at 20:17Tesseract takes a lang
variable that you can expand to include different languages if they're installed. I've used the UB Mannheim (https://github.com/UB-Mannheim/tesseract/wiki) installation which includes a ton of languages supported.
To get better and more accurate results, the best thing to do is to process the image before handing it to Tesseract. Set a white/black threshold so that you have black text on white background with no shading. I'm not sure how to do this in Node, but I've done it with Python's OpenCV library.
If that font doesn't get you decent results with the out of the box, then you'll want to train your own, yes. This blog post walks through the process in great detail: https://towardsdatascience.com/simple-ocr-with-tesseract-a4341e4564b6. It revolves around using the jTessBoxEditor to hand-label the objects detected in the images you're using.
Edit: In brief, the process to train your own:
- Install jTessBoxEditor (https://sourceforge.net/projects/vietocr/files/jTessBoxEditor/). Requires Java Runtime installed as well.
- Collect your training images. They want to be .tiffs. I found I got fairly accurate results with not a whole lot of images that had a good sample of all the characters I wanted to detect. Maybe 30/40 images. It's tedious, so you don't want to do TOO many, but need enough in order to get a good sampling.
- Use jTessBoxEditor to merge all the images into a single .tiff
- Create a training label file (.box)j. This is done with Tesseract itself.
tesseract your_language.font.exp0.tif your_language.font.exp0 makebox
- Now you can open the box file in jTessBoxEditor and you'll see how/where it detected the characters. Bounding boxes and what character it saw. The tedious part: Hand fix all the bounding boxes and characters to accurately represent what is in the images. Not joking, it's tedious. Slap some tv episodes up and just churn through it.
- Train the tesseract model itself
- save a file:
font_properties
who's content isfont 0 0 0 0 0
- run the following commands:
tesseract num.font.exp0.tif font_name.font.exp0 nobatch box.train
unicharset_extractor font_name.font.exp0.box
shapeclustering -F font_properties -U unicharset -O font_name.unicharset font_name.font.exp0.tr
mftraining -F font_properties -U unicharset -O font_name.unicharset font_name.font.exp0.tr
cntraining font_name.font.exp0.tr
You should, in there close to the end see some output that looks like this:
Master shape_table:Number of shapes = 10 max unichars = 1 number with multiple unichars = 0
That number of shapes should roughly be the number of characters present in all the image files you've provided.
If it went well, you should have 4 files created: inttemp
normproto
pffmtable
shapetable
. Rename them all with the prefix of your_language
from before. So e.g. your_language.inttemp
etc.
Then run:
combine_tessdata your_language
The file: your_language.traineddata
is the model. Copy that into your Tesseract's data folder. On Windows, it'll be like: C:\Program Files x86\tesseract\4.0\tessdata
and on Linux it's probably something like /usr/shared/tesseract/4.0/tessdata
.
Then when you run Tesseract, you'll pass the lang=your_language
. I found best results when I still passed an existing language as well, so like for my stuff it was still English I was grabbing, just funny fonts. So I still wanted the English as well, so I'd pass: lang=your_language+eng
.
QUESTION
I'm trying to implement authentication using XSUAA. I can able login with my SAP CF credential and login is working fine. The problem is with logout.
When I try to logout, it gets redirect to the logout page but the session is not cleared. After logout when I try to hit the url, instead of login page, it's redirecting to the index page.
I followed the official document Authentication check with Node.js and AppRouter but still I'm unable to fix this issue.
These are my configuration files.
manifest.yml
...ANSWER
Answered 2021-Jun-15 at 08:06The SAP IAS Tenant was configured with OpenID connect. For some reason, logout functionality is not working with OpenID Connect and there is not clear document on this. Once switched from OpenID Connect to SAML, logout functionality is working fine. This is a work around and may not be an actual solution. It's an issue with SAP CF. They have to solve it.
This Blog will help you configure your IAS Tenant.
Note: Logout is not working with default identity provider too. And IAS Tenant is not available for trial accounts.
QUESTION
I have an application using ASP.NET Core MVC and an Angular UI framework.
I can run the application in IIS Express Development Environment without issue. When I switch to the IIS Express Production environment or deploy to an IIS host, my index referenced files cannot be read showing a browser error:
Uncaught SyntaxError: Unexpected token '<'
These pages look like they are loading the index page as opposed to the .js or .css files.
Here is a snippet of the underlying runtime.js as it should be loaded into browser, it is not loaded with index.html.
...ANSWER
Answered 2021-Jun-14 at 14:39Mayby you are missing
QUESTION
I have a react application (Node back end) running on Heroku (free option) connecting to a MongoDB running on Atlas (also free option). When I connect the application from my local machine to the Atlas DB all is fine and data retrieved (all 108 K records) in about 10 seconds, smaller amounts (4-500 records) of data in much less time. The same request from the application running on Heroku to the Atlas DB fails. The application running on Heroku can retrieve a small number of records (1-10) from the same collection of (108 K records), in less than a second. As soon as I try to retrieve a couple of hundred records the system fails. Below are the logs. I included the section of the logs that show a successful retrieval of 1 record and then failing on the request for about 450 records.
I have three questions:
- What is the cause of the issue?
- Is there a work around in the free option of Heroku?
- If there is no work around in the free option, what Heroku pay level will I need to get to and what steps will I need to take to get this working? I will probably upgrade in the future but want to prove all is working before going in that direction.
Logs:
...ANSWER
Answered 2021-Jun-14 at 18:09You're running out of heap memory in your node server. It might be because there's some statement that uses a lot of memory. You can try to find that or you can try to increase node memory like this.
QUESTION
I created a user registration form, in node I check to see if user and mail have already been used and give an error. someone can help me or send me an example?
Thank you
...ANSWER
Answered 2021-Jun-14 at 14:26What's happening is that all of your methods are being run. The code continues to execute even after a response has been sent, and if you try to send a response later in the code, it will throw this error.
This is because you are not using await
properly. You should not be using .then
with await
. If you use .then()
, when you return it will only return inside the callback function, but not in the outside function, so the code later will still execute. Try using something like this:
QUESTION
I'm trying to post a message to a Slack channel. If I do it from a browser, for example through the console with an Ajax request all works fine - I don't get any errors and the message gets posted to Slack.
However I need to do it from Node.js app so I chose to use Axios for the request itself. Here's my code
...ANSWER
Answered 2021-Jun-14 at 13:08Managed to get it running by setting proxy:false
and configuring an httpsAgent
, even though it does go through a proxy.
QUESTION
I am trying to run MERGE INTO query on OracleDB
in forEach loop on Node.js code. But only the first query executing and all other failings.
Code:
...ANSWER
Answered 2021-Jun-14 at 12:48Answering my own question so it can help other who have similar issue like this.
So after research on my issue and based on comments I can conclude that through bind variables and executeMany()
method we can achieve our goal.
Step 1: Prepare your bind parameters like below:
QUESTION
I am going through the tutorial provided by Autodesk forge on [RealityCapture API][1].
I would like to develop an app that would send pictures taking by my phone to the the Autodesk forge server and get in return a 3D model.
However I am stuck at the initialization stage of the processing. I have the following error message on my browser window:
...ANSWER
Answered 2021-Jun-03 at 08:54Note that you cannot use local filesystem paths when uploading files to the ReCap service. You're basically telling the ReCap server "download these 7 files from C:\Dataset\FlowerPot..." but the server obviously cannot access those.
To fix this, you have to either:
- make your photos accessible via some public URLs (for example, by uploading them to a temporary S3 bucket), or
- add the actual content of the images to the Axios request, for example, like so:
QUESTION
I am trying to serve my react app from Nodejs, but I am getting a GET
error which is odd because when I run npm start and run the react start script all works well, but once I use node.js it doesn't work. Also if I navigate to a route by typing it in or trying to navigate backward it throws an error. For example, when you first navigate to the homepage it takes you to a login page, and if I go to another page and then hit back it throws a GET
error even though it worked beforehand.
ANSWER
Answered 2021-Jun-13 at 23:09This behavior is coming from your express
app in the node.js server.
See your statement:
QUESTION
I am using this code to get the ip address in Node.js:
...ANSWER
Answered 2021-Jun-08 at 07:42What you could be looking for is Local Area Network Ip address:
You could use default function by Node.js os.networkInterfaces()
You could find the documentation here:
https://nodejs.org/api/os.html#os_os_networkinterfaces
You could also look into this thread:
Get local IP address in Node.js
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