I am a beginner in dart/flutter programming and I could use some help with using the json_serializable plugin:
I´ve set everything up according to this tutorial: https://flutter.io/json/
but the one thing that is never mentioned is how to load the .json file into a JSON string for the .decode method in the end.
I´ve seen a lot of people using an async function to load it, but I can´t get it to work and another question I have is how does the json_serializable load it? According to my research (https://pub.dartlang.org/packages/json_serializable) it produces a Dart field with the contents of a file containing JSON. Is it possible to also use this in the .decode method?
Would be great if someone could give me answers to my questions.
Related
I'm using Postman and sending various requests that get responses in XML or JSON. I want to understand how JSON works with the APIs. I know that JSON is a called response and I know how to write a JSON file and read it and understand it, although I've never actually used it.
So, my question is how does JSON show up on the website?
I imagine someone has to code it there, similar to HTML.
When I google, I just basically get how-to instructions on various tools from a procedural standpoint and nothing relevant to my question.
I am new to wso2 API Manager, trying to set it up expose my plain HTTP POST back end calls as a REST API. I am sure this is not a new pattern that I am trying to achieve here. The requirement is to convert the JSON data coming in (has array structures) into the HTTP URL query string parameters.
After some research through the documentation and other posts on this forum, decided to go with the script mediator that would parse the JSON data and convert it to a string that can be appended to the endpoint URL. Some how I am not able to achieve this.
I have followed the following post that seems to be very straight forward. As the original poster suggested, I am also not able to use getPayloadJSON() method. Even have trouble using the work around suggested there due to JSON.parse() not working.
Link
Also, this approach of editing the service bus configuration from source view does not sound like the correct option. Is there another elegant solution to achieve this? Thanks for the help in advance.
I was able to get both methods working by using an external script instead of the inline java script. Thanks
I am trying to achieve something like which is mentioned in this link
but i don't know whereto write the parsing code. I tried to write it in new method and added the method in "my adapter.xml" but nothing happens. I even don't know how to log in IBM WorkLight. I used WL.logger(some) but its throwing error that "Logger can not be called on an object".
Any help would be appreciated. Thanks in advance.!
In most cases you don't need to manually parse responses because WL adapter framework will do this for you. Anything you retrieve via WL.Server.invokeHttp API will be parsed to JSON automatically unless you specify returnedContentType:"plain". In case you DO need to manually parse JSON you can use JSON.parse() and JSON.stringify() APIs.
Server side logging is achieved via WL.Logger.debug/error/info etc. You can get more info about it here
You don't have to parse JSON data, there are libraries in Javascript to do that. Try JSON.parse(). You should learning how to write adapters and invoking them from clients. The Getting Started modules are a good place to start, specifically Module 4 in your case.
I am loading data from a mongodb collection to a mysql table through Kettle transformation.
First I extract them using MongodbInput and then I use json input step.
But since json input step has very low performance, I wanted to replace it with a
javacript script.
I am a beginner in Javascript and even though i tried somethings, the kettle javascript script is not recognizing any keywords.
can anyone give me sample code to convert Json data to different columns using javascript?
To solve your problem you need to see three aspects:
Reading from MongoDB
Reading from JSON
Reading from (probably) String
Reading from MongoDB Except if you changed the interface, MongoDB returns not JSON but BSON files (~binary JSON). You need to see the MongoDB documentation about reading and writing BSON: probably something like BSON.to() and BSON.from() but I don't know it by heart.
Reading from JSON Once you have your BSON in JSON format, you can read it using JSON.stringify() which returns a String.
Reading from (probably) String If you want to use the capabilities of JSON (why else would you use JSON?), you also want to use JSON.parse() which returns a JSON object.
My experience is that to send a JSON object from one step to the other, using a String is not a bad idea, i.e. at the end of a JavaScript step, you write your JSON object to a String and at the beginning of the next JavaScript step (can be further down the stream) you parse it back to JSON to work with it.
I hope this answers your question.
PS: writing JavaScript steps requires you to learn JavaScript. You don't have to be a master, but the basics are required. There is no way around it.
you could use the json input step to get the values of this json and put in common rows
I am a noob at this and I apologize for the simple question but I looked everywhere and have not found any answers to my problem. Is there any way to parse a string in iOS to JSON? Particularly for the iPhone.
So far I have managed to download the JSON API for iPhone and parsed JSON. But that is as far as I got.
I apologize for my english if I sound vague or not straight to the point.
TouchJSON is available # https://github.com/stig/json-framework/
Use TouchJSON Writer class to create JSON File as using this class JSON can be created from dictionary and array.