aeson | A fast Haskell JSON library | JSON Processing library

by haskell Swift Version: Current License: Non-SPDX

X-Ray Key Features Code Snippets Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | aeson Summary

aeson is a Swift library typically used in Utilities, JSON Processing applications. aeson has no bugs, it has no vulnerabilities and it has medium support. However aeson has a Non-SPDX License. You can download it from GitHub.

A fast Haskell JSON library

Support

Quality

Security

License

Reuse

Support

aeson has a medium active ecosystem.

It has 1013 star(s) with 238 fork(s). There are 35 watchers for this library.

It had no major release in the last 6 months.

There are 52 open issues and 348 have been closed. On average issues are closed in 528 days. There are 14 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of aeson is current.

Quality

aeson has no bugs reported.

Security

aeson has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

aeson has a Non-SPDX License.

Non-SPDX licenses can be open source with a non SPDX compliant license, or non open source licenses, and you need to review them closely before use.

Reuse

aeson releases are not available. You will need to build from source code and install.

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aeson Key Features

No Key Features are available at this moment for aeson.

aeson Examples and Code Snippets

No Code Snippets are available at this moment for aeson.

Community Discussions

Trending Discussions on aeson

Haskell - how do I convert piped-in JSON-based to a data record?

Unions Data.Map singletons inside an IO

In what does this simple do notation desugar to?

Prevent unknown field names in Aeson parseJSON

Improving Haskell performance for small GET requests

Reading nested JSON data encoded as a nested string with Aeson

Number (realToFrac) creates float with too many trailing digits in Aeson

Encoding Algebraic Data Types with Aeson in Haskell

How to process HttpResponseBody in Haskell req?

Building Haddock documentation without compiling the source

QUESTION

Haskell - how do I convert piped-in JSON-based to a data record?

Asked 2021-Jun-08 at 01:17

I'm building a reinforcement learning library where I'd like to pass certain instance information into the executables via a piped JSON.

Using aeson's Simplest.hs, I'm able to get the following basic example working as intended. Note that the parameters are sitting in Main.hs as a String params as a placeholder.

I tried to modify Main.hs so I would pipe the Nim game parameters in from a JSON file via getContents, but am running into the expected [Char] vs. IO String issue. I've tried to read up as much as possible about IO, but can't figure out how to lift my JSON parsing method to deal with IO.

How would I modify the below so that I can work with piped-in JSON?

Main.hs

...

ANSWER

Answered 2021-Jun-08 at 01:17

getContents returns not a String as you apparently expect, but IO String, which is a "program", which, when executed, will produce a String. So when you're trying to parse this program with decode, of course that doesn't work: decode parses a String, it cannot parse a program.

So how do you execute this program to obtain the String? There are two ways: either you make it part of another program or you call it main and it becomes your entry point.

In your case, the sensible thing to do would be to make getContent part of your main program. To do that, use the left arrow <-, like this:

Source https://stackoverflow.com/questions/67879895

QUESTION

Unions Data.Map singletons inside an IO

Asked 2021-May-29 at 14:13

I am struggling with applying Data.Map.unions to a list of Data.Map singletons wrapped in an IO. Here is my code:

...

ANSWER

Answered 2021-May-29 at 14:13

The lambda expression:

Source https://stackoverflow.com/questions/67752191

QUESTION

In what does this simple do notation desugar to?

Asked 2021-May-29 at 11:12

I'm using Aeson and Network.HTTP. I was able to encode a json and print it on the screen doing the following:

...

ANSWER

Answered 2021-May-29 at 01:44

get "http://jsonplaceholder.typicode.com/todos/1" >>= (\x -> let y = encode x in B.putStrLn y)

Source https://stackoverflow.com/questions/67746748

QUESTION

Prevent unknown field names in Aeson parseJSON

Asked 2021-May-04 at 00:22

With the following type and instance deriving:

...

ANSWER

Answered 2021-May-04 at 00:22

Don't forget that the q you have access to in withObject is just a HashMap. So, you can write:

Source https://stackoverflow.com/questions/67375099

QUESTION

Improving Haskell performance for small GET requests

Asked 2021-May-02 at 00:04

In an effort to become better with Haskell, I'm rewriting a small CLI that I developed originally in Python. The CLI mostly makes GET requests to an API and allows for filtering/formatting the JSON result.

I'm finding my Haskell version to be a lot slower than my Python one.

To help narrow down the problem, I excluded all parts of my Haskell code except the fetching of data - essentially, it's this:

...

ANSWER

Answered 2021-May-02 at 00:04

It seemed odd that the performance of a common Haskell library was so slow for me, but somehow this approach solved my concerns:

I found that the performance of my executable was faster when I used stack install to copy the binaries:

Source https://stackoverflow.com/questions/67348097

QUESTION

Reading nested JSON data encoded as a nested string with Aeson

Asked 2021-Apr-30 at 20:52

I have this weird JSON to parse containing nested JSON ... a string. So instead of

...

ANSWER

Answered 2021-Apr-30 at 20:52

A couple problems here.

First, your use of is nonsensical. I'm going to assume it's a typo, and what you actually meant was <$>.

Second, the type of decodeAuthors is ByteString -> Authors, which means its parameter is of type ByteString, which means that the expression v .: "author" must be of type Parser ByteString, which means that there must be an instance FromJSON ByteString, but such instance doesn't exists (for reasons that escape me at the moment).

What you actually want is for v .: "author" to return a Parser String (or perhaps Parser Text), and then have decodeAuthors accept a String and convert it to ByteString (using pack) before passing to decode:

Source https://stackoverflow.com/questions/67335775

QUESTION

Number (realToFrac) creates float with too many trailing digits in Aeson

Asked 2021-Apr-28 at 08:57

A few experiments with Data.Aeson.Types.Internal.Number

...

ANSWER

Answered 2021-Apr-27 at 17:10

For various reasons, there is no perfect solution. You might like fromFloatDigits -- it will do better with 10.4, but worse with some other numbers.

Source https://stackoverflow.com/questions/67287381

QUESTION

Encoding Algebraic Data Types with Aeson in Haskell

Asked 2021-Apr-27 at 15:50

I have the following ADT implementation:

...

ANSWER

Answered 2021-Apr-27 at 15:50

From the documentation, we simply need to provide a function of type FeatureValue -> Value. The definition of Value is also documented and fully exported. So just follow your nose.

Source https://stackoverflow.com/questions/67286262

QUESTION

How to process HttpResponseBody in Haskell req?

Asked 2021-Apr-13 at 00:08

I have an application that gets JSON response from an API and I'm trying to get a specific key from that response. The working code looks as below:

...

ANSWER

Answered 2021-Apr-13 at 00:08

HttpResponseBody is a red herring. It's an associated type, and HttpResponseBody (JsonResponse a) is the same as just a, so HttpResponseBody (JsonResponse Object) is really just Object. As such, once you have body, req's job is done, and it's now just aeson that you need to be concerned with.

Since body is an Object (which happens to already be a HashMap Text Value) and not a list of tuples, you can't use Prelude's lookup on it. Do this instead:

Source https://stackoverflow.com/questions/67064773

QUESTION

Building Haddock documentation without compiling the source

Asked 2021-Apr-11 at 12:05

I'm working on a Haskell library that contains parts that target WebAssembly (WASM) using Asterius. These parts can't be compiled with the normal ghc and for that reason we have flags that exclude/include the WASM parts.

Trying to build the documentation with Asterius' ahc-cabal new-haddock fails. It seems to revert to the normal ghc for the Haddock command.

My question is: Can I build the Haddock documentation without compiling the source it describes?

Excerpts of my file that might be relevante:

Section of my cabal file:

...

ANSWER

Answered 2021-Apr-11 at 12:05

Instead of excluding your module Boardgame/Web.hs, which contains the imports that GHC can't process, entirely when the WASM flag is set, you could use CPP in Boardgame/Web.hs to conditionally set all non-GHC-compatible symbols to undefined.

The way I would do it is to move all type signatures to the top of the module, and make two sets of definitions, like so:

Source https://stackoverflow.com/questions/67022097

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install aeson

You can download it from GitHub.

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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