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Questions tagged [hyperledger-composer]

Hyperledger Composer (previously Fabric Composer) provides a layer of abstraction on top of the Hyperledger Fabric blockchain for building business applications. Please use this tag for questions relating to the use of Hyperledger Composer, but not general Hyperledger Fabric questions. Defects in Hyperledger Composer should be reported as GitHub issues.

Hyperledger Composer provides a layer of abstraction on top of the Hyperledger Fabric blockchain. Developers can design in terms of business networks, participants, identity, assets, registries, transactions, events and links, in contrast to the low level abstractions of chaincode and key-value stores.

The composer modelling language makes it easy for developers to model the specific nature of their business domains. The interactive web Playground allows them to author and test these models, and then create domain specific APIs for developers building applications.

Developers can use Composer tools to create applications which exploit these APIs, and create loopback connectors which provide connectivity between the blockchain and their existing systems.

We're keen to build a community so please take a look!

Environments

Hyperledger Composer is a node.js framework available under the Apache-2 license. Hosted in github, using Travis-ci and npm.

Getting Started

Our getting started guide will help you install Hyperledger Composer, define and deploy a business network and start to integrate the network with applications.

Resources

Deprecated

Update Aug 29th 2019: Hyperledger Composer has been deprecated. Please see the README for more information.

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Hyperledger Composer: Where is the Open API Specification generated by composer-rest-server stored?

I want to use the specification in to generate a Java client using swagger codegen in order to consume the REST API from a Java application. Where do I find the Open API spec after I start the composer-rest-server? I've tried looking it up but I…
blahblahblah
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Is uploading Business Network Cards to Composer REST servers a huge security flaw?

Is the uploading of .card files to Composer REST server a huge trust issue because the server will have a copy of a participant's private key? According to docs, Business Network Cards (.card) files contain: A Connection Profile. (.json) A metadata…
dtylam
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Not able to query fabric using newly created identity in hyperledger composer'

I issued new identity to already existing participant by composer rest server and got it activated. Now in wallet section section I selected the new card to use composer rest server. ACL for participant is: rule SimpleRule { description:…
user9040429
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Hyperledger Composer Playground on wrong version

When I install Hyperledger Composer Playground using npm install -g composer-playground It install a version of Playground that says Playground v0.16.3 When I attempt to connect to the blockchain it says with Composer Playground is says Composer…
Some Guy Trying To Do Math
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Hyperledger-Composer-Rest-Server - REST API public

Is there any way to run the Rest-Server of Hyperledger Composer on another IP/Network than running on a localhost-port ?
M.Noack
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Upload csv file data on hyperledger fabric network

How to upload csv file data on hyperledger fabric network to be able to retrieve it and perform some analysis and again want to upload it on network?
Aqeel
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Composer v0.16.5 error - admin has not been registered

I have just updated to composer v0.16.5 and when I try to set up my network as I would normally I keep getting an error: Error: Error trying to ping. Error: Error trying to query business network. Error: chaincode error (status: 500, message:…
Simon Mullaney
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I have 2 business networks A and B, Participants of A want to Read an updated Asset of B. Is this scenario possible?

I am curious to know on this, as this would make designing complex business networks simpler.
ArpitS
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Can you look at your certificate authorities database to see what users are enrolled in it?

I'm just wondering if there is any way to look at your certificate authorities database to see what users are enrolled in it? Is there any UI or anything to access it?
Simon Mullaney
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Chaincode using GO or Composer

I understand that chaincode(smart contracts) on hyperledger-fabric can be written using golang. But the other thing I see as of fabric 1.0 is the composer - where I could write the 'transactions' part using JS. Is the difference that go APIs give me…
Shashikant Soni
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how to access the 'eventEmitted' field in transaction history of hyperledger fabric

I am working on hyperledger fabric.I want to access the 'eventEmitted' field in transaction history of hyperledger fabric. /*transaction history*/ "transactionType": "com.acn.hps.aops.ims.addingEvidence", "eventsEmitted": [ { "$class":…
Akshay Indalkar
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Access Control of hyperledger composer

I am a beginner with hyperledger composer, I am not clear with ACL (access control) in hyperledger composer. Sorry, if my question have problem. Why we need ACL? When we use it? Where we use it?
Dara Sok
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Ability to use participant identity created with Composer CLI to launch composer rest server

I have created participants using the node CLI and Business Network Connection. I have also assigned them with an identity. Now; is it possible to use this identity to launch the composer-rest-server as this participant? E.g. could this be turn into…
ChrisMcQueen
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Hyperledger Composer: Error: Error trying to ping. Error: Error trying to query business network. Error: Connect Failed

I'm following this link: Hyperledger Composer Queries Tutorial to update an existing business network. Till step:3 everything working fine for me. But whenever I am executing step:4 (2) command I'm getting some error. This is the error: Error:…
Sourav Bhattacharjee
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Hyperledger Composer REST API Call failed at some variables from concept

I have in my asset "AirPollution" some concept e.g "CarbonMonoxide". But if i call rest-composer-server in terminal, it gives me some error: REST server error Here my code snippet: asset AirPollutionData identified by airPollutionDataId { o…
kerberos17
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