Developer resources#

The following developer resources help you get started developing on the Concordium network.

All of our repositories are on GitHub.


See Node setup for information about the requirements to run a node and the available platforms for nodes.

For testing purposes, a node is available on testnet to use when testing smart contracts and dApps. You can use this node for API calls of chain methods only with gRPC v2 and gRPC web. The address is on port 20000 (gRPCv2 and gRPC-web). You can use this node for API calls of chain methods only. This node is maintained by Concordium, but Concordium does not guarantee availability. The status of this node is available on the Testnet status page.

SDKs and APIs

The following SDKs and APIs exist for developing on the Concordium network.

There is also a Concordium gRPC V2 API. It is recommended to use the SDKs.

The following NPM libraries are useful for building web-based dApps:

Smart contracts

See Smart contracts for general information about smart contracts, including a list of the available smart contract development tools to make creation, testing, and deployment easier.

The main library for developing smart contracts can be found on


See How to create proofs for dApps and services for information about how to write statements that interact with Concordium wallets.

For information about how to create proofs to verify identity for dApps and services see Create proofs.

If you want to familiarize yourself with how proofs work and can be constructed as well as test them, you can use the Concordium Proof Explorer to create proofs and send them to a Concordium Wallet for Web to see how they interact with account credentials and verifiable credentials. The Concordium Proof Explorer works on Testnet. You can use the Web3Id Issuer Front End to create verifiable credential to test with the proof explorer.

If you decide that you want to become an issuer of verifiable credentials, see Web3 ID issuers to learn more and access the production ready tools to become an issuer.


Concordium has a selection of example dApps that you can clone to make your own dApps or for inspiration. Additionally, all of these example dApps are hosted so you can try the functionality on Concordium’s testnet.

For a full list of dApp examples and resources, see dApp examples.

Starting a new project on the Concordium blockchain? Have a look at the dApp starter template!

Block explorers and analytics

The following are links to the block, node, and status explorers.

Concordium status pages

For information about the status pages, see Status pages.


For information about CCDScan, see CCDScan.

Grafana® node dashboard

For node runners using Grafana, Concordium provides a node performance dashboard using the exposed Prometheus metrics. You can download it from the Grafana marketplace.

Transaction logger

An external transaction logger service


See Indexers for more information.

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