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  2. Tutorials
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Data indexing service

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Last updated 3 years ago

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Because there's no server, every data of a DApp will be stored on blockchain. And keeping track of all those datas is too complicated if getting data directly from blockchain.

To solve this, DApp's developers need to use a data indexing service, such as .

The Graph is a decentralized protocol for indexing and querying data from blockchains, starting with Ethereum. It makes it possible to query data that is difficult to query directly. Luckily, The Graph open-sourced their source code and build a Docker image so that every developers can run their own graph on any EVM-compatible network.

To start running your graph node:

  1. Download the docker-compose.yml file from .

  2. Edit ethereum field to mainnet:https://rpc.kardiachain.io

  3. Run docker-compose up -d

After that, a GraphQL playground will be served on port 8000.

The Graph
The Graph's public repo