# Running a local node w/ custom chainConfig.json **URL:** \ **Category:** Tooling and IDE\ **Tags:** testnet, tutorials\ **Created:** [February 19, 2024, 9:31am UTC](https://forum.fuel.network/t/running-a-local-node-w-custom-chainconfig-json/4345 "2024-02-19T09:31:55Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![theAusicist](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.fuel.network/theausicist/32/1987_2.png) [@theAusicist](https://forum.fuel.network/u/theAusicist)\ **Post date:** [February 19, 2024, 9:31am UTC](https://forum.fuel.network/t/running-a-local-node-w-custom-chainconfig-json/4345/1 "2024-02-19T09:31:56Z")
Following [this guide](https://docs.fuel.network/guides/running-a-node/running-a-local-node/) to run a local node on my machine to test my contracts out. Trying to customize the `chainConfig.json` file to be able to have custom wallets for testing. Tried to generate some dummy wallets via `forc-wallet`, but either the option isn’t there (to generate multiple, or I haven’t been looking hard enough). I ended up using Fuel wallet to generate some dummy wallets. As an example, here is a dummy wallet (don’t care what happens to it, no funds stored here). ```bash priv_key = 0x49f392ff2b701a2e2be789950a491c416c62c3cbc7082236bb696ee167360ad7 Address = fuel17cfuuy9qtepm2rl77sw0dvdvfzc25nec856ex5kmhqx5nup2q03sa48fhu ``` The address is Bech32-style, but in the `chainConfig.json`, it appears to be in hex-format (in the docs: _The `owner` address must be a `B256` type address (begins with `0x` ) instead of a `Bech32` type (begins with `fuel` )_). ```json "initial_state": { "coins": [ { "owner": "0x72dd6103daeaed398609a2ec3905f07ae4b5188a698fd1472306488b9e48245d", "amount": "0x1000000000000000", "asset_id": "0x0000000000000000000000000000000000000000000000000000000000000000" } ] } ``` ~How can I get the B256 type-address from the Bech32 format? Is _0x72dd6103daeaed398609a2ec3905f07ae4b5188a698fd1472306488b9e48245d_ the private key for the owner because I have tried doing so, but the queried balances is zero~ (**[solved here](https://forum.fuel.network/t/fuel-address-format-in-graphql-queries/3067)**) For context, here’s the output when I try to run my local node. ```bash ❯ fuel-core run --chain ./chainConfig.json --db-type in-memory 2024-02-19T09:36:00.225955Z INFO fuel_core::cli::run::relayer: 63: Relayer service disabled 2024-02-19T09:36:00.226100Z INFO fuel_core::cli::run::p2p: 237: P2P service disabled 2024-02-19T09:36:00.226104Z INFO fuel_core::cli::run: 264: Block production mode: Instant 2024-02-19T09:36:00.226425Z WARN fuel_core::cli::run: 273: Fuel Core is using an insecure test key for consensus. Public key: 73dc6cc8cc0041e4924954b35a71a22ccb520664c522198a6d31dc6c945347bb854a39382d296ec64c70d7cea1db75601595e29729f3fbdc7ee9dae66705beb4 2024-02-19T09:36:00.226443Z WARN fuel_core::cli::run: 294: The coinbase recipient `ContractId` is not set! 2024-02-19T09:36:00.226451Z INFO fuel_core::cli::run: 358: Fuel Core version v0.22.0 2024-02-19T09:36:00.226498Z WARN new{name=fuel-core}: fuel_core::service::config: 122: The `utxo_validation` should be `true` with disabled `debug` 2024-02-19T09:36:00.226508Z WARN new{name=fuel-core}: fuel_core::service::config: 133: The `utxo_validation` of `TxPool` was inconsistent 2024-02-19T09:36:00.226511Z WARN new{name=fuel-core}: fuel_core::service::config: 137: The `utxo_validation` of `BlockProducer` was inconsistent 2024-02-19T09:36:00.226518Z INFO new{name=fuel-core}: fuel_core::service: 189: Initializing database 2024-02-19T09:36:00.226678Z INFO new{name=fuel-core}:_commit_result{block_id=b1807ca9f2eec7e459b866ecf69b68679fc6b205a9a85c16bd4943d1bfc6fb2a height=0 tx_status=[]}: fuel_core_importer::importer: 264: Committed block 0xb1807ca9f2eec7e459b866ecf69b68679fc6b205a9a85c16bd4943d1bfc6fb2a 2024-02-19T09:36:00.226694Z INFO new{name=fuel-core}: fuel_core::service: 194: Initializing sub services 2024-02-19T09:36:00.227701Z INFO new{name=fuel-core}: fuel_core::graphql_api::service: 216: Binding GraphQL provider to 127.0.0.1:4000 2024-02-19T09:36:00.227784Z INFO new{name=fuel-core}:initialize_loop{service="SyncTask"}: fuel_core_services::service: 298: The service SyncTask is shut down 2024-02-19T09:36:00.227813Z INFO new{name=fuel-core}:initialize_loop{service="ImportTask"}: fuel_core_services::service: 298: The service ImportTask is shut down 2024-02-19T09:36:00.227829Z INFO new{name=fuel-core}:initialize_loop{service="FuelService"}: fuel_core_services::service: 330: Starting FuelService service 2024-02-19T09:36:00.227852Z INFO new{name=fuel-core}:initialize_loop{service="GraphQL"}: fuel_core_services::service: 330: Starting GraphQL service 2024-02-19T09:36:00.227885Z INFO new{name=fuel-core}:initialize_loop{service="TxPool"}: fuel_core_services::service: 330: Starting TxPool service 2024-02-19T09:36:00.227906Z INFO new{name=fuel-core}:initialize_loop{service="PoA"}: fuel_core_services::service: 330: Starting PoA service 2024-02-19T09:36:00.227913Z INFO new{name=fuel-core}:initialize_loop{service="PoASyncTask"}: fuel_core_services::service: 330: Starting PoASyncTask service ``` There’s nothing beyond this, it doesn’t update with new blocks (is this normal)? ---
**Author:** ![calldelegation](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.fuel.network/calldelegation/32/1484_2.png) [@calldelegation](https://forum.fuel.network/u/calldelegation)\ **Post date:** [February 19, 2024, 3:16pm UTC](https://forum.fuel.network/t/running-a-local-node-w-custom-chainconfig-json/4345/2 "2024-02-19T15:16:20Z")
> [@theAusicist](#): > > `fuel-core run --chain ./chainConfig.json --db-type in-memory` Hey @theAusicist, just a heads up this is your local node, and it’s separate from our beta-5 testnet. To start seeing blocks, you’ll need to begin submitting transactions to it because it wont produce empty blocks. Owner in the chainConfig is a public key NOT a private key You are also missing the flag `--debug` `fuel-core run --chain ./chainConfig.json --db-type in-memory --debug` Hope this helps! ---
**Author:** ![theAusicist](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.fuel.network/theausicist/32/1987_2.png) [@theAusicist](https://forum.fuel.network/u/theAusicist)\ **Post date:** [February 19, 2024, 4:40pm UTC](https://forum.fuel.network/t/running-a-local-node-w-custom-chainconfig-json/4345/3 "2024-02-19T16:40:19Z")
oh, so it won’t be similar to Beta-5? I understand the local node is not the Beta-5 testnet per-se, but will it mirror the ops and functionalities? Want to do local tests with said node, but the local node won’t mirror Beta-5, then I’ll need to look elsewhere ---
**Author:** ![calldelegation](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.fuel.network/calldelegation/32/1484_2.png) [@calldelegation](https://forum.fuel.network/u/calldelegation)\ **Post date:** [February 19, 2024, 6:51pm UTC](https://forum.fuel.network/t/running-a-local-node-w-custom-chainconfig-json/4345/4 "2024-02-19T18:51:15Z")
Apologies for the misunderstanding. Yes, as long as you are using the latest beta-5 toolchain and conforming to this chain configuration (you can customize addresses, balances etc.), it will mirror beta-5. > ---
**Author:** ![theAusicist](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.fuel.network/theausicist/32/1987_2.png) [@theAusicist](https://forum.fuel.network/u/theAusicist)\ **Post date:** [February 20, 2024, 3:47am UTC](https://forum.fuel.network/t/running-a-local-node-w-custom-chainconfig-json/4345/5 "2024-02-20T03:47:31Z")
yup, many thanks! ‎ ‎ ‎ ‎ ---
**Author:** ![system](https://us1.discourse-cdn.com/flex022/uploads/fuel/original/2X/5/57d5a345cc15a64b636e0d56e042857f8a0e80b1.png) [@system](https://forum.fuel.network/u/system)\ **Post date:** [March 11, 2024, 11:48pm UTC](https://forum.fuel.network/t/running-a-local-node-w-custom-chainconfig-json/4345/6 "2024-03-11T23:48:23Z")
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