> ## Documentation Index > Fetch the complete documentation index at: https://docs.blockscout.com/llms.txt > Use this file to discover all available pages before exploring further. # ENV Variables > Environment variables for configuring Blockscout instances. 🚗 [Autoscout is now available](/using-blockscout/autoscout), providing a simple one-click explorer deployment with Blockscout's optimized hosting infrastructure. Use it for early testing, modifications, and launching a full production-grade explorer. [**Get Started Now**](/using-blockscout/autoscout) **and have your explorer up-and-running in minutes.** Blockscout uses ENVs for setting hundreds of different parameters. Please see the various sections for ENV names, descriptions, default values and versioning. * [Backend ENVs: Common](/setup/env-variables/backend-env-variables) * [Backend ENVs: Chain Specific](/setup/env-variables/backend-envs-chain-specific) * [Backend ENVs: Integrations](/setup/env-variables/backend-envs-integrations) * [Frontend ENVs: Common](/setup/env-variables/frontend-common-envs) You will find deprecated ENV vars on the [Deprecated ENV Variables](https://docs.blockscout.com/for-developers/information-and-settings/deprecated-env-variables) page. ## Set ENV Variables with CLI Use the export command to set variables. For example: ```javascript theme={null} $ export ETHEREUM_JSONRPC_VARIANT=nethermind $ export COIN=POA $ export NETWORK=POA ``` ## Required ENV variables Please see the [Backend ENVs page](/setup/env-variables/backend-env-variables) for details. Required variables are located in the General Management section and marked with a ✅ ## Example ENV Variables Set The following variables are set for the [Gnosis Chain Blockscout Instance](https://gnosis.blockscout.com/). *Note that some variables are not included as they contain private information which should not be exposed.* 6KB ## Time format Can be set in format `1h` for 1 hour, `1m` for 1 minute, `1s` or `1` for 1 second, `1ms` for 1 millisecond *Note*: **Before release 5.1.2, all environment variables of time format supported only integers in seconds (without dimensions) as values.**