> ## 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.

<Tip>
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Blockscout uses ENVs for setting hundreds of different parameters. Please see the various sections for ENV names, descriptions, default values and versioning.

<Info>
  * [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)
</Info>

<Warning>
  You will find deprecated ENV vars on the [Deprecated ENV Variables](https://docs.blockscout.com/for-developers/information-and-settings/deprecated-env-variables) page.
</Warning>

## 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.*

<Card title="Gnosis-Chain-Variables.txt" icon="file-arrow-down" horizontal href="https://1077666658-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-Lq1XoWGmy8zggj_u2fM%2Fuploads%2Fgit-blob-6ca29409491d82049d08c1b49886487cc8960e65%2FGnosis-Chain-Variables.txt?alt=media">
  6KB
</Card>

## 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

<Warning>
  *Note*: **Before release 5.1.2, all environment variables of time format supported only integers in seconds (without dimensions) as values.**
</Warning>