> ## Documentation Index
> Fetch the complete documentation index at: https://docs.blnkfinance.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Overview
> Learn how Blnk configuration works with blnk.json and environment variables.
export const CtaCallout = props => {
const {title, buttonLabel, href, trackingEvent, buttonTarget, rel = "noopener noreferrer", children} = props;
const handleCtaClick = () => {
if (typeof window === "undefined" || !trackingEvent) {
return;
}
try {
window.dispatchEvent(new CustomEvent("blnk:docs-cta", {
detail: {
name: trackingEvent,
href
}
}));
} catch {}
try {
window.posthog?.capture?.(trackingEvent, {
href
});
} catch {}
const gaPayload = {
cta_href: href
};
try {
window.gtag?.("event", trackingEvent, gaPayload);
} catch {}
try {
window.dataLayer = window.dataLayer || [];
window.dataLayer.push({
event: trackingEvent,
...gaPayload
});
} catch {}
};
const isExternal = typeof href === "string" && (/^https?:\/\//i).test(href);
const target = buttonTarget ?? (isExternal ? "_blank" : undefined);
const linkRel = isExternal ? rel : undefined;
return ;
};
This is the documentation for Blnk's configuration file. This file defines how your instance runs, including database and Redis connections, transaction processing, security, notifications, observability, and backups.
You can set it up using a `blnk.json` file or environment variables that use the `BLNK_` prefix.
***
## Configuration structure
Blnk's configuration is grouped into the following sections. Click through to learn more about each section and its configuration options.
Runtime, secure mode, rate limits, and request size caps.
PostgreSQL, Redis, and Typesense.
Processing, batching, locking, coalescing.
Names, sharding, retries, hot lanes.
Strategy, progress updates, retries.
Slack and outgoing HTTP webhooks.
Logs, traces, metrics, and monitoring setup.
Flags and environment variables.
Local paths and S3 storage.
Required fields, defaults, options.
***
## Minimum required settings
To start Blnk, you only need to set your PostgreSQL and Redis connection URLs. Most of the other configuration settings have [sensible defaults](/advanced/configuration/reference) that you can leave as-is until you need to change them.
```bash blnk.env theme={"system"}
# Database configuration
BLNK_DATA_SOURCE_DNS="postgres://postgres:password@postgres:5432/blnk?sslmode=disable"
# Redis configuration
BLNK_REDIS_DNS="redis:6379"
```
```json blnk.json theme={"system"}
{
"data_source": {
"dns": "postgres://postgres:password@postgres:5432/blnk?sslmode=disable"
},
"redis": {
"dns": "redis:6379"
}
}
```
***
## Need help?
We are very happy to help you make the most of Blnk, regardless of whether it is your first time or you are switching from another tool.
To ask questions or discuss issues, please [contact us](mailto:support@blnkfinance.com) or [join our Discord community](https://discord.gg/7WNv94zPpx).
Sign up and manage your ledger with our back-office dashboard. You can invite teammates to collaborate and manage your ledger operations directly from the dashboard.