LEGACY MODERNIZATION

You need to break up the monolith.

Planning to decompose a monolith or modernize a legacy system? See the real module boundaries and every inbound and outbound integration first, so you cut along seams that already exist.

Analyze my codebase →See the API Flow
mapnostics.com/repo/acme-platform/api-flow
API Flow

Inbound and outbound integrations, and the data crossing each boundary

An arrow means one component calls another. It does not mean one runs first. A call to our own endpoint is drawn as an arrow into that endpoint, not as a service.

All integrations
Inbound from
API clients
12 callsopen →
Inbound from
Stripe
3 callsopen →
Our endpoint
/api/orders
2 endpointsdrill in →
app/api/orders/route.ts
Our endpoint
/api/checkout
1 endpointdrill in →
app/api/checkout/route.ts
Our endpoint
/api/webhooks/stripe
1 endpointdrill in →
app/api/webhooks/stripe/route.ts
Our module
orders/repository.ts
9 callsopen →
lib/orders/repository.ts
Outbound to
api.stripe.com
6 callsopen →
Outbound · URL not static
Runtime-built URL
2 callsopen →
Inbound fromOur endpointOur moduleOutbound toURL not static
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Cut along seams that already exist

The dependency graph shows which files cluster together and which are high-traffic nodes, so a service boundary follows the structure the code has instead of one drawn on a whiteboard.

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Every integration in and out

API Flow maps inbound callers and outbound services for each route and module, and flags the calls whose target URL is built at runtime — the ones a migration breaks silently.

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Know the blast radius before you move a module

Trace every dependent file, route and page a change touches, so a step in the decomposition does not regress a part of the monolith you were not looking at.

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The Code Map carries the dependency graph these boundaries come from. If the monolith is also mostly AI-generated, see AI code sprawl.

Map your decomposition seams in under 2 minutes.

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