Hello,

I am experiencing an issue with one of my Railway services.

Context

Project: 74ddf14f-384e-431a-9822-a217784a4358

Neo4j service: d2b6d126-e771-49e7-99e1-61dbceb48ab0

Template used: Neo4J | Open Source Graph Database (or similar)

Issue

My backend crashes immediately with the following error:

Code

Error: Unknown scheme: null

at neo4j-driver/lib/index.js:204

This indicates that neo4j-driver is not receiving any valid URL in process.env.NEO4J_URI.

Observations

In the Neo4j service variables:

I see DB_PASSWORD, HEAP_*, NEO4J_PLUGINS, etc.

But no variable such as NEO4J_URI, BOLT_URL, NEO4J_USERNAME, etc.

The “13 variables added by Railway” only contain system-level variables (RAILWAY_PRIVATE_DOMAIN, RAILWAY_TCP_PROXY_DOMAIN, etc.)

The template exposes only a TCP proxy, but no Bolt URI usable by neo4j-driver.

Questions

Could you please clarify:

Whether this Neo4j template is supposed to generate a Bolt URI compatible with neo4j-driver

If yes, where this variable can be found (it does not appear in the UI)

If not, which official Neo4j template you recommend to obtain a working Bolt endpoint for a Node.js service on Railway

Whether the Railway TCP proxy is compatible with the Bolt protocol

Thank you in advance for your help.

I can provide additional logs if needed.

Best regards,

Philippe