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Overview
What is NATS
Subject-Based Messaging
Core NATS
JetStream
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NATS Service Infrastructure
Security
Connectivity
Using NATS
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Developing With NATS
Running a NATS service
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NATS Server Clients
Configuring NATS Server
Managing and Monitoring your NATS Server Infrastructure
Reference
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NATS Protocols
Legacy
STAN aka 'NATS Streaming'
nats-account-server
Basics
Inspecting JWTs
Directory Store
Update Notifications
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nats-account-server
If you are creating a new NATS deployment we highly recommend using the internal NATS Resolver for a much simpler and easy to manage account resolution system.
This account server, while being considered legacy, is still functional and still serves as a good reference to build upon for custom account resolution

nats-account-server

The standalone NATS Account Server is an HTTP server that hosts and vends JWTs for nats-server 2.0 account authentication. The server supports an number of stores which enable it to serve account JWTs from a directory​
While the nats servers can be still configured to use a standalone NATS Account Server, this functionality is now deprecated and it is recommended that the servers should now be configured to use the built-in full NATS based resolver instead.
The standalone NATS Account Server also speaks the full nats based resolver protocol and can be used as such.
The server can operate in a READ ONLY mode where it serves content from a directory, or in notification mode, where it can notify a NATS server that a JWT in the store has been modified, updating the NATS server with the updated JWT.
The server supports replica mode, which allows load balancing, fault tolerance and geographic distribution of servers. Replicas are read-only and copy JWTs from the primary based on cache invalidation or NATS notifications.
The account server can host activation tokens as well as account JWTs. These tokens are used when one account needs to give permission to another account to access a private export. Tokens can be configured as full tokens, or URLs. By hosting them in the account server you can avoid the copy/paste process of embedding tokens. They can also be updated more easily on expiration. The account serer furthermore allows for jwt inspection.
All account server configuration options can be found here. It futhermore allows inspection of JWT.
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nats-account-server