https://github.com/softwaremill/otterjet

Visualization of messages from a NATS JetStream server
https://github.com/softwaremill/otterjet

java java17 nats nats-jetstream nats-messaging nats-server nats-streaming

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Visualization of messages from a NATS JetStream server

• Host: GitHub
• URL: https://github.com/softwaremill/otterjet
• Owner: softwaremill
• License: apache-2.0
• Created: 2023-11-27T10:59:21.000Z (over 1 year ago)
• Default Branch: master
• Last Pushed: 2025-01-25T20:48:09.000Z (5 months ago)
• Last Synced: 2025-03-30T15:47:00.380Z (2 months ago)
• Topics: java, java17, nats, nats-jetstream, nats-messaging, nats-server, nats-streaming
• Language: Java
• Homepage: https://softwaremill.com/introduction-to-otterjet/
• Size: 1.44 MB
• Stars: 36
• Watchers: 15
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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# Welcome!

[![CI](https://github.com/softwaremill/otterJet/workflows/CI/badge.svg)](https://github.com/softwaremill/otterJet/actions?query=workflow%3A%22CI%22)

# OtterJet

OtterJet is a project designed to provide a visualization of messages from a NATS JetStream server. Offering a WEB interface for interacting with NATS JetStream servers.

This project is particularly useful for developers who need to monitor traffic during development.

## Prerequisites

- Java 17 or higher

- NATS JetStream server

## Features

- Reads messages from a NATS JetStream server.

- Deserializes messages based on the specified mode (protobuf or plaintext for now).

- Filters messages based on subject, type, and body content.

- Displays monitoring information in a web interface.

## Setup

1. Clone the repository.

2. Navigate to the project directory.

3. Run `mvn clean install` to build the project.

4. Configure your NATS JetStream server details in the `application.properties` file.

## Configuration

The following properties need to be set in the `application.properties` file:

- `read.mode`: The mode to use for deserialization (either `proto`, `plaintext` or `avro`).

- `read.subject`: The subject to read messages from.

- `read.proto.pathToDescriptor`: The path to the protobuf descriptor file (only required if `read.mode` is set to `proto`).

- `read.avro.pathToSchema`: The path to the avro schema (only required if `read.mode` is set to `avro`).

- `read.store.limit`: The maximum number of messages to store in memory. Default - 10000

- `read.startDate`: Optional date from which to start reading messages.

## Usage

After building the project, you can run it using the command `mvn spring-boot:run`.

## Web Interface

### Messages page

![MessagesPage](docs/images/messages-page.png)

### Monitoring page

![MonitoringPage](docs/images/monitoring-page.png)

## Troubleshooting

If you encounter any issues while setting up or running the project, please check the following:

- Ensure that your NATS JetStream server is running and accessible.

- Verify that the configuration properties in the `application.properties` file are correct.

## Contributing

All suggestions are welcome :)

## Copyright

Copyright (C) 2023-2024 SoftwareMill [https://softwaremill.com](https://softwaremill.com).