Topic Filters · Free Local Tool

Mqtt Topic Matcher

Create a Topic/Filter hit matrix based on MQTT's single-layer and multi-layer wildcard rules and check for invalid filters.

No uploadsMobile-friendlyTheme support

What is the MQTT Topic pairing tester?

Create a Topic/Filter hit matrix based on MQTT's single-layer and multi-layer wildcard rules and check for invalid filters. ToolHub places the core computing entirely within the browser, allowing immediate use on both desktop and mobile devices, without the need to register an account or send content to the backend.

How to use this tool?

  1. Enter the data according to the field prompts and select the required processing method.
  2. Click "Process Now" to view the results, indicator summary and necessary error messages.
  3. After confirming that the content meets actual needs, you can copy the results or download them into files for further use.

Suitable use cases

IoT Topic design, Broker ACL, subscription debugging and test cases. All processing is completed in the current page, which is especially suitable for workflows that do not want to post internal data to remote services.

Interpretation of results and precautions

The shared subscription and Broker expansion behaviors may be different, and the official results are still subject to the target Broker. Tools will validate basic input formats and provide readable error messages, but production environments should still be reconfirmed against source specifications, business rules, or professional requirements.

Browser and device support

Mqtt Topic Matcher supports current Chrome, Edge, Firefox, and Safari releases. Mobile and desktop layouts use the same validation rules documented on this page.

Frequently Asked Questions

Will the MQTT Topic pairing tester upload data to the server?
No. Tool functions are executed directly within the current browser tab, and input and generated results will not be uploaded or saved by ToolHub.
What usage scenarios is the MQTT Topic pairing tester suitable for?
IoT Topic design, Broker ACL, subscription debugging and test cases
Do I need to install software before using the MQTT Topic pairing tester?
No need. Use a desktop or mobile browser that supports modern JavaScript, and no account is required.
What are the limitations of this tool?
Shared subscription and Broker expansion behaviors may be different, and the official results are still subject to the target Broker.
Is manual inspection required after the results are generated?
Needed. Tools can assist with calculations, conversions, or formatting, but before going online, importing data, or making business decisions, the results should still be reviewed according to actual specifications.

Mqtt Topic Matcher: inputs, output, and reproducible example

Use the free Mqtt Topic Matcher online. Fast, private, mobile-friendly, and processed directly in your browser.

What this page actually processes

FieldControlDefault exampleValidation role
Topic FiltersMultiline textsensors/+/temperature devices/# $share/workers/jobs/+ alerts/criticalTopic Filters is read by the browser as a multiline text value before the tool runs.
TopicsMultiline textsensors/taipei/temperature sensors/taipei/humidity devices/a/status jobs/render alerts/criticalTopics is read by the browser as a multiline text value before the tool runs.

Reproduce the built-in example

Start with Topic Filters = sensors/+/temperature devices/# $share/workers/jobs/+ alerts/critical; Topics = sensors/taipei/temperature sensors/taipei/humidity devices/a/status jobs/render alerts/critical, then run Mqtt Topic Matcher. Change one input at a time so the effect on the result remains traceable.

After validating topic filters, topics, the page displays its result in the output workspace and enables the relevant copy or download action.

When to use it and how to interpret the result

IoT Topic design, Broker ACL, subscription debugging and test cases. All processing is completed in the current page, which is especially suitable for workflows that do not want to post internal data to remote services.

Limits and checks before use

The shared subscription and Broker expansion behaviors may be different, and the official results are still subject to the target Broker. Tools will validate basic input formats and provide readable error messages, but production environments should still be reconfirmed against source specifications, business rules, or professional requirements.

Page verification record

Controls inspected2 documented inputsResult pathValidate → process → review → copy/downloadLast content review2026-09-02