What log formats are supported?

The tool supports JSON lines with source/target fields, arrow-style logs (e.g., api -> auth), and trace-style text logs.

Can I limit the size of the generated diagram?

Yes, you can set a 'Max Steps' limit (between 3 and 40) to compress the output and ensure the sequence diagram remains readable.

How are errors displayed in the diagram?

If you enable 'Highlight Errors', the tool annotates failing steps with specific error notes directly on the sequence diagram.

Does it support PlantUML?

Yes, you can choose between Mermaid and PlantUML as your output diagram format.

Can I upload a log file instead of pasting text?

Yes, you can upload .log, .txt, .json, or .jsonl files up to 20MB.

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Log Sequence Diagram Converter

Convert structured service logs into Mermaid or PlantUML sequence diagrams, with optional latency and error annotations

Details

What this tool helps you do

Paste JSON lines or trace-style text logs, or upload a log file. The tool first parses interaction-like events such as serviceA -> serviceB or structured JSON with source / target / action fields, then generates a sequence diagram in Mermaid or PlantUML.

How to use it:

Log Input / Log File: provide logs that contain cross-service interaction hints
Diagram Format: choose Mermaid or PlantUML
Include Latency Notes: adds per-step latency markers where available
Highlight Errors: annotates failing steps with error notes
Max Steps: compresses the output so the diagram stays readable

Supported patterns:

JSON lines with fields like source, target, action, status, latencyMs, error
arrow logs such as api -> auth POST /login | status=401 | latency=82ms
trace-style lines such as [api] GET /users -> [db] 200 14ms

Output:

compact interaction summary
Mermaid or PlantUML sequence diagram source
AI-assisted summarization when possible, with heuristic fallback when AI is unavailable

Execution

Run this tool

Fill in the form, run the tool, and review the result in one place.

Prepared example runs

Click an example to fill the form automatically. File inputs still need an upload.

1 examples

Turn a microservice login trace into a Mermaid sequence diagram

Summarize a login failure path with service hops, latency notes, and the failing auth step highlighted in the resulting diagram.

Summary - Title: Service interaction trace Diagram ```mermaid sequenceDiagram participant api ...```

Inputs

Set the required fields, then run the tool.

6 options

FilesUpload source files for this workflow.1

Log FilefileOptional

Single file max size: 20 MBSupported types: application/json, text/plain, text/log, .log, .txt, .jsonl

ContentPaste or type the main input values.1

Log InputtextareaOptional

SettingsAdjust formats, ranges, numbers, and modes.2

Diagram FormatselectOptionalMax StepsnumberOptional

TogglesEnable or disable optional behavior.2

Include Latency NotescheckboxOptionalEnabled when checkedHighlight ErrorscheckboxOptionalEnabled when checked

Result

Ready for a run

Run the tool to preview files, text, structured data, or streamed output here.

Samples

Log Sequence Diagram Converter

What this tool helps you do

Run this tool

Prepared example runs

Inputs

Result

Examples that match this tool

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Prepared example runs

Inputs

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Key facts

Overview

When to use

How it works

Use cases

Examples

1. Visualizing a Microservice Login Trace

2. Generating PlantUML from JSON Lines

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