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Multiline Log Event Stitcher

Reassemble stack traces and wrapped log lines into complete events, preserving source line ranges and exporting structured JSONL.

Event boundariesEditable projectsLocal processing

Source → inspect → export

Open project

Preparing the worked example…

Your source & settings

Settings & options

Open your media file

Files stay in your browser. Try the built-in sample first.

Choose file

Source text is limited to 1.5 million characters per editor; imported text files are limited to 1.5 MB.

Inspect your result

PREVIEW & EXPORT

Output file

Know what changed

The regular expression identifies event starts only. Leading unmatched lines form a separate preamble event. Processing is bounded by the worker timeout; no log code is executed.

Choose another output above or open Export files.

Explore the example

Reassemble stack traces and wrapped log lines into complete events, preserving source line ranges and exporting structured JSONL.

What you can inspect

Event boundaries — Event, First, Last, Preamble, Preview.

Keep the result you need

Use the output selector to inspect each generated file, then download it. Save a project to keep source inputs and settings together. Result files and editable projects serve different purposes.

Processing & file support

Source text is limited to 1.5 million characters per editor; imported text files are limited to 1.5 MB.

Your working session

Processing runs locally in a worker with a 30-second cancellation limit. Undo and redo keep up to 20 edits in this tab. Project files include imported assets and are limited to 40 MiB. There is no automatic saving.

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Using Multiline Log Event Stitcher

Reassemble stack traces and wrapped log lines into complete events, preserving source line ranges and exporting structured JSONL.

Start with the worked example in log text, then paste your own source or open a text file.
Adjust new-event start regex, trim continuation indentation. Change one setting at a time so you can understand its effect.
Choose “Process source”. Inspect the event boundaries before using the result.
Download the selected output, inspect other files in Export files and save a project if you want to reopen the same inputs.

Example

Try the built-in example, inspect event boundaries and compare the result after changing one option.

Questions & answers

What does Multiline Log Event Stitcher do?

Reassemble stack traces and wrapped log lines into complete events, preserving source line ranges and exporting structured JSONL.

What are the important limitations?

The regular expression identifies event starts only. Leading unmatched lines form a separate preamble event. Processing is bounded by the worker timeout; no log code is executed.

Can I save and reopen my work?

Yes. Save a project JSON file containing your inputs, settings and any imported assets. Projects are limited to 40 MiB. Undo/redo stores up to 20 edits in this session and is not saved in the project. There is no automatic saving.

How do imports and output previews work?

Source text is limited to 1.5 million characters per editor; imported text files are limited to 1.5 MB. Text previews show up to 150,000 characters; downloads include the complete output. Tables show 50 rows per page; CSV files include all rows.