All tools › What a machine wrote
Log file parser
Splits lines into fields, filters them, and counts what happened most.
It runs entirely in this browser tab: the documents you paste are never uploaded, and the tool makes no network request while it works. Open your browser's network panel and try it — nothing leaves the page.
Settings
- Show
- What comes out: the same answer in another shape. Choices: Work it out, ISO 8601, Bracketed, syslog, Common log, Combined, My own pattern.
- Line pattern
- Put a name in braces where a field goes: `{{time}} {{level}} {{message}}`.
- Only this level
- `error`, `warn`, `info` — however the file spells it.
- Contains
- Plain text, matched anywhere in the line.
- Write it as
- The same table in another notation. Choices: Fields, Counts.
How to use it
- Paste your text into the box above, or open a file.
- Adjust the settings beside it until the result is what you wanted.
- Copy the result, or save it as a file. The result updates as you type.
Questions
- Is what I paste uploaded anywhere?
- No. The whole tool is carried as WebAssembly and runs on your own device. That is the point of the group: the files these tools are for are exactly the ones you would not paste into somebody else's server.
- How big a file can it take?
- About a megabyte, and it says so rather than truncating quietly. Past that you are handing it a database rather than a document, and the input here is a text area — the editing view is capped at forty thousand characters and says so, though the tool still reads all of what you gave it.
- Why does it say it guessed?
- Because it did. Which format a document is, which delimiter a table uses and whether the first row is a header are all decided by looking at the text. Each guess is right almost always and each is printed on the result, because a converter that guessed silently and got it wrong would eat a file.
- Does it change my numbers?
- No. A number keeps the text it was written as, all the way through: `1.0` stays `1.0` and a thirty-digit identifier stays thirty digits. Nothing here is ever a floating-point value, which is why a sorted document differs from the original only where you asked it to.
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