WebUtils
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Developer Workflow

Remove line numbers from stack traces

Clean stack traces, copied code blocks, and numbered log excerpts by removing line-start numbers while preserving real error lines and values.

Open Remove Line Numbers

Problem

Stack traces and copied code snippets often include visual line numbers that are not part of the real error. If those prefixes stay in the text, they make search, regex matching, issue comments, and AI prompts harder to read. Removing them with a broad number replacement can also damage ports, error codes, dates, and values that matter for debugging.

When to use this

  • A stack trace copied from an IDE, documentation page, or PDF includes numbers at the start of each line.
  • A code block needs to be pasted into a ticket, pull request, prompt, or chat without visual line numbers.
  • A log excerpt has repeated line-start indexes that interfere with regex testing or find-and-replace cleanup.
  • You need to keep real numbers such as status codes, ports, timestamps, versions, and column numbers inside the error text.

Steps

  1. Step 1

    Paste the full stack trace

    Keep the exception name, file paths, line starts, and surrounding log lines together. The repeated prefix pattern is easier to verify when the full copied block is present.

  2. Step 2

    Remove only line-start numbers

    Use Remove Line Numbers so the cleanup targets prefixes such as 12, 12:, 12., or 12) at the beginning of each line instead of removing every number in the trace.

  3. Step 3

    Check important numeric values

    Review ports, HTTP status codes, timestamps, version numbers, and stack trace line or column references after cleanup. Those values should remain in the body of each line.

  4. Step 4

    Test unusual formats with regex

    If the copied source uses custom prefixes, test a start-anchored pattern such as ^\s*\d+[:.)]?\s+ against a small sample before applying cleanup to the full block.

  5. Step 5

    Finish with targeted replacement

    After the line numbers are gone, use Text Find and Replace only for remaining repeated labels, file headers, or copied gutter markers that are not part of the error.

Example

Clean a stack trace copied with gutter numbers

Input

12 TypeError: Cannot read properties of undefined
13     at renderUser (/app/src/user.ts:42:15)
14     at async GET (/app/src/route.ts:18:7)

Output

TypeError: Cannot read properties of undefined
    at renderUser (/app/src/user.ts:42:15)
    at async GET (/app/src/route.ts:18:7)

Common mistakes

Deleting every number in the trace

Do not use a pattern that matches numbers anywhere in the text. Stack traces often contain meaningful line, column, status, and version numbers after the prefix.

Removing indentation before stack frames

Indentation can make stack frames easier to scan. Remove the visual line number prefix without flattening all whitespace unless the destination requires plain text.

Cleaning only the exception line

The repeated line-number format may change across wrapped stack frames. Paste enough context to confirm the pattern before using the cleaned trace in a ticket.

FAQ

Can this clean stack traces copied from an IDE?

Yes. It is designed for stack traces and code blocks where the copied text includes visual line numbers at the start of each line.

Will real stack trace line numbers be removed?

The workflow targets repeated prefixes at the start of each copied line. References inside file paths such as user.ts:42:15 should remain.

When should I use Regex Tester with this workflow?

Use Regex Tester when the source uses unusual prefixes, gutters, or mixed spacing and you want to verify a start-anchored cleanup pattern on a small sample first.