err

Pipe your build/test commands to err and see only the errors you need to fix.

No timestamps. No noise. Just the error.

Installation

Homebrew

brew install XD637/err/err

Go

go install github.com/XD637/err@latest

From Source

git clone https://github.com/XD637/err.git
cd err
go build

Usage

# Pipe from commands
npm test 2>&1 | err
python script.py 2>&1 | err
go build 2>&1 | err
cargo build 2>&1 | err

# From file
err error.log

# Verbose output
err -v error.log

Examples

TypeScript Error

Before:

src/index.ts:42:5 - error TS2322: Type 'string' is not assignable to type 'number'.

42     const count: number = "hello";
       ~~~~~

Found 1 error in src/index.ts:42

After:

TS2322: Type 'string' is not assignable to type 'number'.

Rust Error

Before:

error[E0382]: borrow of moved value: `s`
  --> src/main.rs:5:20
   |
3  |     let s = String::from("hello");
   |         - move occurs because `s` has type `String`
4  |     let t = s;
   |             - value moved here
5  |     println!("{}", s);
   |                    ^ value borrowed here after move

After:

E0382: borrow of moved value: `s`
  src/main.rs:5:20

Go Build Error

Before:

# github.com/user/myapp
./main.go:15:2: undefined: fmt.Printl
./main.go:20:15: cannot use "hello" (type untyped string) as type int in assignment
./utils.go:42:9: undefined: helper

After:

build error: undefined: fmt.Printl
  ./main.go:15:2
  ./main.go:20:15
  ./utils.go:42:9

Python Error

Before:

Traceback (most recent call last):
  File "/home/user/projects/app/main.py", line 42, in <module>
    result = process_data(None)
  File "/home/user/projects/app/utils.py", line 15, in process_data
    return data.strip()
AttributeError: 'NoneType' object has no attribute 'strip'

After:

AttributeError: 'NoneType' object has no attribute 'strip'
  File "main.py", line 42, in <module>
  File "utils.py", line 15, in process_data

npm Error

Before:

npm ERR! code ENOENT
npm ERR! syscall open
npm ERR! path /home/user/project/package.json
npm ERR! errno -2
npm ERR! enoent ENOENT: no such file or directory, open '/home/user/project/package.json'
npm ERR! enoent This is related to npm not being able to find a file.

After:

npm ENOENT: enoent ENOENT: no such file or directory, open 'package.json'

Supported Languages

• JavaScript/Node.js/TypeScript - Standard errors, TypeScript compile errors, npm errors, unhandled promise rejections
• Python - Exceptions, tracebacks, syntax errors, import errors
• Go - Panics, build errors, test failures, fatal errors
• Rust - Compile errors, panics, backtraces (focuses on errors, ignores warnings)

What It Does

• Extracts error type and message
• Removes timestamps, memory addresses, UUIDs, hex values
• Simplifies file paths to filenames
• Filters relevant stack frames
• Deduplicates repeated frames
• Removes language-specific internals

Options

-format string
    Error format: auto, javascript, python, go, rust
    Default: auto

-v  Verbose output

-version
    Print version

-help
    Print help

License

MIT