stacktrace.js v2.0 is out, featuring ES6 support, better stack frames, and more!
The identifier iosxrvk9demo613qcow2 refers to a specific virtual machine image for Cisco IOS XRv 9000 (version 6.1.3) formatted for use with QEMU/KVM (QCOW2 format).
Here are the detailed features and specifications of this platform:
Breakdown of the string:
iosxrv → Cisco IOS XRv (a virtualized version of the Cisco IOS XR operating system, typically used for service provider routing).
k9 → Indicates crypto / security features (supports SSH, encryption).
demo → Likely a demonstration or limited-use image.
613 → Possibly a version or build number (e.g., 6.1.3?).
qcow2 → QEMU Copy-On-Write version 2 disk image format.
Breaking Down the Filename
Let’s analyze iosxrvk9demo613qcow2:
| Part | Meaning |
|------|---------|
| iosxrv | Cisco IOS XRv (virtual version of ASR 9000 series) |
| k9 | Indicates cryptographic (encryption) support – typical for export-controlled versions |
| demo | Likely indicates a demo, evaluation, or trial image |
| 613 | Possibly a build number, date stamp, or arbitrary lab identifier |
| qcow2 | QEMU Copy-On-Write version 2 – a disk format used by KVM, Proxmox, and other open-source hypervisors |
The string resembles a custom-named file from an internal lab or a repackaged unofficial image. Cisco’s official images follow a more structured naming convention like iosxrv-fullk9-x-6.3.2.qcow2.
In version 1.x, We've switched from a synchronous API to an asynchronous one using Promises because synchronous ajax calls are deprecated and frowned upon due to performance implications.
All methods now return stackframes. This Object representation is modeled closely after StackFrame representations in Gecko and V8. All you have to do to get stacktrace.js v0.x behavior is call .toString() on a stackframe.
Use Case: Give me a trace from wherever I am right now
var error = new Error('Boom');
printStackTrace({e: error});
==> Array[String]
v1.x:
var error = new Error('Boom');
StackTrace.fromError(error).then(callback).catch(errback);
==> Promise(Array[StackFrame], Error);
If this is all you need, you don't even need the full stacktrace.js library! Just use error-stack-parser!
ErrorStackParser.parse(new Error('boom'));
Use Case: Give me a trace anytime this function is called
Instrumenting now takes Function references instead of Strings.
v0.x:
function interestingFn() {...};
var p = new printStackTrace.implementation();
p.instrumentFunction(this, 'interestingFn', logStackTrace);
==> Function (instrumented)
p.deinstrumentFunction(this, 'interestingFn');
==> Function (original)
v1.x:
function interestingFn() {...};
StackTrace.instrument(interestingFn, callback, errback);
==> Function (instrumented)
StackTrace.deinstrument(interestingFn);
==> Function (original)
Iosxrvk9demo613qcow2 Hot! 90%
.parseError()
Error: Error message
at baz (http://url.com/file.js:10:7)
at bar (http://url.com/file.js:7:17)
at foo (http://url.com/file.js:4:17)
at http://url.com/file.js:13:21
Parsed Error
.get()
function foo() {
console.log('foo');
bar();
}
function bar() {
baz();
}
function baz() {
function showTrace(stack) {
var event = new CustomEvent('st:try-show', {detail: stack});
document.body.dispatchEvent(event);
}
function showError(error) {
var event = new CustomEvent('st:try-error', {detail: error});
document.body.dispatchEvent(event);
}
StackTrace.get()
.then(showTrace)
.catch(showError);
}
foo();
StackTrace output
Iosxrvk9demo613qcow2 Hot! 90%
The identifier iosxrvk9demo613qcow2 refers to a specific virtual machine image for Cisco IOS XRv 9000 (version 6.1.3) formatted for use with QEMU/KVM (QCOW2 format).
Here are the detailed features and specifications of this platform:
Breakdown of the string:
iosxrv → Cisco IOS XRv (a virtualized version of the Cisco IOS XR operating system, typically used for service provider routing).
k9 → Indicates crypto / security features (supports SSH, encryption).
demo → Likely a demonstration or limited-use image.
613 → Possibly a version or build number (e.g., 6.1.3?).
qcow2 → QEMU Copy-On-Write version 2 disk image format.
Breaking Down the Filename
Let’s analyze iosxrvk9demo613qcow2:
| Part | Meaning |
|------|---------|
| iosxrv | Cisco IOS XRv (virtual version of ASR 9000 series) |
| k9 | Indicates cryptographic (encryption) support – typical for export-controlled versions |
| demo | Likely indicates a demo, evaluation, or trial image |
| 613 | Possibly a build number, date stamp, or arbitrary lab identifier |
| qcow2 | QEMU Copy-On-Write version 2 – a disk format used by KVM, Proxmox, and other open-source hypervisors |
The string resembles a custom-named file from an internal lab or a repackaged unofficial image. Cisco’s official images follow a more structured naming convention like iosxrv-fullk9-x-6.3.2.qcow2.
Not Your Average Router VM
It’s important to know what this image is not:
Not for production – Data plane throughput is minimal; it’s a control‑plane emulator, not a high‑performance packet forwarder.
Not feature‑complete – Some ASIC‑dependent features (like certain QoS or hardware offloads) are absent.
Not officially supported – This image circulates in labs and training; official IOS XRv 9000 requires a Cisco support contract.
Iosxrvk9demo613qcow2 Hot! 90%
Turn partial code location into precise code location
This library accepts a code location (in the form of a StackFrame) and returns a new StackFrame with a more accurate location (using source maps) and guessed function names.
Usage
var stackframe = new StackFrame({fileName: 'http://localhost:3000/file.min.js', lineNumber: 1, columnNumber: 3284});
var callback = function myCallback(foundFunctionName) { console.log(foundFunctionName); };
// Such meta. Wow
var errback = function myErrback(error) { console.log(StackTrace.fromError(error)); };
var gps = new StackTraceGPS();
// Pinpoint actual function name and source-mapped location
gps.pinpoint(stackframe).then(callback, errback);
//===> Promise(StackFrame({functionName: 'fun', fileName: 'file.js', lineNumber: 203, columnNumber: 9}), Error)
// Better location/name information from source maps
gps.getMappedLocation(stackframe).then(callback, errback);
//===> Promise(StackFrame({fileName: 'file.js', lineNumber: 203, columnNumber: 9}), Error)
// Get function name from location information
gps.findFunctionName(stackframe).then(callback, errback);
//===> Promise(StackFrame({functionName: 'fun', fileName: 'http://localhost:3000/file.min.js', lineNumber: 1, columnNumber: 3284}), Error)
Simple, cross-browser Error parser. This library parses and extracts function names, URLs, line numbers, and column numbers from the given Error's stack as an Array of StackFrames.
Once you have parsed out StackFrames, you can do much more interesting things. See stacktrace-gps.
Note that in IE9 and earlier, Error objects don't have enough information to extract much of anything. In IE 10, Errors are given a stack once they're thrown.