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+---
+title: Diag WG Update - Many new tools, phasing out some old ones
+author: Josh Gavant (@joshgav)
+date: 2017-02-28T08:00:00.000Z
+category: wg
+status: publish
+slug: diag-wg-update-2017-02
+layout: blog-post.hbs
+---
+
+In surveys and discussions with Node.js users we consistently hear of your need
+for better tools and APIs for debugging and understanding your modules and apps.
+In fact, in last year's [Node.js Foundation survey][], the biggest ask from
+developers and technical leads was for better tools.
+
+[Node.js Foundation survey]: https://nodejs.org/static/documents/2016-survey-report.pdf
+
+Based on that feedback and thanks to contributions and collaboration from across
+our community, over the past year several experimental diagnostic APIs and tools
+have landed in Node itself and the Node.js Foundation, including:
+
+* [async_hooks][] for sharing context across async boundaries
+* [Inspector][] and [node-inspect][] for stepping and profiling 
+* [Trace Controller][] for gathering and streaming traces from V8 and Node
+* [node-report][] and [llnode][] for post-mortem analysis
+
+[async_hooks]: https://github.com/nodejs/node/pull/8531
+[Inspector]: https://github.com/nodejs/node/issues?utf8=%E2%9C%93&q=label%3Ainspector%20
+[node-inspect]: https://github.com/nodejs/node-inspect
+[Trace Controller]: https://github.com/nodejs/node/pull/9304
+[node-report]: https://github.com/nodejs/node-report
+[llnode]: https://github.com/nodejs/llnode
+
+Over the coming months we'll continue to improve the [stability][] of these projects
+and hope to eventually graduate some from experimental state with your help and
+feedback. Search the nodejs GitHub org for labels [diag-agenda][],
+[tracing][], and [inspector][] and review issues in the [Diagnostics WG][] to
+see what we're working on and how you can help.
+
+[stability]: https://nodejs.org/dist/latest-v7.x/docs/api/documentation.html#documentation_stability_index
+[diag-agenda]: https://github.com/search?q=org%3Anodejs+label%3A%22diag-agenda%22&type=Issues
+[tracing]: https://github.com/search?utf8=✓&q=org%3Anodejs+label%3A"tracing"+is%3Aopen&type=Issues
+[inspector]: https://github.com/search?utf8=✓&q=org%3Anodejs+label%3A"inspector"+is%3Aopen&type=Issues
+[Diagnostics WG]: https://github.com/nodejs/diagnostics/issues
+
+## Inspector replaces legacy V8 Debugger
+
+With progress comes the need to phase out old implementations so we can focus on
+refining and completing new ones to meet user needs. In particular, as Inspector
+[graduates from experimental status](https://github.com/nodejs/node/issues/11421)
+in the coming months, V8 and Node's legacy Debugger API will be
+[deprecated](https://github.com/nodejs/node/pull/10970) and eventually
+[removed](https://github.com/nodejs/node/issues/9789) in favor of the new
+Inspector API.
+
+Considering the relative imminence of this change, we've decided to add a deprecation
+warning as soon as possible to prepare users of the legacy interface. So beginning
+in Node 7.7.0 **running `node --debug`** (or variants like `--debug-brk` and
+`--debug-port=12345`) **will print a deprecation warning** to stderr. To avoid
+this message, start node with the `--no-deprecation` flag.
+
+For your future debugging needs, use `node --inspect` or variants like `--inspect-brk`
+to activate the new [Inspector API][]. Many popular editors and tools already
+automatically support this API with Node.js 6 and later.
+
+In addition, Node's built-in [CLI debugger][], typically invoked with `node
+debug myscript.js`, has now (7.6.0+) been augmented with an Inspector-based
+equivalent invoked with `node inspect myscript.js`. `node debug myscript.js` will
+eventually be removed as well in favor of `node inspect`.
+
+[Inspector API]: https://chromedevtools.github.io/debugger-protocol-viewer/v8/
+[CLI debugger]: https://nodejs.org/docs/v7.6.0/api/debugger.html
+
+## Try it!
+
+Check out the [Debugging - Getting Started][] guide for help getting started
+with `--inspect` and Inspector.
+
+As always, but particularly in this transition stage, we'd love your feedback
+both on the insights you need from the Node.js runtime and modules, as well as
+your experiences getting that info with tools and APIs old and new. [Open an
+issue][] in the Diagnostics WG for discussions or a PR in [nodejs/node][] to
+contribute code.
+
+[Debugging - Getting Started]: http://nodejs.org/en/docs/guides/debugging_getting_started
+[Open an issue]: https://github.com/nodejs/diagnostics/issues/new
+[nodejs/node]: https://github.com/nodejs/node
+
+Thank you!