A CLI tool to capture CPU, memory, coverage, and other performance profiles for Node.js apps in Chrome DevTools format.
thetool is a CLI tool that captures CPU, memory, coverage, and other performance profiles from Node.js applications and outputs them in a Chrome DevTools-friendly format. It solves the problem of profiling Node.js apps in environments where Chrome DevTools cannot run directly, such as servers or headless setups, by allowing developers to capture data remotely and analyze it locally.
Node.js developers and DevOps engineers who need to profile and optimize the performance, memory usage, or code coverage of their applications, especially in server-side or CI/CD environments.
Developers choose thetool because it extends Chrome DevTools' profiling capabilities to any Node.js environment, supports child processes and workers, and offers a simple CLI with on-demand profiling, making it a versatile tool for performance analysis without requiring a browser.
thetool is a CLI tool to capture different cpu, memory and other profiles for your node app in Chrome DevTools friendly format
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Outputs data in Chrome DevTools format, allowing analysis with familiar tools, as stated: 'capture different cpu, memory and other profiles for your node app in Chrome DevTools friendly format.'
Supports CPU, memory sampling, allocation, heap snapshots, coverage, type profiling, and tracing, covering various performance aspects listed in the key features.
Enables profiling specific code sections using startTheTool/stopTheTool methods with the --ondemand flag, allowing targeted analysis without full app runs.
Can profile in environments where Chrome DevTools cannot run, such as servers, by capturing data remotely and analyzing locally, as highlighted in the 'Why not to use Chrome DevTools directly?' section.
The type profiler has 'no tool yet' for analysis, making it a half-baked feature that requires additional development to be useful.
Coverage reports require using the c8 tool for analysis, adding complexity and an extra dependency, as noted in the coverage profiler section.
Memory allocation profiling has 'much bigger overhead' compared to sampling, which can significantly impact application performance during profiling.