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nano-benchmark provides command-line utilities for micro-benchmarking code with nonparametric statistics and significance testing. Node, Deno and Bun are supported.

Two utilities are available:

• nano-watch — continuously benchmarks a single function, showing live statistics and memory usage.
• nano-bench — benchmarks and compares multiple functions, calculating confidence intervals and statistical significance.

Read the concepts page first for background on the approach.

Deno, Bun, etc.

Use --self to get the script path for running with alternative interpreters:

$ npx nano-bench benchmark.js
$ bun `npx nano-bench --self` benchmark.js
$ deno run --allow-read --allow-hrtime `npx nano-bench --self` benchmark.js
$ deno run -A `npx nano-bench --self` benchmark.js
$ node `npx nano-bench --self` benchmark.js