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Free online JavaScript benchmark builder for measuring code execution time. Test and compare performance of different code snippets accurately.
Warning: This tool executes arbitrary JavaScript code using the Function constructor. Only run code you trust.
Benchmarks run in the browser and results may vary based on system load and browser optimizations.
Benchmark JavaScript code execution time by running a code snippet N times (configurable from 1 to 10,000 iterations). Reports total time, average time, min/max time, and operations per second using performance.now() for high-precision timing.
Comparing the performance of different code approaches requires accurate timing measurement; this tool provides a quick way to benchmark code snippets without setting up a full test framework.
JavaScript developers optimizing performance-critical code, educators teaching algorithm complexity, and anyone who needs to measure code execution time accurately.
Write or paste JavaScript code in the function body textarea
Use 'return' to return a value from the benchmarked code
Select the number of iterations (1, 10, 100, 1K, or 10K)
Click Run Benchmark to execute the code the specified number of times
Review the results: total time, average, min, max, and ops/sec
Click a quick example button to load a pre-written benchmark
Array.sort vs manual sort algorithm on a 1000-element arrayString concatenation with += vs array joinJSON.parse/stringify vs manual object cloningMath.sqrt vs manual square root approximationBrowser JIT compilation optimizes code over time. Run multiple benchmarks and look at the average for stable results.
The code runs in the browser sandbox via the Function constructor. It cannot access files or system resources, but it can consume CPU and memory.
Operations per second is the inverse of average time: 1000 / avgTime(ms). Higher is better.
This tool benchmarks synchronous code only. For async benchmarks, you would need a custom setup with await.
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