Speed · tinyaml

Times faster than the original, 268 KiB file

Median time per call over 7 rounds, from bench/index.ts, on an Apple M4 with Node 26.13. Each library and the tinyaml entry that replaces it run with default options. The inputs are a 7-line frontmatter block and js-yaml's package-lock.json written as YAML, 268 KiB. The last four rows compare tinyaml's root API with yaml, the library closest to its rules.

All timings

Section titled "All timings"

Library	Operation	Library	tinyaml	Speedup
js-yaml 4	parse frontmatter	2.7 µs	1.7 µs	1.6x
js-yaml 4	stringify frontmatter	3.7 µs	2.5 µs	1.5x
js-yaml 4	parse 268 KiB	3.00 ms	2.00 ms	1.5x
js-yaml 4	stringify 268 KiB	4.51 ms	2.77 ms	1.6x
js-yaml 5	parse frontmatter	3.1 µs	1.7 µs	1.8x
js-yaml 5	stringify frontmatter	5.3 µs	2.7 µs	2.0x
js-yaml 5	parse 268 KiB	3.07 ms	2.00 ms	1.5x
js-yaml 5	stringify 268 KiB	5.22 ms	2.90 ms	1.8x
yaml	parse frontmatter	29.6 µs	2.8 µs	10.6x
yaml	stringify frontmatter	13.7 µs	4.2 µs	3.3x
yaml	parse 268 KiB	35.89 ms	2.85 ms	12.6x
yaml	stringify 268 KiB	11.93 ms	4.22 ms	2.8x
yamljs	parse frontmatter	7.1 µs	2.0 µs	3.5x
yamljs	stringify frontmatter	1.6 µs	1.1 µs	1.4x
yamljs	parse 268 KiB	11.36 ms	2.29 ms	5.0x
yamljs	stringify 268 KiB	1.46 ms	1.28 ms	1.1x
@std/yaml	parse frontmatter	3.7 µs	1.7 µs	2.1x
@std/yaml	stringify frontmatter	3.8 µs	2.3 µs	1.7x
@std/yaml	parse 268 KiB	4.03 ms	2.03 ms	2.0x
@std/yaml	stringify 268 KiB	4.10 ms	2.56 ms	1.6x
yaml, root	parse frontmatter	30.4 µs	1.6 µs	19.4x
yaml, root	stringify frontmatter	14.1 µs	1.1 µs	13.2x
yaml, root	parse 268 KiB	36.22 ms	1.87 ms	19.3x
yaml, root	stringify 268 KiB	12.65 ms	1.01 ms	12.5x

tinyaml is faster on every row. The closest is tinyaml/yamljs's stringify on the 268 KiB file, 1.28 ms to yamljs's 1.46 ms. It has to write the same bytes as yamljs, so it follows yamljs's dumper closely.