bench

Benchmark suites for comparing multiple implementations to copy JSON value in the following conditions.

• No circles exist in the values
• Only JSON-compatible values (null, number, string, boolean, array, object)

To run the benchmarks:

npm run bench

Benchmark suites

• LARGE: Large JSON value (1.2MB)
• MEDIUM: package.json of this package
• SMALL: Very small hand-made JSON object
• EMPTY: Empty object {}

Implementations

• Naive deep clone: Naive implementation of deep clone in a few lines
• JSON serialize/deserialize: JSON.parse(JSON.stringify(x))
• Native structuredClone: Native structuredClone function
• structuredClone polyfill: @ungap/structured-clone package
• lodash.clonedeep: lodash.clonedeep package
• clone-deep: clone-deep package
• rfdc (default): rfdc package with default options
• rfdc (proto): rfdc package with proto option enabled
• fastest-json-copy: fastest-json-copy package
• fast-json-clone (this package): This package

Results

Here are the results of each benchmark suites.

• Node.js 18.8.0
• iMac 2020
• macOS 11

LARGE:

Naive deep clone                x 269 ops/sec ±0.33% (90 runs sampled)
JSON serialize/deserialize      x 144 ops/sec ±0.97% (82 runs sampled)
Native structuredClone          x 156 ops/sec ±0.44% (79 runs sampled)
structuredClone polyfill        x 156 ops/sec ±0.31% (80 runs sampled)
lodash.clonedeep                x 169 ops/sec ±2.22% (82 runs sampled)
clone-deep                      x 239 ops/sec ±0.62% (87 runs sampled)
rfdc (default)                  x 558 ops/sec ±0.31% (94 runs sampled)
rfdc (proto)                    x 624 ops/sec ±0.60% (94 runs sampled)
fastest-json-copy               x 627 ops/sec ±0.36% (94 runs sampled)
fast-json-clone (this package)  x 664 ops/sec ±0.33% (96 runs sampled)

Fastest is fast-json-clone (this package)

MEDIUM:

Naive deep clone               x 377,647 ops/sec ±0.65% (96 runs sampled)
JSON serialize/deserialize     x 140,507 ops/sec ±0.28% (91 runs sampled)
Native structuredClone         x 127,046 ops/sec ±0.56% (93 runs sampled)
structuredClone polyfill       x 128,153 ops/sec ±0.26% (95 runs sampled)
lodash.clonedeep               x 275,571 ops/sec ±0.30% (94 runs sampled)
clone-deep                     x 406,903 ops/sec ±0.28% (93 runs sampled)
rfdc (default)                 x 586,620 ops/sec ±0.57% (95 runs sampled)
rfdc (proto)                   x 726,523 ops/sec ±0.25% (98 runs sampled)
fastest-json-copy              x 831,693 ops/sec ±0.48% (93 runs sampled)
fast-json-clone (this package) x 934,265 ops/sec ±0.38% (94 runs sampled)

Fastest is fast-json-clone (this package)

SMALL:

Naive deep clone               x 1,026,835 ops/sec ±0.20% (99 runs sampled)
JSON serialize/deserialize     x 523,975   ops/sec ±0.21% (94 runs sampled)
Native structuredClone         x 328,045   ops/sec ±0.43% (95 runs sampled)
structuredClone polyfill       x 324,168   ops/sec ±0.82% (95 runs sampled)
lodash.clonedeep               x 780,213   ops/sec ±0.99% (99 runs sampled)
clone-deep                     x 1,143,784 ops/sec ±0.34% (96 runs sampled)
rfdc (default)                 x 1,678,649 ops/sec ±0.24% (95 runs sampled)
rfdc (proto)                   x 1,931,670 ops/sec ±0.60% (97 runs sampled)
fastest-json-copy              x 2,884,027 ops/sec ±0.25% (94 runs sampled)
fast-json-clone (this package) x 3,114,469 ops/sec ±0.25% (96 runs sampled)

Fastest is fast-json-clone (this package)

EMPTY:

Naive deep clone               x 58,467,338  ops/sec ±1.26% (91 runs sampled)
JSON serialize/deserialize     x 3,922,987   ops/sec ±0.84% (91 runs sampled)
Native structuredClone         x 759,267     ops/sec ±0.60% (96 runs sampled)
structuredClone polyfill       x 761,859     ops/sec ±0.41% (96 runs sampled)
lodash.clonedeep               x 4,348,871   ops/sec ±0.26% (96 runs sampled)
clone-deep                     x 5,697,636   ops/sec ±0.56% (97 runs sampled)
rfdc (default)                 x 65,027,170  ops/sec ±1.14% (92 runs sampled)
rfdc (proto)                   x 87,071,104  ops/sec ±2.27% (90 runs sampled)
fastest-json-copy              x 70,005,364  ops/sec ±1.47% (90 runs sampled)
fast-json-clone (this package) x 113,750,854 ops/sec ±5.74% (74 runs sampled)

Fastest is fast-json-clone (this package)