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readme.md
object-identity 
A tiny, fast utility that canonicalizes any value into a stable identity, for structurally equality.
This is free to use software, but if you do like it, consider supporting me ❤️
⚡ Features
- 🧬 Canonical. The same shape always produces the same id.
- 🌀 Deep and cycle-safe. Handles nested objects, arrays, sets, maps, and circular references.
- 🏎 Fast. See the benchmarks.
- 🪶 Tiny. Around 535B minified and gzipped, with zero dependencies.
⚙️ Install
- npm — available as
object-identity - JSR — available as
@mr/object-identity
🚀 Usage
import { identify } from 'object-identity';
// same shape, different key order, same id
identify({ a: 1, b: 2 }) === identify({ b: 2, a: 1 }); // true
// a plain object and an equivalent Map produce the same id
identify({ a: 'b' }) === identify(new Map([['a', 'b']])); // true
// nesting, Sets, Dates, and RegExps are all supported
const key = identify({ user: 7, filters: new Set(['active', 'new']) });💨 Benchmark
- simple a complete nested object, with an arrays and other mixed primitives.
- deep a long, narrow nesting chain.
- deep circular the deep chain, but every node points back and the tail closes the loop.
- big a wide object: hundreds of keys, but with small values.
- leafy a large flat array of mixed primitives.
✔ simple ~ 1.1µs @ 870,271 ops/sec ± 0.22%
✔ deep ~ 8.4µs @ 118,807 ops/sec ± 0.01%
✔ deep circular ~ 6.0µs @ 166,470 ops/sec ± 0.51%
✔ big ~ 82.1µs @ 12,175 ops/sec ± 1.06%
✔ leafy ~ 23.8µs @ 41,957 ops/sec ± 0.70%
All candidates
simple
✔ object-identity ~ 1.1µs @ 870,271 ops/sec ± 0.22%
✔ safe-stable-stringify ~ 1.8µs @ 563,781 ops/sec ± 0.46%
✔ ohash ~ 3.8µs @ 262,901 ops/sec ± 0.25%
✔ object-hash ~ 10.2µs @ 98,164 ops/sec ± 1.84%
✔ hash-it † ~ 3.0µs @ 335,235 ops/sec ± 2.05%
✔ json-stable-stringify ~ 3.1µs @ 317,679 ops/sec ± 0.30%
✔ fast-json-stable-stringify ~ 2.1µs @ 471,606 ops/sec ± 0.22%
✔ tiny-stable-stringify ~ 2.5µs @ 403,418 ops/sec ± 1.49%
✔ json-stringify-deterministic ~ 3.2µs @ 313,455 ops/sec ± 0.63%
✔ json-stable-stringify-without-jsonify ~ 3.2µs @ 312,450 ops/sec ± 0.59%
✔ json-sorted-stringify ~ 2.4µs @ 411,299 ops/sec ± 0.86%
✔ canonicalize ~ 3.7µs @ 271,025 ops/sec ± 0.17%
✔ swr/_internal/stableHash ~ 3.9µs @ 255,223 ops/sec ± 0.60%
✘ @tufjs/canonical-json
──────────────────────────────────────────────────────────────────────────
⭐︎ object-identity (1.54x faster than safe-stable-stringify)
deep
✔ object-identity ~ 8.4µs @ 118,807 ops/sec ± 0.01%
✔ safe-stable-stringify ~ 13.3µs @ 75,024 ops/sec ± 0.66%
✔ ohash ~ 26.0µs @ 38,497 ops/sec ± 0.57%
✔ object-hash ~ 56.2µs @ 17,807 ops/sec ± 0.95%
✔ hash-it † ~ 22.8µs @ 43,812 ops/sec ± 0.14%
✔ json-stable-stringify ~ 24.1µs @ 41,487 ops/sec ± 0.95%
✔ fast-json-stable-stringify ~ 14.2µs @ 70,522 ops/sec ± 0.39%
✔ tiny-stable-stringify ~ 16.1µs @ 62,039 ops/sec ± 0.56%
✔ json-stringify-deterministic ~ 23.2µs @ 43,102 ops/sec ± 0.15%
✔ json-stable-stringify-without-jsonify ~ 23.3µs @ 42,858 ops/sec ± 0.18%
✔ json-sorted-stringify ~ 15.8µs @ 63,287 ops/sec ± 0.73%
✔ canonicalize ~ 26.8µs @ 37,383 ops/sec ± 0.16%
✔ swr/_internal/stableHash ~ 29.0µs @ 34,460 ops/sec ± 22.90%
✔ @tufjs/canonical-json ~ 34.9µs @ 28,625 ops/sec ± 0.17%
───────────────────────────────────────────────────────────────────────────
⭐︎ object-identity (1.58x faster than safe-stable-stringify)
deep circular
✔ object-identity ~ 6.0µs @ 166,470 ops/sec ± 0.51%
✔ safe-stable-stringify ~ 7.5µs @ 132,624 ops/sec ± 0.27%
✔ ohash ~ 17.2µs @ 58,116 ops/sec ± 0.49%
✔ object-hash ~ 45.7µs @ 21,863 ops/sec ± 0.07%
✔ hash-it † ~ 16.1µs @ 61,985 ops/sec ± 0.31%
✘ json-stable-stringify
✔ fast-json-stable-stringify ~ 10.2µs @ 97,666 ops/sec ± 0.51%
✘ tiny-stable-stringify
✔ json-stringify-deterministic ~ 15.5µs @ 64,604 ops/sec ± 0.41%
✘ json-stable-stringify-without-jsonify
✘ json-sorted-stringify
✘ canonicalize
✔ swr/_internal/stableHash ~ 15.4µs @ 65,066 ops/sec ± 21.11%
✘ @tufjs/canonical-json
───────────────────────────────────────────────────────────────────────────
⭐︎ object-identity (1.26x faster than safe-stable-stringify)
big
✔ object-identity ~ 82.1µs @ 12,175 ops/sec ± 1.06%
✔ safe-stable-stringify ~ 140.5µs @ 7,118 ops/sec ± 0.04%
✔ ohash ~ 304.4µs @ 3,285 ops/sec ± 0.53%
✔ object-hash ~ 513.2µs @ 1,949 ops/sec ± 1.23%
✔ hash-it † ~ 276.5µs @ 3,617 ops/sec ± 0.61%
✔ json-stable-stringify ~ 228.2µs @ 4,382 ops/sec ± 1.06%
✔ fast-json-stable-stringify ~ 164.2µs @ 6,091 ops/sec ± 0.56%
✔ tiny-stable-stringify ~ 180.0µs @ 5,556 ops/sec ± 1.08%
✔ json-stringify-deterministic ~ 224.9µs @ 4,447 ops/sec ± 1.01%
✔ json-stable-stringify-without-jsonify ~ 224.1µs @ 4,463 ops/sec ± 0.66%
✔ json-sorted-stringify ~ 172.5µs @ 5,797 ops/sec ± 0.21%
✔ canonicalize ~ 262.7µs @ 3,807 ops/sec ± 1.01%
✔ swr/_internal/stableHash ~ 287.7µs @ 3,476 ops/sec ± 16.90%
✔ @tufjs/canonical-json ~ 387.7µs @ 2,580 ops/sec ± 0.32%
───────────────────────────────────────────────────────────────────────────
⭐︎ object-identity (1.71x faster than safe-stable-stringify)
leafy
✔ object-identity ~ 23.8µs @ 41,957 ops/sec ± 0.70%
✔ safe-stable-stringify ~ 50.3µs @ 19,896 ops/sec ± 0.47%
✔ ohash ~ 30.9µs @ 32,336 ops/sec ± 0.38%
✔ object-hash ~ 87.7µs @ 11,397 ops/sec ± 1.27%
✔ hash-it † ~ 84.3µs @ 11,860 ops/sec ± 0.97%
✔ json-stable-stringify ~ 115.1µs @ 8,686 ops/sec ± 0.87%
✔ fast-json-stable-stringify ~ 59.6µs @ 16,765 ops/sec ± 0.11%
✔ tiny-stable-stringify ~ 107.8µs @ 9,277 ops/sec ± 0.23%
✔ json-stringify-deterministic ~ 116.5µs @ 8,583 ops/sec ± 0.29%
✔ json-stable-stringify-without-jsonify ~ 117.2µs @ 8,532 ops/sec ± 0.35%
✔ json-sorted-stringify ~ 107.9µs @ 9,266 ops/sec ± 0.15%
✔ canonicalize ~ 93.3µs @ 10,720 ops/sec ± 0.50%
✔ swr/_internal/stableHash ~ 134.1µs @ 7,459 ops/sec ± 31.44%
✔ @tufjs/canonical-json ~ 217.2µs @ 4,605 ops/sec ± 1.07%
───────────────────────────────────────────────────────────────────────────
⭐︎ object-identity (1.30x faster than ohash)
object-identityonly handles mainly JSON-like data by design. It won't fingerprint functions or every Node builtin the way some alternatives do, so these numbers only reflect the payloads it targets.
License
MIT © Marais Rossouw