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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 558B 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 @ 910,961 ops/sec ± 0.30%
✔ deep ~ 8.7µs @ 115,162 ops/sec ± 1.80%
✔ deep circular ~ 5.7µs @ 175,990 ops/sec ± 0.22%
✔ big ~ 140.9µs @ 7,095 ops/sec ± 0.08%
✔ leafy ~ 23.0µs @ 43,393 ops/sec ± 1.10%
All candidates
simple
✔ object-identity ~ 1.1µs @ 910,961 ops/sec ± 0.30%
✔ safe-stable-stringify ~ 1.7µs @ 593,432 ops/sec ± 0.15%
✔ ohash ~ 3.5µs @ 286,954 ops/sec ± 0.00%
✔ object-hash ~ 9.5µs @ 105,175 ops/sec ± 1.84%
✔ hash-it † ~ 2.7µs @ 364,963 ops/sec ± 2.26%
✔ json-stable-stringify ~ 3.2µs @ 315,125 ops/sec ± 0.64%
✔ fast-json-stable-stringify ~ 2.0µs @ 495,655 ops/sec ± 0.52%
✔ tiny-stable-stringify ~ 2.3µs @ 429,496 ops/sec ± 0.00%
✔ json-stringify-deterministic ~ 3.3µs @ 303,470 ops/sec ± 0.08%
✔ json-stable-stringify-without-jsonify ~ 3.1µs @ 323,737 ops/sec ± 1.89%
✔ canonicalize ~ 3.3µs @ 303,716 ops/sec ± 0.10%
✘ @tufjs/canonical-json
─────────────────────────────────────────────────────────────────────────
⭐︎ object-identity (53.5% faster than safe-stable-stringify)
deep
✔ object-identity ~ 8.7µs @ 115,162 ops/sec ± 1.80%
✔ safe-stable-stringify ~ 13.6µs @ 73,438 ops/sec ± 0.24%
✔ ohash ~ 26.1µs @ 38,257 ops/sec ± 0.05%
✔ object-hash ~ 53.8µs @ 18,572 ops/sec ± 0.72%
✔ hash-it † ~ 21.7µs @ 46,100 ops/sec ± 1.80%
✔ json-stable-stringify ~ 22.5µs @ 44,539 ops/sec ± 1.46%
✔ fast-json-stable-stringify ~ 13.4µs @ 74,806 ops/sec ± 0.88%
✔ tiny-stable-stringify ~ 15.5µs @ 64,717 ops/sec ± 0.50%
✔ json-stringify-deterministic ~ 22.7µs @ 44,121 ops/sec ± 1.10%
✔ json-stable-stringify-without-jsonify ~ 22.1µs @ 45,243 ops/sec ± 1.22%
✔ canonicalize ~ 25.0µs @ 39,935 ops/sec ± 1.16%
✔ @tufjs/canonical-json ~ 33.5µs @ 29,867 ops/sec ± 1.31%
──────────────────────────────────────────────────────────────────────────
⭐︎ object-identity (53.9% faster than fast-json-stable-stringify)
deep circular
✔ object-identity ~ 5.7µs @ 175,990 ops/sec ± 0.22%
✔ safe-stable-stringify ~ 7.2µs @ 138,163 ops/sec ± 1.36%
✔ ohash ~ 16.9µs @ 59,172 ops/sec ± 2.12%
✔ object-hash ~ 44.8µs @ 22,345 ops/sec ± 1.22%
✔ hash-it † ~ 15.4µs @ 64,834 ops/sec ± 2.48%
✘ json-stable-stringify
✘ fast-json-stable-stringify
✘ tiny-stable-stringify
✘ json-stringify-deterministic
✘ json-stable-stringify-without-jsonify
✘ canonicalize
✘ @tufjs/canonical-json
──────────────────────────────────────────────────────────────────────────
⭐︎ object-identity (27.4% faster than safe-stable-stringify)
big
✔ object-identity ~ 140.9µs @ 7,095 ops/sec ± 0.08%
✔ safe-stable-stringify ~ 135.6µs @ 7,377 ops/sec ± 1.24%
✔ ohash ~ 292.0µs @ 3,424 ops/sec ± 0.02%
✔ object-hash ~ 469.1µs @ 2,132 ops/sec ± 1.36%
✔ hash-it † ~ 258.4µs @ 3,871 ops/sec ± 0.22%
✔ json-stable-stringify ~ 209.4µs @ 4,776 ops/sec ± 0.50%
✔ fast-json-stable-stringify ~ 150.4µs @ 6,647 ops/sec ± 0.68%
✔ tiny-stable-stringify ~ 164.6µs @ 6,076 ops/sec ± 0.06%
✔ json-stringify-deterministic ~ 268.9µs @ 3,719 ops/sec ± 0.90%
✔ json-stable-stringify-without-jsonify ~ 220.8µs @ 4,529 ops/sec ± 0.10%
✔ canonicalize ~ 240.3µs @ 4,162 ops/sec ± 0.61%
✔ @tufjs/canonical-json ~ 369.3µs @ 2,708 ops/sec ± 0.38%
─────────────────────────────────────────────────────────────────────────
⭐︎ safe-stable-stringify (4.0% faster than object-identity)
leafy
✔ object-identity ~ 23.0µs @ 43,393 ops/sec ± 1.10%
✔ safe-stable-stringify ~ 48.8µs @ 20,510 ops/sec ± 0.61%
✔ ohash ~ 31.7µs @ 31,549 ops/sec ± 1.41%
✔ object-hash ~ 84.5µs @ 11,837 ops/sec ± 1.50%
✔ hash-it † ~ 79.5µs @ 12,585 ops/sec ± 0.26%
✔ json-stable-stringify ~ 105.9µs @ 9,439 ops/sec ± 0.26%
✔ fast-json-stable-stringify ~ 54.8µs @ 18,234 ops/sec ± 1.77%
✔ tiny-stable-stringify ~ 101.9µs @ 9,810 ops/sec ± 0.51%
✔ json-stringify-deterministic ~ 123.0µs @ 8,133 ops/sec ± 1.66%
✔ json-stable-stringify-without-jsonify ~ 114.9µs @ 8,702 ops/sec ± 0.25%
✔ canonicalize ~ 91.0µs @ 10,986 ops/sec ± 0.06%
✔ @tufjs/canonical-json ~ 215.3µs @ 4,646 ops/sec ± 0.31%
──────────────────────────────────────────────────────────────────────────
⭐︎ object-identity (37.5% 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