One serializer. Three contracts.

@stackline/stable-stringify

Deterministic JSON for cache keys, safe output for diagnostics, and RFC 8785 canonical bytes for signatures.

npm install @stackline/stable-stringify

v1.0.2 Zero runtime dependencies Node 14.17+

Production bundle

Serialization playground

Preset

Mode

Cycles BigInt Accessors Formatting Indent

Max depth Max entries Max length

JSON + playground tags

Ready 0.000 ms 0 characters Stable

Lowest-change adoption

Use an npm alias to preserve the established package name and function signature while gaining the maintained distribution.

npm install fast-json-stable-stringify@npm:@stackline/stable-stringify

import stringify from 'fast-json-stable-stringify';

const key = stringify({ z: 1, a: 2 });

Purpose-built policies

Compatible deterministic output for cache keys, snapshots, deduplication, and reproducible builds.

stringify(value, options)

Bounded cycle and BigInt handling for logs, diagnostics, and failure paths that must remain observable.

safeStringify(value)

Strict RFC 8785 strings and UTF-8 bytes for signatures, hashes, and cross-system verification.

canonicalizeBytes(value)

Public contract

Full reference

Export	Purpose	Failure behavior
`stableStringify(value, options?)`	Deterministic JSON	Compatible throws and omission
`safeStringify(value, replacer?, space?, options?)`	Bounded diagnostics	Controlled fallback by default
`canonicalize(value, options?)`	RFC 8785 string	Rejects non-I-JSON input
`canonicalizeBytes(value, options?)`	Canonical UTF-8 bytes	Rejects non-I-JSON input
`configure(defaults?)`	Reusable stable serializer	Validates options immediately

Release evidence