Serde
The foundational serialization/deserialization framework for Rust. Derive macros (#[derive(Serialize, Deserialize)]) automatically implement serialization for Rust structs and enums for any supported format. Works with serde_json (JSON), serde_yaml (YAML), toml, bincode, MessagePack, and 50+ other formats through a single generic interface. Used in virtually every Rust project that handles external data.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
MIT/Apache 2.0 dual licensed. Memory-safe Rust — no buffer overflows during deserialization. Widely audited. Trusted for security-critical applications.
⚡ Reliability
Best When
You're writing any Rust code that processes JSON, YAML, TOML, or other external data formats — serde is effectively mandatory for Rust data handling.
Avoid When
You need dynamic/untyped JSON manipulation — use serde_json::Value. Serde's strength is typed deserialization; avoid it for purely dynamic scenarios.
Use Cases
- • Serialize Rust agent structs to JSON for REST APIs and deserialize JSON responses to typed Rust structs
- • Define typed API request/response types that automatically serialize/deserialize with derive macros
- • Process configuration files (YAML, TOML, JSON) into typed Rust configuration structs in agent services
- • Serialize agent state to efficient binary formats (bincode, MessagePack) for storage or IPC
- • Build type-safe Rust agent clients for external APIs where JSON structures map to Rust types
Not For
- • Schema-first API definition — serde is type-first; use OpenAPI tools if you need schema-first development
- • Dynamic JSON manipulation without types — use serde_json::Value for untyped JSON; serde shines with typed structs
- • Non-Rust languages — serde is Rust-only; use Pydantic for Python, Zod for TypeScript
Interface
Authentication
Local library — no authentication required. MIT/Apache 2.0 dual licensed.
Pricing
MIT/Apache 2.0 dual licensed. Zero cost.
Agent Metadata
Known Gotchas
- ⚠ #[derive(Serialize, Deserialize)] requires serde feature flags in Cargo.toml: serde = { version = '1', features = ['derive'] } — forgetting 'derive' feature is the most common mistake
- ⚠ Field renaming: #[serde(rename = 'snake_case_name')] or #[serde(rename_all = 'camelCase')] on the struct — useful for API response fields that differ from Rust naming conventions
- ⚠ Optional fields: Option<T> fields serialize as null (or absent if skip_serializing_if); use #[serde(skip_serializing_if = 'Option::is_none')] to omit null fields in JSON output
- ⚠ Unknown fields: #[serde(deny_unknown_fields)] rejects JSON with extra fields; default is to ignore unknown — explicit for strict API clients
- ⚠ Custom serialization: #[serde(with = 'module')] delegates to a custom module's serialize/deserialize functions — needed for types without Serde support (chrono dates, UUIDs)
- ⚠ Untagged enums: #[serde(untagged)] tries each variant in order — can be slow and error messages for failure are unclear; prefer tagged enums for agent API schemas
Alternatives
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Scores are editorial opinions as of 2026-03-07.