jsoniter

Health v2 · maintenance only

Flags: archived

Adoption not part of the score

13876 stars · 1053 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

jsoniter is a high-performance JSON serialization and parsing library for Go (with a Java variant) that serves as a 100% compatible drop-in replacement for the standard encoding/json package. It requires no code generation and offers significantly faster marshal/unmarshal with lower allocations, plus a lazy 'Get' API for path-based JSON access.

Use cases

• speed up json.Marshal and json.Unmarshal in Go without changing code
• drop-in replacement for encoding/json with better performance
• parse JSON without defining structs
• extract nested JSON values by path
• reduce memory allocations in JSON encoding
• migrate Go code from standard library JSON to a faster parser

When to choose

• your Go application is bottlenecked on JSON encoding/decoding
• you want faster JSON without code generation steps like easyjson
• you need near-100% compatibility with encoding/json behavior
• you want lazy path-based access to JSON fields without structs

When to avoid

• your JSON workloads are small and not performance-critical, where the standard library suffices
• you need guaranteed map key ordering identical to the standard library without using the compatibility config
• you need lossless float precision with the ConfigFastest mode
• you are not using Go or Java

Facets

library · maturity maintenance

serialization parser json developer-tools backend apis performance go cross-platform json-parser drop-in-replacement encoding-json high-performance deserialization

Member repositories

For agents

markdown · JSON · MCP: product_card(name="json-iterator/go")