# buger/jsonparser

THE fastest alternative JSON parser for Go that does not require schema

Repository: https://github.com/buger/jsonparser
Canonical: https://ross.abutalabs.com/products/jsonparser
Homepage: https://blog.reqproof.com/p/celebrating-ten-years-of-jsonparser
Language: Go
License: MIT
License Family: permissive
Topics: json, json-parser, go, perfomance, parser
Last push: 2026-08-21T19:33:45+00:00

## Health v2 (maintenance only)
Score: 97/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 98, release rhythm 95, longevity 100
- inputs: {"age_days": 3818, "days_push": 12, "days_rel": 34, "gap_med": 0.0, "n_releases_24m": 9}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 5648, forks 457 (observed 2026-08-28T04:09:26.961423+00:00)

## What it is
A fast, zero-allocation JSON parser for Go that lets you extract fields by path without defining structs or schemas. It is significantly faster than the standard encoding/json package and has been formally verified with 100% MC/DC coverage.

## Use cases
- parse json without defining structs in go
- extract fields from unpredictable third-party api responses
- fast json parsing for high-throughput log processing
- parse large json files with minimal memory allocation
- query json values by path in go
- speed up json deserialization compared to encoding/json

## When to choose
- you need maximum json parsing performance in Go with zero allocations
- you don't know the json structure ahead of time and want path-based field access
- you're processing gigabytes of json from APIs, logs, or analytics events
- you want a dependency-free parser with formal correctness guarantees

## When to avoid
- you need to unmarshal json into typed Go structs with full encoding/json compatibility
- your workloads are small or performance is not a concern
- you need marshaling/serialization of complex object graphs rather than reading values

## Facets
- artifact type: library
- maturity: active
- function: parser, serialization, json
- domain: parsers, developer-tools, performance
- platform: go, cross-platform
- tags: zero-allocation, schemaless-json, json-path-access, high-performance, formally-verified

## Member repositories
- buger/jsonparser (main) score 97

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:26.961423+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:55:17.100653+00:00, confidence not recorded.
  - readme: https://github.com/buger/jsonparser (fetched 2026-08-28T04:09:26.961423+00:00, sha 391313b459af)
  - homepage: https://blog.reqproof.com/p/celebrating-ten-years-of-jsonparser (fetched 2026-08-29T08:49:43.139561+00:00, sha bbc362e1868a)
- Data as of 2026-08-30T08:39:29.467469+00:00.