# Instagram/ig-json-parser

Fast JSON parser for java projects

Repository: https://github.com/Instagram/ig-json-parser
Canonical: https://ross.abutalabs.com/products/ig-json-parser
Homepage: https://instagram-engineering.com/fast-auto-generated-streaming-json-parsing-for-android-ab8e7be21033
Language: Java
License: MIT
License Family: permissive
Archived: true
Last push: 2022-09-23T22:33:19+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 4466, "days_push": 1440, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, archived
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1317, forks 127 (observed 2026-08-28T04:04:21.038611+00:00)

## What it is
A fast JSON parser library for Java projects that uses annotation processing to generate serializers and deserializers at compile time. Model classes are annotated with @JsonType and @JsonField, and helper classes are auto-generated for parsing and serialization.

## Use cases
- parse json into java objects quickly
- generate json serializers and deserializers at compile time
- fast json parsing on android
- avoid reflection overhead in json parsing
- map json fields to java model classes with annotations

## When to choose
- you need maximum json parsing performance on the JVM or Android
- you prefer compile-time code generation over runtime reflection
- you want a lightweight annotation-based json mapping solution

## When to avoid
- you need a maintained library with active development
- you want runtime-flexible json parsing without annotation processing
- you prefer popular alternatives like Moshi or Jackson with broader ecosystem support

## Facets
- artifact type: library
- maturity: maintenance
- function: parser, serialization
- domain: developer-tools, mobile-development, backend
- platform: jvm
- tags: json, annotation-processor, code-generation, android

## Member repositories
- Instagram/ig-json-parser (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:21.038611+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 2026-08-30T04:48:11.473631+00:00, confidence not recorded.
  - readme: https://github.com/Instagram/ig-json-parser (fetched 2026-08-28T04:04:21.038611+00:00, sha 7ced53dc7713)
- Data as of 2026-08-30T08:39:29.467469+00:00.