{"passport":{"unfragile":{"@version":"1.0","version":"2026-05","artifact":{"id":"github-mailru--easyjson","slug":"mailru--easyjson","name":"easyjson","type":"repo","url":"https://github.com/mailru/easyjson","page_url":"https://unfragile.ai/mailru--easyjson","categories":["frameworks-sdks"],"tags":["code-generation","golang","json","json-parser","json-serialization","perfomance"],"pricing":{"model":"open_source","free":true,"starting_price":null},"status":"active","verified":false},"capabilities":[{"id":"github-mailru--easyjson__cap_0","uri":"capability://code.generation.editing.build.time.code.generation.for.type.specific.json.marshalers","name":"build-time code generation for type-specific json marshalers","description":"Analyzes Go struct definitions at build time and generates specialized MarshalEasyJSON methods that serialize structs to JSON without runtime reflection. The generator parses Go source files, identifies target structs (via tags or -all flag), and emits optimized marshaling code to *_easyjson.go files. This eliminates the reflection overhead of encoding/json by pre-computing type layouts and field orderings during compilation.","intents":["I want to serialize Go structs to JSON 3-4x faster than the standard library","I need to reduce memory allocations during JSON marshaling by ~55%","I want to integrate high-performance JSON serialization into my build pipeline without runtime overhead"],"best_for":["Go backend developers building high-throughput APIs and microservices","Teams optimizing JSON serialization in latency-sensitive applications","Developers migrating from encoding/json seeking drop-in performance improvements"],"limitations":["Requires explicit code generation step in build pipeline — not transparent like encoding/json","Generated code is Go-specific and cannot be shared across language boundaries","Custom marshaling logic must be manually implemented for non-standard types","Changes to struct definitions require regenerating code; no dynamic struct support"],"requires":["Go 1.8+","easyjson command-line tool installed (go install github.com/mailru/easyjson/cmd/easyjson@latest)","Struct definitions in Go source files with //easyjson:json tags or -all flag"],"input_types":["Go source code files containing struct definitions","Struct field tags (json, easyjson)"],"output_types":["Go source code (*_easyjson.go files with MarshalEasyJSON methods)","Compiled Go binaries with optimized marshaling"],"categories":["code-generation-editing","performance-optimization"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github-mailru--easyjson__cap_1","uri":"capability://code.generation.editing.build.time.code.generation.for.type.specific.json.unmarshalers","name":"build-time code generation for type-specific json unmarshalers","description":"Generates specialized UnmarshalEasyJSON methods that deserialize JSON into Go structs using a custom lexer instead of reflection. The unmarshaler generator creates type-aware parsing code that directly populates struct fields, leveraging the jlexer component for efficient token extraction. This approach performs 5-6x faster than encoding/json while reducing allocations by ~40% through minimal validation and direct field assignment.","intents":["I want to deserialize JSON into Go structs 5-6x faster than the standard library","I need to reduce memory allocations during JSON unmarshaling by ~40%","I want to parse JSON with minimal validation overhead while maintaining correctness"],"best_for":["Go backend developers processing high-volume JSON payloads from APIs or message queues","Teams building real-time data pipelines requiring sub-millisecond JSON parsing","Developers optimizing concurrent unmarshaling workloads (6-7x faster than encoding/json)"],"limitations":["Unmarshaler generation requires struct definitions to be known at build time","Does not perform full JSON schema validation — validates only enough to parse correctly","Custom unmarshaling logic for complex types must be manually implemented","No support for dynamically-typed JSON (e.g., interface{} fields require custom handlers)"],"requires":["Go 1.8+","easyjson command-line tool","Struct definitions with //easyjson:json tags or -all flag","jlexer runtime component (included in easyjson package)"],"input_types":["JSON byte slices or strings","Go struct definitions (for code generation)"],"output_types":["Populated Go struct instances","Generated UnmarshalEasyJSON methods in *_easyjson.go files"],"categories":["code-generation-editing","data-processing-analysis"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github-mailru--easyjson__cap_10","uri":"capability://automation.workflow.integration.with.go.build.system.via.go.generate.directives","name":"integration with go build system via go:generate directives","description":"Enables transparent code generation integration into Go's standard build process through go:generate directives embedded in source files. Developers add //go:generate easyjson -all comments to Go files, and the go generate command automatically runs the easyjson tool before compilation. This integrates code generation seamlessly into existing build pipelines without requiring custom build scripts or Makefiles.","intents":["I want to automatically generate easyjson code as part of my Go build process","I need to keep generated code in sync with struct definitions without manual steps","I want to integrate easyjson into CI/CD pipelines using standard Go tooling"],"best_for":["Go developers using standard Go build tools and CI/CD systems","Teams automating code generation in GitHub Actions, GitLab CI, or similar","Developers maintaining large Go projects with multiple packages"],"limitations":["go:generate directives are per-file; no project-wide configuration","Generated code must be committed to version control or regenerated on each build","No IDE integration for automatic generation on file save","Build failures if easyjson tool is not installed in the build environment"],"requires":["Go 1.4+ (go:generate support)","easyjson command-line tool installed in build environment","go:generate directives in source files"],"input_types":["Go source files with //go:generate easyjson directives"],"output_types":["Generated *_easyjson.go files (created during go generate)","Compiled Go binaries with optimized marshaling code"],"categories":["automation-workflow","code-generation-editing"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github-mailru--easyjson__cap_11","uri":"capability://automation.workflow.comprehensive.test.suite.with.performance.benchmarks","name":"comprehensive test suite with performance benchmarks","description":"Includes extensive unit tests covering struct marshaling/unmarshaling, edge cases (unknown fields, null values, custom types), and performance benchmarks comparing easyjson against encoding/json and ffjson. The test suite validates correctness across different struct types, field configurations, and JSON inputs, while benchmarks quantify performance gains (3-6x faster marshaling, 5-6x faster unmarshaling) and allocation reductions (~40-55%).","intents":["I want to verify that easyjson produces correct JSON output for my structs","I need to benchmark easyjson performance against encoding/json in my environment","I want to ensure easyjson handles edge cases (unknown fields, nulls, custom types) correctly"],"best_for":["Go developers evaluating easyjson for adoption in their projects","Teams validating performance improvements before migration","Developers debugging marshaling/unmarshaling issues"],"limitations":["Benchmarks are synthetic and may not reflect real-world workload characteristics","Test suite is internal to easyjson; no public test harness for custom types","Benchmarks are Go-specific; no cross-language performance comparisons","Performance results vary based on struct complexity and JSON size"],"requires":["Go 1.8+","easyjson source code or installed package","go test command"],"input_types":["Go test files (*_test.go)","Benchmark test cases"],"output_types":["Test pass/fail results","Benchmark performance metrics (ns/op, B/op, allocations/op)"],"categories":["automation-workflow","data-processing-analysis"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github-mailru--easyjson__cap_2","uri":"capability://data.processing.analysis.custom.json.lexer.with.minimal.validation.and.optimized.token.extraction","name":"custom json lexer with minimal validation and optimized token extraction","description":"Implements jlexer, a high-performance JSON tokenizer that extracts typed values from JSON input with minimal memory allocations and validation overhead. Unlike the standard library's fully-validating parser, jlexer performs just-enough validation to correctly parse input while skipping unnecessary checks. It directly extracts integers, floats, strings, and booleans into Go types, with optimizations for string handling and buffer reuse through sync.Pool.","intents":["I want to parse JSON tokens with minimal memory allocations and validation overhead","I need to extract typed values (int, float, string, bool) from JSON efficiently","I want to integrate a custom lexer into my unmarshaling pipeline that avoids full JSON validation"],"best_for":["Go developers building custom JSON parsers or deserializers","Teams optimizing JSON parsing in latency-critical paths","Developers integrating easyjson's unmarshaling into existing codebases"],"limitations":["Minimal validation means some malformed JSON may parse partially before failing","No built-in error recovery — parsing stops at first error","Lexer is internal to easyjson; direct usage requires understanding jlexer API","Does not support streaming JSON parsing — requires full input in memory"],"requires":["Go 1.8+","easyjson package imported (github.com/mailru/easyjson/jlexer)","JSON input as byte slice or string"],"input_types":["JSON byte slices","JSON strings"],"output_types":["Extracted Go values (int, float, string, bool, nested objects/arrays)","Lexer state for continued parsing"],"categories":["data-processing-analysis","code-generation-editing"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github-mailru--easyjson__cap_3","uri":"capability://data.processing.analysis.optimized.json.writer.with.buffer.pooling.and.direct.output.streaming","name":"optimized json writer with buffer pooling and direct output streaming","description":"Implements jwriter, a high-performance JSON serialization component that writes Go data structures to JSON with optimized buffer management and direct output streaming. The writer uses a buffer pool allocating memory in increasing chunks (128 to 32768 bytes) with sync.Pool reuse for chunks ≥512 bytes, reducing garbage collection pressure. It supports direct output to HTTP response writers and other io.Writer targets, with specialized string handling optimizations.","intents":["I want to serialize Go structs to JSON with minimal garbage collection overhead","I need to write JSON directly to HTTP responses or network streams efficiently","I want to reuse buffer memory across multiple JSON serialization operations"],"best_for":["Go backend developers building HTTP APIs with high request throughput","Teams optimizing garbage collection in JSON-heavy applications","Developers streaming JSON responses to clients with minimal memory overhead"],"limitations":["Buffer pooling is internal to jwriter; manual buffer management not exposed","No streaming JSON generation — entire output must be buffered before writing","Custom types require manual jwriter integration; not automatic","Pool reuse only applies to chunks ≥512 bytes; smaller allocations are discarded"],"requires":["Go 1.8+","easyjson package imported (github.com/mailru/easyjson/jwriter)","io.Writer target (http.ResponseWriter, bytes.Buffer, etc.)"],"input_types":["Go struct instances","Primitive types (int, float, string, bool)","Slices and maps"],"output_types":["JSON byte slices","Direct writes to io.Writer targets","HTTP response bodies"],"categories":["data-processing-analysis","automation-workflow"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github-mailru--easyjson__cap_4","uri":"capability://code.generation.editing.struct.field.mapping.with.custom.json.tags.and.unknown.field.handling","name":"struct field mapping with custom json tags and unknown field handling","description":"Provides declarative struct field-to-JSON mapping through Go struct tags (json, easyjson) with support for custom field names, omitempty, and unknown field handling strategies. The code generator analyzes struct definitions and produces field mapping code that handles renaming, optional fields, and configurable behavior for unexpected JSON fields (ignore, error, or store). This enables flexible JSON serialization/deserialization without manual field mapping code.","intents":["I want to map Go struct fields to custom JSON property names declaratively","I need to handle unknown JSON fields gracefully (ignore, error, or store them)","I want to support optional fields that omit from JSON when empty"],"best_for":["Go developers building APIs with flexible JSON schemas","Teams handling evolving JSON formats with backward/forward compatibility requirements","Developers integrating with external APIs that may add new fields over time"],"limitations":["Field mapping is determined at code generation time; no runtime flexibility","Unknown field storage requires explicit struct field (e.g., RawMessage) to capture data","Custom tag parsing is limited to standard json/easyjson tags; no plugin system","Nested struct field mapping requires explicit tag propagation"],"requires":["Go 1.8+","Struct definitions with json or easyjson tags","easyjson code generation step"],"input_types":["Go struct definitions with tags","JSON objects with arbitrary fields"],"output_types":["Generated field mapping code in *_easyjson.go files","Populated struct instances with mapped fields","Unknown field storage (if configured)"],"categories":["code-generation-editing","data-processing-analysis"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github-mailru--easyjson__cap_5","uri":"capability://code.generation.editing.optional.type.support.with.null.aware.serialization.and.deserialization","name":"optional type support with null-aware serialization and deserialization","description":"Provides built-in support for optional/nullable types in JSON through special handling of pointer types, custom optional wrappers, and null value semantics. The code generator produces marshaling code that omits null pointers from JSON and unmarshaling code that correctly handles null values by setting pointers to nil. This enables clean representation of optional fields without manual null checking or wrapper types.","intents":["I want to represent optional fields in JSON without manual null checking","I need to serialize null values correctly for pointer types","I want to deserialize JSON nulls into nil pointers without errors"],"best_for":["Go developers building REST APIs with optional response fields","Teams handling JSON schemas with nullable properties","Developers working with external APIs that use null for missing values"],"limitations":["Optional support is limited to pointer types and custom wrappers; no generic Optional<T>","Null handling is determined at code generation time; no runtime configuration","Nested optional types require explicit struct field definitions","No support for optional array/slice elements (only top-level optionality)"],"requires":["Go 1.8+","Pointer types or custom optional wrappers in struct definitions","easyjson code generation"],"input_types":["Go struct definitions with pointer fields","JSON objects with null values"],"output_types":["JSON with omitted null fields (if configured)","Populated struct instances with nil pointers for null values","Generated null-handling code in *_easyjson.go files"],"categories":["code-generation-editing","data-processing-analysis"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github-mailru--easyjson__cap_6","uri":"capability://data.processing.analysis.string.interning.for.reduced.memory.allocations.in.repeated.string.values","name":"string interning for reduced memory allocations in repeated string values","description":"Implements string interning optimization that deduplicates repeated string values during JSON unmarshaling, reducing memory allocations when parsing JSON with many identical strings (e.g., repeated field names or enum values). The unmarshaler caches previously-seen strings and reuses pointers to identical values, leveraging Go's string interning semantics to reduce heap pressure and improve cache locality.","intents":["I want to reduce memory allocations when parsing JSON with repeated string values","I need to optimize unmarshaling of JSON with many identical enum or category values","I want to improve cache locality by deduplicating string allocations"],"best_for":["Go developers parsing JSON with high cardinality repeated strings (logs, events, metrics)","Teams optimizing memory usage in JSON-heavy applications","Developers processing JSON with many enum or categorical values"],"limitations":["String interning is automatic and not configurable; no opt-out mechanism","Interning overhead may exceed benefits for JSON with unique strings","Interned strings are cached per unmarshaling operation; no cross-operation cache","No control over cache size or eviction policy"],"requires":["Go 1.8+","easyjson code generation with string interning enabled (default)","JSON input with repeated string values"],"input_types":["JSON with repeated string values"],"output_types":["Populated struct instances with deduplicated string pointers","Reduced memory allocations"],"categories":["data-processing-analysis","memory-knowledge"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github-mailru--easyjson__cap_7","uri":"capability://code.generation.editing.custom.map.key.type.support.with.type.aware.serialization","name":"custom map key type support with type-aware serialization","description":"Enables JSON marshaling and unmarshaling of maps with non-string key types (int, float, custom types) by generating type-specific key conversion code. The code generator produces marshaling code that converts map keys to JSON-compatible strings and unmarshaling code that parses string keys back to the original type. This allows maps with typed keys to be serialized to JSON while maintaining type safety.","intents":["I want to serialize Go maps with non-string keys (int, float) to JSON","I need to deserialize JSON objects into maps with typed keys","I want to maintain type safety for map keys during JSON round-tripping"],"best_for":["Go developers working with maps keyed by integers or floats","Teams integrating Go services with JSON APIs that use numeric or custom keys","Developers requiring type-safe map serialization without manual key conversion"],"limitations":["Custom key types require explicit code generation support; not all types supported","JSON object keys are always strings; numeric keys are converted to/from strings","Key conversion overhead may impact performance for large maps","No support for complex custom key types without manual marshaling code"],"requires":["Go 1.8+","Map definitions with typed keys in struct fields","easyjson code generation"],"input_types":["Go maps with typed keys (int, float, custom types)","JSON objects with string keys"],"output_types":["JSON objects with string keys (converted from typed keys)","Populated maps with typed keys (converted from JSON string keys)","Generated key conversion code in *_easyjson.go files"],"categories":["code-generation-editing","data-processing-analysis"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github-mailru--easyjson__cap_8","uri":"capability://code.generation.editing.command.line.code.generation.tool.with.flexible.struct.selection","name":"command-line code generation tool with flexible struct selection","description":"Provides an easyjson command-line tool that analyzes Go source files and generates marshaling/unmarshaling code for selected structs. The tool supports multiple selection modes: explicit //easyjson:json tags on structs, -all flag to generate for all structs, or -type flag to specify individual struct names. Generated code is written to *_easyjson.go files in the same package, integrating seamlessly into Go build pipelines.","intents":["I want to generate JSON marshaling code for specific Go structs in my codebase","I need to integrate easyjson code generation into my build pipeline","I want to selectively enable easyjson for some structs while leaving others using encoding/json"],"best_for":["Go developers integrating easyjson into existing projects incrementally","Teams automating code generation in CI/CD pipelines","Developers managing large codebases with selective performance optimization"],"limitations":["Code generation is not transparent; requires explicit build step or go:generate directives","Generated code must be committed to version control or regenerated on each build","Tool does not support custom code generation templates or plugins","No IDE integration; requires manual command invocation or build system setup"],"requires":["Go 1.8+","easyjson command-line tool installed (go install github.com/mailru/easyjson/cmd/easyjson@latest)","Go source files with struct definitions"],"input_types":["Go source files (.go)","Command-line flags (-all, -type, -pkg)"],"output_types":["Generated *_easyjson.go files with marshaling/unmarshaling code","Standard output with generation status/errors"],"categories":["code-generation-editing","automation-workflow"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github-mailru--easyjson__cap_9","uri":"capability://data.processing.analysis.concurrent.marshaling.with.reduced.allocation.overhead","name":"concurrent marshaling with reduced allocation overhead","description":"Optimizes concurrent JSON serialization through buffer pooling and allocation strategies that scale efficiently across multiple goroutines. The sync.Pool-based buffer reuse and tiered allocation chunks (128-32768 bytes) minimize contention and per-operation allocations even under high concurrency. Benchmarks show 6-7x faster concurrent marshaling than encoding/json due to these optimizations.","intents":["I want to serialize JSON concurrently with minimal lock contention and allocations","I need to handle high-throughput concurrent JSON marshaling in my API server","I want to reduce garbage collection pressure in concurrent workloads"],"best_for":["Go backend developers building high-concurrency HTTP APIs","Teams optimizing JSON serialization in multi-threaded applications","Developers handling thousands of concurrent JSON marshaling operations"],"limitations":["Buffer pool contention may increase with very high goroutine counts (>10k concurrent)","Pool reuse is per-chunk size; no cross-size reuse optimization","No explicit control over pool sizing or eviction policies","Concurrent unmarshaling benefits are less pronounced than marshaling (5-6x vs 6-7x)"],"requires":["Go 1.8+","easyjson code generation","Multiple goroutines performing JSON marshaling"],"input_types":["Go struct instances (from multiple goroutines)"],"output_types":["JSON byte slices or io.Writer output","Reduced allocations and GC pressure"],"categories":["data-processing-analysis","automation-workflow"],"confidence":0.5,"matches":0,"success_rate":0}],"trust":{"score":44,"verified":false,"data_access_risk":"high","permissions":["Go 1.8+","easyjson command-line tool installed (go install github.com/mailru/easyjson/cmd/easyjson@latest)","Struct definitions in Go source files with //easyjson:json tags or -all flag","easyjson command-line tool","Struct definitions with //easyjson:json tags or -all flag","jlexer runtime component (included in easyjson package)","Go 1.4+ (go:generate support)","easyjson command-line tool installed in build environment","go:generate directives in source files","easyjson source code or installed package"],"failure_modes":["Requires explicit code generation step in build pipeline — not transparent like encoding/json","Generated code is Go-specific and cannot be shared across language boundaries","Custom marshaling logic must be manually implemented for non-standard types","Changes to struct definitions require regenerating code; no dynamic struct support","Unmarshaler generation requires struct definitions to be known at build time","Does not perform full JSON schema validation — validates only enough to parse correctly","Custom unmarshaling logic for complex types must be manually implemented","No support for dynamically-typed JSON (e.g., interface{} fields require custom handlers)","go:generate directives are per-file; no project-wide configuration","Generated code must be committed to version control or regenerated on each build","builder identity is not verified yet","no observed match outcomes yet"],"rank_breakdown":{"adoption":0.5846158963124837,"quality":0.34,"ecosystem":0.5800000000000001,"match_graph":0.25,"freshness":0.6,"weights":{"adoption":0.3,"quality":0.2,"ecosystem":0.15,"match_graph":0.3,"freshness":0.05}},"observed_outcomes":{"matches":0,"success_rate":0,"avg_confidence":0,"top_intents":[],"last_matched_at":null},"maintenance":{"status":"active","updated_at":"2026-05-24T12:16:22.062Z","last_scraped_at":"2026-05-03T13:58:37.060Z","last_commit":"2026-03-14T14:52:53Z"},"community":{"stars":4880,"forks":457,"weekly_downloads":null,"model_downloads":null,"model_likes":null}},"distribution":{"claim_url":"https://unfragile.ai/submit?claim=mailru--easyjson","compare_url":"https://unfragile.ai/compare?artifact=mailru--easyjson"}},"signature":"HGm78SW7C4zeOspXK2xLzB0BLXbpmGWjGb5yOOZ1BmZy9lvuj+AM4fCHh1lDLtDc+/6GMScLPfO5etzDuMZaAg==","signedAt":"2026-06-18T12:19:03.389Z","signedBy":"unfragile.ai","version":1},"_links":{"self":"https://unfragile.ai/api/v1/passport/mailru--easyjson","artifact":"https://unfragile.ai/mailru--easyjson","verify":"https://unfragile.ai/api/v1/verify?slug=mailru--easyjson","publicKey":"https://unfragile.ai/api/v1/trust-passport-public-key","spec":"https://unfragile.ai/trust","schema":"https://unfragile.ai/schema.json","docs":"https://unfragile.ai/docs"}}