Parsing gigabytes of JSON per second : used by Facebook/Meta Velox, the Node.js runtime, ClickHouse, WatermelonDB, Apache Doris, Milvus, StarRocks
This report summarizes scanner evidence for simdjson/simdjson, a C++ project with 24,488 GitHub stars. SynthScan examined 157,803 lines of code across 726 source files, recording 548 pattern matches distributed across 13 syntactic categories. The legacy adjusted pattern signal is 3.6 (Low pattern signal); it is not an authorship estimate.
Use the findings to ask whether maintainers can explain intent, verify dependencies, simplify unnecessary scaffolding, and focus review effort. Risk Payload v1 adds ownership, supply-chain, over-engineering, and review-effort vectors when available. These are prompts for human verification, not probabilities, security findings, or measured maintenance costs.
Use each vector to guide manual verification of the underlying findings.
Payload schema: 1.0.0 · Engine: 2.0.0 · Scoring: heuristic-density-v1 · Scan date: 2026-10-31.
Can maintainers explain intent, assumptions, and trade-offs? 521 finding(s).
Are imports declared and package/API names verified? 23 finding(s).
Are wrappers, guards, and repeated structures necessary? 7 finding(s).
Which changes need focused human review? 548 finding(s).
This chart tracks the legacy adjusted pattern score across scan runs. Changes can reflect source changes, scan coverage, or detector/scoring versions; they do not measure AI adoption or prove that a team refactored code. Compare runs only when their scoring versions are compatible. The dashed line tracks the raw pattern-hit count.
Groups findings by configured severity weight. Severity is not a confidence estimate, security rating, or proof that a package is missing. Verify imports against the project's manifests and inspect each finding in its local design context.
This horizontal bar chart shows where configured pattern scores accumulate across directories. Treat the bars as locations to inspect, not as evidence of authorship or code quality. Use the file-level findings to decide whether a directory needs a focused ownership, dependency, complexity, or review check.
The scanner identified 548 distinct pattern matches across 13 syntactic categories. Each entry below represents a discrete location in the source code where the engine recorded a detector match to inspect in context. Expand any category row to inspect the individual file paths, line numbers, code snippets, and the lexical context (CODE, COMMENT, or STRING) in which each match was detected.
Reading the findings table: The Severity column indicates the configured finding weight (CRITICAL / HIGH / MEDIUM / LOW). The Context column identifies whether the match occurred inside executable code, an inline comment, or a string literal — legacy comment-context matches receive a ×1.5 score weight. The ⚡ bolt icon marks clustered matches: three or more patterns within a 10-line window, each receiving an additional ×1.5 density multiplier under the legacy scoring model.
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | CMakeLists.txt | 61 | # simdjson.h/simdjson.cpp, who never run CMake. | COMMENT |
| LOW | benchmark/benchmarker.h | 1 | #ifndef __BENCHMARKER_H | COMMENT |
| LOW | benchmark/benchmarker.h | 21 | #include <chrono> | COMMENT |
| LOW | benchmark/benchmarker.h | 261 | event_collector& collector; | COMMENT |
| LOW | benchmark/bench_number_accessors.cpp | 1 | #include <atomic> | COMMENT |
| LOW | benchmark/benchfeatures.cpp | 1 | #include <counters/event_counter.h> | COMMENT |
| LOW | benchmark/benchfeatures.cpp | 21 | #include <iomanip> | COMMENT |
| LOW | benchmark/bench_ondemand.cpp | 1 | #include "simdjson.h" | COMMENT |
| LOW | benchmark/bench_ondemand.cpp | 21 | #include <nlohmann/json.hpp> | COMMENT |
| LOW | benchmark/bench_ondemand.cpp | 41 | COMMENT | |
| LOW | benchmark/bench_ondemand.cpp | 61 | #include "distinct_user_id/simdjson_ondemand_json_pointer.h" | COMMENT |
| LOW | benchmark/bench_ondemand.cpp | 81 | #if SIMDJSON_COMPETITION_ONDEMAND_SAJSON | COMMENT |
| LOW | benchmark/bench_ondemand.cpp | 101 | #if SIMDJSON_COMPETITION_SAX | COMMENT |
| LOW | benchmark/bench_ondemand.cpp | 121 | #include "kostya/nlohmann_json.h" | COMMENT |
| LOW | benchmark/bench_ondemand.cpp | 141 | #include "large_random/nlohmann_json.h" | COMMENT |
| LOW | benchmark/distinct_user_id/rapidjson_sax.h | 61 | #endif // SIMDJSON_COMPETITION_RAPIDJSON | COMMENT |
| LOW | …ecipe_book_benchmark/benchmark_parsing_recipe_book.cpp | 1 | #include <cstdio> | COMMENT |
| LOW | …eflect/twitter_benchmark/benchmark_parsing_twitter.cpp | 1 | #include <cassert> | COMMENT |
| LOW | …/twitter_benchmark/benchmark_serialization_twitter.cpp | 1 | #include <cassert> | COMMENT |
| LOW | benchmark/static_reflect/serde-benchmark/lib.rs | 241 | // FFI Overhead Measurement Functions | COMMENT |
| LOW | …log_benchmark/benchmark_serialization_citm_catalog.cpp | 1 | #include <cassert> | COMMENT |
| LOW | …lect/citm_catalog_benchmark/benchmark_parsing_citm.cpp | 1 | #include <cassert> | COMMENT |
| LOW | benchmark/partial_tweets/tweet.h | 1 | #pragma once | COMMENT |
| LOW | benchmark/dom/perfdiff.cpp | 1 | #include <cstdio> | COMMENT |
| LOW | benchmark/dom/parse.cpp | 1 | #include <counters/event_counter.h> | COMMENT |
| LOW | benchmark/dom/parse.cpp | 21 | #include <iostream> | COMMENT |
| LOW | tools/vendor_fast_float.sh | 1 | #!/bin/sh | COMMENT |
| LOW | tools/vendor_fast_float.sh | 61 | // fast_float's bigint comparison is several times quicker than the | COMMENT |
| LOW | tools/minify.cpp | 1 | #include <chrono> | COMMENT |
| LOW | tools/json2json.cpp | 1 | #include <iostream> | COMMENT |
| LOW | include/simdjson.h | 41 | #include "simdjson/simdjson_version.h" | COMMENT |
| LOW | include/simdjson.h | 61 | #include "simdjson/compile_time_json.h" | COMMENT |
| LOW | include/simdjson/builtin.h | 1 | #ifndef SIMDJSON_BUILTIN_H | COMMENT |
| LOW | include/simdjson/builtin.h | 21 | #elif SIMDJSON_BUILTIN_IMPLEMENTATION_IS(westmere) | COMMENT |
| LOW | include/simdjson/fallback.h | 1 | #ifndef SIMDJSON_FALLBACK_H | COMMENT |
| LOW | include/simdjson/dom.h | 1 | #ifndef SIMDJSON_DOM_H | COMMENT |
| LOW | include/simdjson/dom.h | 21 | #include "simdjson/internal/tape_ref-inl.h" | COMMENT |
| LOW | include/simdjson/ppc64.h | 1 | #ifndef SIMDJSON_PPC64_H | COMMENT |
| LOW | include/simdjson/annotations.h | 161 | inline constexpr detail::is_empty_t is_empty{}; | COMMENT |
| LOW | include/simdjson/annotations.h | 181 | // default behaviour is used in that direction. | COMMENT |
| LOW | include/simdjson/rvv-vls.h | 1 | #ifndef SIMDJSON_RVV_VLS_H | COMMENT |
| LOW | include/simdjson/haswell.h | 1 | #ifndef SIMDJSON_HASWELL_H | COMMENT |
| LOW | include/simdjson/convert-inl.h | 121 | #endif // SIMDJSON_SUPPORTS_CONCEPTS | COMMENT |
| LOW | include/simdjson/icelake.h | 1 | #ifndef SIMDJSON_ICELAKE_H | COMMENT |
| LOW | include/simdjson/portability.h | 1 | #ifndef SIMDJSON_PORTABILITY_H | COMMENT |
| LOW | include/simdjson/portability.h | 41 | COMMENT | |
| LOW | include/simdjson/portability.h | 61 | COMMENT | |
| LOW | include/simdjson/portability.h | 81 | // We are not using GCC, so we assume that we can support runtime dispatch for LASX. | COMMENT |
| LOW | include/simdjson/portability.h | 101 | #elif defined(__PPC__) || defined(_M_PPC) | COMMENT |
| LOW | include/simdjson/portability.h | 121 | #define SIMDJSON_STRINGIFY(a,...) SIMDJSON_CAT_IMPLEMENTATION_(a, __VA_ARGS__) | COMMENT |
| LOW | include/simdjson/portability.h | 141 | // | COMMENT |
| LOW | include/simdjson/portability.h | 161 | #endif // defined(SIMDJSON_IS_X86_64) || defined(SIMDJSON_IS_LSX) | COMMENT |
| LOW | include/simdjson/portability.h | 181 | // Lack of compiler optimization may generate high stack usage. | COMMENT |
| LOW | include/simdjson/portability.h | 201 | #define simdjson_pure | COMMENT |
| LOW | include/simdjson/portability.h | 221 | #define simdjson_strncasecmp _strnicmp | COMMENT |
| LOW | include/simdjson/portability.h | 241 | #endif | COMMENT |
| LOW | include/simdjson/portability.h | 261 | #elif defined(__MVS__) | COMMENT |
| LOW | include/simdjson/portability.h | 281 | #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ | COMMENT |
| LOW | include/simdjson/portability.h | 301 | // On Windows the class is disabled by default and must be explicitly | COMMENT |
| LOW | include/simdjson/portability.h | 321 | // simply does not exist -- any attempt to use it fails at compile time | COMMENT |
| 436 more matches not shown… | ||||
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | benchmark/benchmark_reflection_usage_compilation.sh | 322 | "name": "John Doe", | CODE |
| LOW | benchmark/benchmark_reflection_usage_compilation.sh | 327 | "street": "123 Main St", | CODE |
| LOW | benchmark/benchmark_reflection_usage_compilation.sh | 393 | "name": "John Doe", | CODE |
| LOW | benchmark/benchmark_reflection_usage_compilation.sh | 398 | "street": "123 Main St", | CODE |
| LOW | benchmark/accessor_performance/accessor_benchmark.h | 16 | "street": "123 Main St", | CODE |
| LOW | tests/ondemand/compile_time_json_path_tests.cpp | 47 | "name": "John Doe", | CODE |
| LOW | tests/ondemand/compile_time_json_path_tests.cpp | 58 | "street": "123 Main St", | CODE |
| LOW | tests/ondemand/compile_time_json_path_tests.cpp | 133 | ASSERT_EQUAL(name, "John Doe"); | CODE |
| LOW | tests/ondemand/compile_time_json_path_tests.cpp | 178 | ASSERT_EQUAL(street, "123 Main St"); | CODE |
| LOW | tests/ondemand/compile_time_json_pointer_tests.cpp | 47 | "name": "John Doe", | CODE |
| LOW | tests/ondemand/compile_time_json_pointer_tests.cpp | 96 | "street": "123 Main St", | CODE |
| LOW | tests/ondemand/compile_time_json_pointer_tests.cpp | 120 | ASSERT_EQUAL(name, "John Doe"); | CODE |
| LOW | tests/ondemand/compile_time_json_pointer_tests.cpp | 432 | ASSERT_EQUAL(street, "123 Main St"); | CODE |
| LOW | tests/ondemand/compile_time_json_pointer_tests.cpp | 527 | ASSERT_EQUAL(name, "John Doe"); | CODE |
| LOW | tests/builder/static_reflection_comprehensive_tests.cpp | 577 | Person person{"John Doe", 30, "john@example.com", std::nullopt}; | CODE |
| LOW | tests/builder/static_reflection_comprehensive_tests.cpp | 592 | ASSERT_EQUAL(name, "John Doe"); | CODE |
| LOW | tests/builder/static_reflection_comprehensive_tests.cpp | 598 | Person person{"Jane Smith", 25, "jane@example.com", "555-1234"}; | CODE |
| LOW | tests/builder/static_reflection_comprehensive_tests.cpp | 617 | ASSERT_EQUAL(phone, "555-1234"); | CODE |
| LOW | tests/builder/static_reflection_comprehensive_tests.cpp | 672 | Company company{"TechCorp", {"123 Main St", "San Francisco", "94105"}, 500}; | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW⚡ | …lude/simdjson/generic/builder/fractured_json_builder.h | 42 | // Step 1: Serialize to minified JSON | COMMENT |
| LOW⚡ | …lude/simdjson/generic/builder/fractured_json_builder.h | 49 | // Step 2: Reformat with FracturedJson | COMMENT |
| LOW⚡ | …lude/simdjson/generic/builder/fractured_json_builder.h | 73 | // Step 1: Extract fields to minified JSON | COMMENT |
| LOW⚡ | …lude/simdjson/generic/builder/fractured_json_builder.h | 80 | // Step 2: Reformat with FracturedJson | COMMENT |
| LOW⚡ | src/to_chars.cpp | 919 | // Step 1: Schubfach multiplier calculation. | COMMENT |
| LOW⚡ | src/to_chars.cpp | 928 | // Step 2: Try larger divisor; remove trailing zeros if necessary. | COMMENT |
| LOW | src/to_chars.cpp | 958 | // Step 3: Find the significand with the smaller divisor. | COMMENT |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW⚡ | …lude/simdjson/generic/builder/fractured_json_builder.h | 42 | // Step 1: Serialize to minified JSON | COMMENT |
| LOW⚡ | …lude/simdjson/generic/builder/fractured_json_builder.h | 49 | // Step 2: Reformat with FracturedJson | COMMENT |
| LOW⚡ | …lude/simdjson/generic/builder/fractured_json_builder.h | 73 | // Step 1: Extract fields to minified JSON | COMMENT |
| LOW⚡ | …lude/simdjson/generic/builder/fractured_json_builder.h | 80 | // Step 2: Reformat with FracturedJson | COMMENT |
| LOW⚡ | src/to_chars.cpp | 919 | // Step 1: Schubfach multiplier calculation. | COMMENT |
| LOW⚡ | src/to_chars.cpp | 928 | // Step 2: Try larger divisor; remove trailing zeros if necessary. | COMMENT |
| LOW | src/to_chars.cpp | 958 | // Step 3: Find the significand with the smaller divisor. | COMMENT |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | style/run-clang-format.py | 36 | CODE | |
| LOW | style/run-clang-format.py | 163 | CODE | |
| LOW | scripts/detect_nonascii_sourcefiles.py | 5 | CODE | |
| LOW | singleheader/amalgamate.py | 717 | CODE | |
| LOW | singleheader/amalgamate.py | 375 | CODE | |
| LOW | singleheader/amalgamate.py | 540 | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| HIGH | tools/release.py | 190 | print("to issue release, enter \n git commit -a && git push && git tag -a v"+toversionstring(*newversion)+" -m \"versi | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| HIGH | style/run-clang-format.py | 255 | except AttributeError: | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| MEDIUM | benchmark/benchmark_reflection_usage_compilation.sh | 57 | # ───────────────────────────── BOX-PRINT HELPER ──────────────────────────── | COMMENT |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | tools/release.py | 8 | CODE | |
| LOW | style/run-clang-format.py | 11 | CODE | |
| LOW | style/run-clang-format.py | 11 | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | style/run-clang-format.py | 97 | except Exception as e: | CODE |
| MEDIUM | style/run-clang-format.py | 91 | def run_clang_format_diff_wrapper(args, file): | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | style/run-clang-format.py | 91 | def run_clang_format_diff_wrapper(args, file): | CODE |
| LOW | singleheader/amalgamate.py | 375 | def validate_free_dependency_file(self): | STRING |
| LOW | singleheader/amalgamate.py | 423 | def validate_free_dependency_files(self): | STRING |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | benchmark/benchmark_reflection_usage_compilation.sh | 167 | # Check if we found a working compiler | COMMENT |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | fuzz/ossfuzz.sh | 9 | # make sure to exit on problems | COMMENT |