Strongly typed JSON library for Rust
This report summarizes scanner evidence for serde-rs/json, a Rust project with 5,644 GitHub stars. SynthScan examined 24,185 lines of code across 78 source files, recording 189 pattern matches distributed across 2 syntactic categories. The legacy adjusted pattern signal is 7.3 (Moderate 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.
Can maintainers explain intent, assumptions, and trade-offs? 172 finding(s).
Are imports declared and package/API names verified? 17 finding(s).
Are wrappers, guards, and repeated structures necessary? 0 finding(s).
Which changes need focused human review? 189 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 189 distinct pattern matches across 2 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 | Cargo.toml | 61 | # Make serde_json::Map use a representation which maintains insertion order. | COMMENT |
| LOW | Cargo.toml | 81 | arbitrary_precision = [] | COMMENT |
| LOW | src/number.rs | 161 | /// Represents the number as f64 if possible. Returns None otherwise. | COMMENT |
| LOW | src/number.rs | 221 | } | COMMENT |
| LOW | src/number.rs | 281 | COMMENT | |
| LOW | src/error.rs | 101 | pub fn is_data(&self) -> bool { | COMMENT |
| LOW | src/error.rs | 121 | /// use std::io::{self, ErrorKind, Read}; | COMMENT |
| LOW | src/error.rs | 141 | /// Err(error) => { | COMMENT |
| LOW | src/error.rs | 181 | /// | COMMENT |
| LOW | src/error.rs | 201 | /// } | COMMENT |
| LOW | src/lib.rs | 1 | //! # Serde JSON | COMMENT |
| LOW | src/lib.rs | 21 | //! There are three common ways that you might find yourself needing to work | COMMENT |
| LOW | src/lib.rs | 41 | //! representation. This data structure is [`serde_json::Value`][value]. | COMMENT |
| LOW | src/lib.rs | 61 | //! | COMMENT |
| LOW | src/lib.rs | 81 | //! println!("Please call {} at the number {}", v["name"], v["phones"][0]); | COMMENT |
| LOW | src/lib.rs | 101 | //! containing a JSON string and its JSON representation is `"John Doe"`. | COMMENT |
| LOW | src/lib.rs | 121 | //! use serde::{Deserialize, Serialize}; | COMMENT |
| LOW | src/lib.rs | 141 | //! }"#; | COMMENT |
| LOW | src/lib.rs | 161 | //! automatically interpret the input data as a `Person` and produce informative | COMMENT |
| LOW | src/lib.rs | 181 | //! | COMMENT |
| LOW | src/lib.rs | 201 | //! ``` | COMMENT |
| LOW | src/lib.rs | 221 | //! "name": full_name, | COMMENT |
| LOW | src/lib.rs | 241 | //! | COMMENT |
| LOW | src/lib.rs | 261 | //! | COMMENT |
| LOW | src/lib.rs | 281 | //! without the rest of the Rust standard library. Disable the default "std" | COMMENT |
| LOW | src/raw.rs | 21 | /// | COMMENT |
| LOW | src/raw.rs | 41 | /// #[derive(Deserialize)] | COMMENT |
| LOW | src/raw.rs | 61 | /// let input: Input = serde_json::from_str(input)?; | COMMENT |
| LOW | src/raw.rs | 81 | /// The typical usage of `RawValue` will be in the borrowed form: | COMMENT |
| LOW | src/raw.rs | 101 | /// | COMMENT |
| LOW | src/raw.rs | 181 | /// except that we avoid an allocation and memcpy if both of the following | COMMENT |
| LOW | src/raw.rs | 201 | /// | COMMENT |
| LOW | src/raw.rs | 221 | /// // SAFETY: `json` was produced by serde_json's own serializer, so it is | COMMENT |
| LOW | src/raw.rs | 241 | /// ``` | COMMENT |
| LOW | src/raw.rs | 281 | /// Convert a `T` into a boxed `RawValue`. | COMMENT |
| LOW | src/raw.rs | 301 | /// b: u32, | COMMENT |
| LOW | src/raw.rs | 321 | /// This conversion can fail if `T`'s implementation of `Serialize` decides to | COMMENT |
| LOW | src/ser.rs | 1681 | /// correctly formatted but unspecified numerical value. | COMMENT |
| LOW | src/ser.rs | 1701 | /// | COMMENT |
| LOW | src/ser.rs | 2181 | { | COMMENT |
| LOW | src/de.rs | 41 | impl<'de, R> Deserializer<R> | COMMENT |
| LOW | src/de.rs | 161 | StreamDeserializer { | COMMENT |
| LOW | src/de.rs | 181 | /// *This method is only available if serde_json is built with the | COMMENT |
| LOW | src/de.rs | 201 | /// carefully_drop_nested_arrays(value); | COMMENT |
| LOW | src/de.rs | 1561 | /// whether the bytes represent a valid UTF-8 string. | COMMENT |
| LOW | src/de.rs | 1581 | /// | COMMENT |
| LOW | src/de.rs | 1601 | /// | COMMENT |
| LOW | src/de.rs | 1621 | /// use serde_bytes::ByteBuf; | COMMENT |
| LOW | src/de.rs | 2341 | /// | COMMENT |
| LOW | src/de.rs | 2401 | /// let de = serde_json::Deserializer::from_slice(data); | COMMENT |
| LOW | src/de.rs | 2521 | /// | COMMENT |
| LOW | src/de.rs | 2541 | /// # Example | COMMENT |
| LOW | src/de.rs | 2561 | /// let file = File::open(path)?; | COMMENT |
| LOW | src/de.rs | 2581 | /// ``` | COMMENT |
| LOW | src/de.rs | 2601 | /// fn main() { | COMMENT |
| LOW | src/de.rs | 2621 | /// type. | COMMENT |
| LOW | src/de.rs | 2641 | /// fingerprint: String, | COMMENT |
| LOW | src/de.rs | 2661 | /// structure expected by `T`, for example if `T` is a struct type but the input | COMMENT |
| LOW | src/de.rs | 2681 | /// #[derive(Deserialize, Debug)] | COMMENT |
| LOW | src/de.rs | 2701 | /// | COMMENT |
| 112 more matches not shown… | ||||
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | README.md | 30 | "name": "John Doe", | CODE |
| LOW | README.md | 94 | "name": "John Doe", | CODE |
| LOW | README.md | 120 | the output looks like `Please call "John Doe" at the number "+44 1234567"`. The | CODE |
| LOW | README.md | 122 | string and its JSON representation is `"John Doe"`. Printing as a plain string | CODE |
| LOW | README.md | 162 | "name": "John Doe", | CODE |
| LOW | README.md | 222 | "name": "John Doe", | CODE |
| LOW | README.md | 252 | let full_name = "John Doe"; | CODE |
| LOW | src/lib.rs | 8 | //! "name": "John Doe", | COMMENT |
| LOW | src/lib.rs | 69 | //! "name": "John Doe", | COMMENT |
| LOW | src/lib.rs | 99 | //! above, the output looks like `Please call "John Doe" at the number "+44 | COMMENT |
| LOW | src/lib.rs | 101 | //! containing a JSON string and its JSON representation is `"John Doe"`. | COMMENT |
| LOW | src/lib.rs | 135 | //! "name": "John Doe", | COMMENT |
| LOW | src/lib.rs | 188 | //! "name": "John Doe", | COMMENT |
| LOW | src/lib.rs | 216 | //! let full_name = "John Doe"; | COMMENT |
| LOW | src/value/mod.rs | 14 | //! "name": "John Doe", | COMMENT |
| LOW | src/value/mod.rs | 42 | //! let full_name = "John Doe"; | COMMENT |
| LOW | src/value/mod.rs | 68 | //! "name": "John Doe", | COMMENT |