rsonpath-syntax – JSONPath parser

Complete, fast, and fully spec-compliant JSONPath query parser.

Usage

Parse a query to its AST with the parse function.

let query = rsonpath_syntax::parse("$.jsonpath[*]")?;

For advanced usage consult the crate documentation.

Feature flags

There are three optional features:

• arbitrary, which enables a dependency on the arbitrary crate to provide Arbitrary implementations on query types; this is used e.g. for fuzzing.
• color, which enables a dependency on the owo_colors crate to provide colorful Display representations of ParseError with the colored function.
• serde, which enables a dependency on the serde crate to provide serialization and deserialization of JsonPathQuery and all the underlying types.

Examples

There are two examples programs, builder showcases usage of the JsonPathQueryBuilder struct; cli is a small CLI tool that takes one argument, a query to parse, and prints a debug representation of the result query, or an error message – this is useful for debugging when developing the crate itself.

State of the crate

This is an in-development version that supports only name, index, and wildcard selectors. However, these are fully supported, tested, and fuzzed. The planned roadmap is:

• support slices
• support filters (without functions)
• support functions (including type check)
• polish the API
• 1.0.0 stable release

Dependencies

Showing direct dependencies.

cargo tree --package rsonpath-lib --edges normal --depth 1 --target=all --all-features

rsonpath-syntax v0.4.0 (/home/mat/src/rsonpath/crates/rsonpath-syntax)
├── arbitrary v1.4.1
├── nom v7.1.3
├── owo-colors v4.1.0
├── serde v1.0.217
├── thiserror v2.0.9
└── unicode-width v0.2.0

Justification

• arbitrary – optional Arbitrary support for fuzzing.
• nom – combinator-based parsing used throughout the crate.
• owo-colors – optional feature for pretty error messages.
• serde – optional dependency for serialization and deserialization of compiled engines.
• thiserror – idiomatic Error implementations.
• unicode-width – used to display error messages correctly in presence of wider Unicode characters in the query string.