jpx-core

A complete JMESPath implementation for Rust, built directly on serde_json::Value, with 490+ extension functions beyond the standard specification.

This is a from-scratch implementation with no dependency on the unmaintained jmespath crate. It provides the parser, interpreter, runtime, and function registry used across the jpx ecosystem.

Install

[dependencies]
jpx-core = "0.2"
serde_json = "1"

Quick start

use jpx_core::compile;
use serde_json::json;

let expr = compile("foo.bar").unwrap();
let data = json!({ "foo": { "bar": true } });
assert_eq!(expr.search(&data).unwrap(), json!(true));

Highlights

Works natively with serde_json::Value -- no Variable type or conversion overhead
26 standard JMESPath built-ins plus 490+ extensions across 32 categories
functions.toml is the single source of truth for function metadata; the registry, documentation, and compliance tests are generated from it at build time
JEP-18 let expressions (let $x = expr in body)

Features

extensions (default) -- the 490+ extension functions
let-expr (default) -- JEP-18 let expression support

Build with default-features = false for a lean, spec-only JMESPath engine.

License