jpx
About
JMESPath query tool with 320+ extended functions for JSON transformation and analysis
Details
- Author
- joshrotenberg
- Categories
- Developer Tools, Other
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Setup
Install jpx in your MCP client (Claude Desktop, Cursor, Windsurf, and others).
Repository: https://github.com/joshrotenberg/jmespath-extensions
Follow the installation instructions in the repository README, then restart your MCP client.
This work has moved tohttps://github.com/joshrotenberg/jpxwhich includes a fullJMESPath Specificationimplementation with some performance improvements over the official crate, the full extensions (plus more) implemented here, a higher level "engine" library that includes meta for both evaluation and function discovery, and thejpxCLI tool and thejpx-mcpMCP server.
No further development will be done on this repository.
Extended JMESPath with 400+ functions. Rust library and Python bindings.
[dependencies] jmespath_extensions = "0.9"
use jmespath_extensions::search; use serde_json::json; let data = json!({"items": [1, 2, 3, 4, 5]}); let result = search("sum(items)", &data)?; assert_eq!(result, json!(15)); // String functions let data = json!({"name": "alice"}); let result = search("upper(name)", &data)?; assert_eq!(result, json!("ALICE")); // Date functions let result = search("format_date(now(), '%Y-%m-%d')", &json!({}))?; // Array functions let data = json!({"values": [1, 2, 2, 3, 3, 3]}); let result = search("unique(values)", &data)?; assert_eq!(result, json!([1, 2, 3]));
import jmespath_extensions as jmx # Basic usage data = {"items": [1, 2, 3, 4, 5]} result = jmx.search("sum(items)", data) assert result == 15 # String functions result = jmx.search("upper(name)", {"name": "alice"}) assert result == "ALICE" # Array functions result = jmx.search("unique(values)", {"values": [1, 2, 2, 3]}) assert result == [1, 2, 3]
Seedocs.rsfor the full function reference.
- jpx- CLI, MCP server, and query engine built on this library
- JMESPath- The query language specification
- jmespath.rs- Rust JMESPath implementation
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