This work has moved to https://github.com/joshrotenberg/jpx which includes a full JMESPath Specification
implementation 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 the jpx CLI tool and the jpx-mcp MCP 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"pip install jmespath-extensionsuse 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]| Category | Examples |
|---|---|
| String | upper, lower, split, replace, camel_case, pad_left |
| Array | first, last, unique, chunk, zip, flatten, group_by |
| Math | round, sqrt, median, stddev, percentile |
| Date/Time | now, parse_date, format_date, date_add, date_diff |
| Hash | md5, sha256, hmac_sha256, crc32 |
| Encoding | base64_encode, base64_decode, hex_encode, url_encode |
| Regex | regex_match, regex_extract, regex_replace |
| Geo | haversine, geo_distance_km, geo_bearing |
| Network | cidr_contains, is_private_ip, ip_to_int |
| JSON Patch | json_patch, json_merge_patch, json_diff |
| Fuzzy | levenshtein, jaro_winkler, soundex, metaphone |
| Expression | map_expr, filter_expr, sort_by_expr, group_by_expr |
See docs.rs for 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
MIT or Apache-2.0