About Jpx
Jpx is an MCP server published by joshrotenberg in the Developer Tools category: jMESPath CLI and MCP server with 460+ extended functions.
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Install
git clone https://github.com/joshrotenberg/jpxThis server has no ConduID identity, so agent calls to it are not receipted. Pin the version you install and review the source before granting it credentials.
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README
jpx
JMESPath CLI and tools with 400+ extended functions - a powerful jq alternative.
This repository contains the jpx ecosystem:
| Package | Description |
|---|---|
| jpx | CLI tool with REPL, multiple output formats |
| jpx-mcp | MCP server for AI assistants |
| jpx-engine | Query engine with introspection and discovery |
Quick Start
# Install
brew install joshrotenberg/brew/jpx
# or: cargo install jpx
# Use it
echo '{"name": "world"}' | jpx 'upper(name)'
# "WORLD"
curl -s https://api.github.com/users/octocat | jpx '{
login: login,
created: format_date(parse_date(created_at), `%B %Y`)
}'
# {"login": "octocat", "created": "January 2011"}
Docker
# CLI
echo '{"name": "world"}' | docker run -i ghcr.io/joshrotenberg/jpx 'upper(name)'
# MCP Server
docker run -i --rm ghcr.io/joshrotenberg/jpx-mcp
MCP Server
Give Claude (or any MCP client) the ability to query and transform JSON:
{
"mcpServers": {
"jpx": {
"command": "jpx-mcp"
}
}
}
Tools: evaluate, batch_evaluate, validate, functions, describe, search, similar, format, diff, patch, merge, stats, paths, keys
Function Categories
The library provides 400+ functions across these categories:
| 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 the documentation for the full function reference.
Acknowledgments
- JMESPath - The query language specification
- jmespath.rs - Rust implementation by @mtdowling
- jpx-core - JMESPath implementation with 400+ extension functions
License
MIT or Apache-2.0
README copy captured when this server was indexed; it may lag the repository. The original is authoritative.