elastic / micro-jq

A small implementation of JQ

micro-jq

A small implementation of JQ.

What is it?

jq is a fantastic tool for wrangling JSON, but it's written in C and so cannot be used in a browser. This project implements a subset of the JQ filter language, and is intended for simple filtering jobs in JavaScript where the filter is supplied e.g. by a user.

How does it work?

It uses a parsed expression grammar (via Peggy) to transform JQ expressions into a series of "op codes", with each one representing a JQ filter operation. Each op code is executed with a context, which is initialised with the input object. As each op code executes, the context is updated.

Goals

• Implement enough of the JQ syntax to be useful
• Implement it the same as JQ

Non-goals

• Complete implementation of JQ (but the level of completeness may increase over time).

micro-jq's Issues

Support for length and select

Great work on micro-jq!

Would be great if you could add support for length and select.

boolean expression evaluation

Hello,

I added a generic boolean expression evaluation feature adapted from https://github.com/hashicorp/js-bexpr/

You can check it here https://github.com/pnocera/micro-jq if it's of any interest.

example usage in the tests here
https://github.com/pnocera/micro-jq/blob/main/test/evaluate.test.ts

Thanks