Jaqx

Listing Results Jaqx

Frequently Asked Questions

• How are JQ filters written to standard out?

  jq filters run on a stream of JSON data. The input to jq is parsed as a sequence of whitespace-separated JSON values which are passed through the provided filter one at a time. The output (s) of the filter are written to standard out, again as a sequence of whitespace-separated JSON data. Note: it is important to mind the shell's quoting rules.

• Which is the development version of the JQ program?

  jq Manual (development version) For released versions, see jq 1.6, jq 1.5, jq 1.4 or jq 1.3. A jq program is a "filter": it takes an input, and produces an output. There are a lot of builtin filters for extracting a particular field of an object, or converting a number to a string, or various other standard tasks.

• How can I change how JQ reads and writes JSON?

  You can affect how jq reads and writes its input and output using some command-line options: Output the jq version and exit with zero. Use the application/json-seq MIME type scheme for separating JSON texts in jq's input and output.

• How is JQ used to parse large JSON files?

  With the --stream option jq can parse input texts in a streaming fashion, allowing jq programs to start processing large JSON texts immediately rather than after the parse completes. If you have a single JSON text that is 1GB in size, streaming it will allow you to process it much more quickly.

• What should I know about the JQ manual?

  jq Manual (development version) 1 Invoking jq. ... 2 Basic filters. ... 3 Types and Values. ... 4 Builtin operators and functions. ... 5 Conditionals and Comparisons. ... 6 Regular expressions (PCRE) FILTER is one of test, match, or capture, as described below. ... 7 Advanced features. ... 8 Math. ... 9 I/O. ... 10 Streaming. ... More items...

• Where can I find the documentation for JQ?

  If you want to learn to use jq, read the documentation at https://stedolan.github.io/jq. This documentation is generated from the docs/ folder of this repository. You can also try it online at jqplay.org. If you want to hack on jq, feel free, but be warned that its internals are not well-documented at the moment.

• What makes a JQ program a " filter "?

  A jq program is a “filter”: it takes an input, and produces an output. There are a lot of builtin filters for extracting a particular field of an object, or converting a number to a string, or various other standard tasks.

• What do I need to build JQ from Git?

  If you're building directly from the latest git, you'll need flex, bison (3.0 or newer), libtool, make, automake, and autoconf installed. To get regexp support you'll also need to install Oniguruma or clone it as a git submodule as per the instructions below. (note that jq's tests require regexp support to pass).