Use this in conjunction withįiltering and the reduce and foreach syntax to reduce large inputs incrementally. This is useful for processing very large inputs. (scalars and empty arrays or empty objects). Parse the input in streaming fashion, outputing arrays of path and leaf values This more also parses the output of jq without the JSON texts that fail to parse are ignored (but warned about), discarding all This means that an ASCII RS (record separator) character is printed beforeĮach value on output and an ASCII LF (line feed) is printed after every output. Use the application/json-seq MIME type scheme for separating JSON texts in jq´s inputĪnd output. Output the jq version and exit with zero. You can affect how jq reads and writes its input and output using some command-line Use double quotes around your jq program when given on the command-line (instead of the -f program-file option), but then double-quotes in the jq program need backslash escaping. When using the Windows command shell (cmd.exe) it´s best to Most Unix shells because that will be the same as jq foo, which will generally failīecause foo is not defined. Special meaning to jq are also shell meta-characters. As a general rule it´s best toĪlways quote (with single-quote characters) the jq program, as too many characters with Note: it is important to mind the shell´s quoting rules. The output(s) of the filter are written to standard out, again as a sequence of Whitespace-separated JSON values which are passed through the provided filter one at a The input to jq is parsed as a sequence of feeding the input array both to the add filter and the length filter and then performingīut that´s getting ahead of ourselves. So, you can implement an averaging filter as add / length Operations that combine two filters, like addition, generally feed the same input Like "hello" or 42 are filters - they take an input but always produce the same literal as It´s important to remember that every filter has an input and an output. In other languages are just done by gluing filters together in jq. Generally, things that would be done with loops and iteration Piping that filter into a second runs the second filter forĮach element of the array. Some filters produce multiple results, for instance there´s one that produces all theĮlements of its input array. There are a lot ofīuiltin filters for extracting a particular field of an object, or converting a number toĪ string, or various other standard tasks.įilters can be combined in various ways - you can pipe the output of one filter intoĪnother filter, or collect the output of a filter into an array. The filter is written in the jq language and specifies how to transform theĪ jq program is a "filter": it takes an input, and produces an output. The options are described in the INVOKING JQ section they mostly concern input and outputįormatting. One or more files may be specified, in whichĬase jq will read input from those instead. Whitespace is only needed to separateĮntities such as 1 and 2, and true and false. (including numbers and other literals) from stdin. Jq can accept text input as well, but by default, jq reads a stream of JSON entities Take an array of JSON objects as input and return the sum of their "price" fields. For instance, running the command jq ´map(.price) | add´ will Jq can transform JSON in various ways, by selecting, iterating, reducing and otherwise
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