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The jq tool for parsing json format under linux the jq tool will read the json file better. In addition, the jq tool also checks the validity of the json file behind the back. if there is a format error in the file, jq will also report the location where the error exists. Chapter 1, introduction to jq, installation of jq tools under linux use jq tool in sudo apt-get install jq-yvim

Be careful to back up the json file in advance, as this operation will modify the file directly

Used in the last line mode of vim

:%! jq'. Chapter II basic use of the jq tool under linux 1. Check the validity of the format of the json file. If there is an error in the format of the json file, it will report the location of the error, such as: "url" parse error: Expected string key before':'at line 1, column 62, display all the contents of the json file cat json | jq. 3, get the value of Value through Key | jq '.name'

When parsing an element key that does not exist, it returns null.

4. Nested parsing

Case 1

Cat json_area.txt | jq '.location.state' "Beijin"

Case 2

$cat jsondemo [{"sha": "7b81a836c31500e685d043729259affa8b670a87", "commit": {"author": {"name": "William Langford", "email": "wlangfor@gmail.com", "date": "2017-06-19T14:55:26Z"}] $cat jsondemo | jq'. [0] .sha'"7b81a836c31500e685d043729259affa8b670a87" 5, built-in function

Jq has some built-in functions, such as has,key, etc. The key function is used to obtain the Key in json.

Jq 'keys' json_file

Has determines whether there is a Key in the json file

Cat json_raw.txt | jq 'has ("name")' truecat json_raw.txt | jq 'has ("noexisted")' false Thank you for reading! this is the end of the article on "how to use the jq tool for parsing json format under linux". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it for more people to see!

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