Bash json variable. native and "schemas" values.

Bash json variable Aug 7, 2023 · Here we learn how to read JSON file in Bash scripting. Get JSON objects for environment information Sep 8, 2022 · You'll need to complete a few actions and gain 15 reputation points before being able to upvote. Currently, my command looks like this kubectl get ingress -o json | jq -- Oct 7, 2022 · How to convert a multiple-line variable containing JSON to single line in shell? Asked 3 years, 1 month ago Modified 3 years, 1 month ago Viewed 1k times Jul 30, 2018 · I am trying to use bash to create a string variable that will be used in jq to add new elements to the json file. json file: Apr 26, 2021 · Throwing this all into a bash function The reason this has to be a function vs. It explains that combining the `-o` and `-P` flags enables intricate pattern matching with Perl-compatible regular expressions to effectively pull specific values from JSON. Assigning multiple variables in Bash using process substitution, i. What's reputation and how do I get it? Instead, you can save this post to reference later. Predefined variables The following predefined variables are supported: There are many blog posts on how to use tools like jq to filter JSON at the command line, but in this article I write about how you can actually use JSON to make your life easier in Bash with different variable assignment and loop techniques. stdin); Jan 1, 2020 · I am writing a bash script which has a json value stored in a variable now i want to extract the values in that json using Jq. Jan 27, 2018 · Advantage of this method is you can easily convert very complicated JSON Object (like object contains array, or if you need int value instead of string) to JSON String without worrying about invalid json error. It works if I provide the value to jq select, but the variable doesn't seem to work (or I don't know how to use it). For this purposes, I have a bash file, who creates json template file using cat: Oct 27, 2022 · Save a json value as variable Ask Question Asked 3 years ago Modified 3 years ago Jun 3, 2015 · I'm submitting a message to Mandrill in a bash script via their API and the content of the 'message' variable is causing the API call to come back with an error: An Jul 21, 2025 · LINUX | BASH | JSON | COMMAND LINE | DEVTOOLS | DEVOPS | SHELL SCRIPTING | SYSTEM ADMINISTRATOR Mastering JSON in Bash: A Complete Guide to jq Level Up Your Bash Skills with jq for Powerful JSON … message="Hello there" curl -X POST -H 'Content-type: application/json' --data '{"text": "${message}"}' This is outputting $ {message}, literally because it's inside a single quote. This can be done in several Tagged with linux, devops, json, bash. The example on stackoverflow (by chepner) May 16, 2023 · From time to time there is requirement build JSON object at bash script. One of the great things about jq is that it is written in portable C, and it has zero runtime dependencies. Let the variable jsonData hold example json (from another jq TIL) using the here-doc Jan 31, 2023 · Occasionally I want to POST human formatted JSON with curl, here's how to do that without using shell hacks or temp files. Oct 9, 2014 · If you need to print variables, use the cat << EOF construct, which utilizes the Here Document redirection built into Bash. The AWS cli command takes in a JSON string as a parameter. Second, using single quotes, bash won't do variable expansion: it won't replace $r_name with the variable content (see Expansion of variable inside single quotes in a command in bash shell script for more information). From installation to advanced usage, learn to parse, filter, and transform JSON data using jq in scripts. io/"8. Rather than trying to implement a JSON parser, you are likely better off using either a tool built for JSON parsing such as jq or a general purpose script language that has a JSON library. Each cURL statement relies on a variable generated from a cuRL statement executed befo Dec 29, 2015 · Another easy and more readable way to do this, you can use python, which exists in all linux based systems, to parse the json for you Simply, Import json and sys packages to load the json object, then print from the result object any property you need: curl ipinfo. Sep 21, 2021 · If you’re trying to build JSON using variables in your shell script you have no doubt seen the stackoverflow example. The JSON content type is set using the -H "Content-Type: application/json" command line parameter. sh, we can clone the Git repository or simply download it as an archive. One way to encode the string is by using jq: Oct 21, 2013 · mail=asa@xyz. Learn how to format the output of Azure CLI commands to tables, lists, or JSON. See man bash and search for "here document" for more information. It is often used for configuration files, API responses, and data exchange between systems. Discover techniques to handle JSON data effortlessly in your scripts with quick and clear examples. How do we do that? I tried {{user `java_version`}} but it did not work. Upvoting indicates when questions and answers are useful. But then I don't know how to make it into 77 and then put it back to the parameter of X_serial. Oct 26, 2017 · Are you just checking if the response is json, then running other commands? Or are you checking, then want to run filters on it? There are ways you could do that in pure jq, but it'll depend on what you want to do with after you check if it's json or not. Apr 7, 2012 · The question was - "how to escape characters in bash", so I have to stand up for the justice to us who want to do just that and have come here looking for it :) The problem is in encoding some e. Apr 3, 2023 · You can't take a shell variable and inject it into a JSON document without first properly JSON-encoding the variable's value. JSON, or JavaScript Object Notation, is widely usage due to its simplicity and ease of integration with various programming environments, especially for configuring applications and handling API responses. The code used is. using homebrew: brew install bash), so in the following I'll assume it's available, but you could just as well use the while read -r value technique to read values on a line-by-line basis. Jan 28, 2015 · I am having the file named loaded. This guide simplifies complex data manipulation into bite-sized, manageable steps. You can make the code that receives or reads it interpret it as something else, but that's something the code that reads the variable has to do; the variable is always a string. 8. json. false || true would not, since you are anticipating the non-zero exit status by specifying another command to run if the first fails. Explore concise steps to effortlessly handle JSON within your scripts. json")")" Note that this is not secure and malicious code can be inserted to the JSON file. I am expe Mar 9, 2023 · If your variable is a single string, as you show, including literal single quotes etc. I get the string dynamically by parsing a file which can vary in content and may contain regex characters and also new lines. "2". sh file. Aug 10, 2021 · 10055 10098 This can not be interpreted correctly from CURL. Transform JSON objects into Bash variables, arrays, and commands. Jan 30, 2018 · So, if the JSON is empty, i. Dec 19, 2023 · To post JSON data using Curl, you need to set the Content-Type of your request to application/json and pass the JSON data with the -d command line parameter. Jul 26, 2024 · Learn ways to handle and generate a nested JSON configuration from dynamic variables in Linux. How to pass variable to jq filters This is a generic projects. Here’s what it all means. Creating JSON from the command line or a shell script can be useful when: You need some ad-hoc JSON to interact with a JSON-consuming application You need to bundle up some data to share or move elsewhere. Mar 18, 2024 · Explore various ways we can add an object to a JSON array using jq. Using the –arg Option Apr 7, 2015 · You don't need to pass the quotes enclosing the custom headers to curl. All you need to do is to download a single binary or use a package manager like apt and install it with a single command. Mar 13, 2023 · If you want to pass a well-formed JSON document (your array) as a top-level key in a JSON document used with --data in your curl invocation, you may do as follows: get field from json and assign to variable in bash script? Asked 11 years, 5 months ago Modified 4 years, 11 months ago Viewed 53k times Mar 17, 2024 · In this article, you will learn how to convert a JSON array into an array in Bash to process data in Bash. See below for "wrong output" produced. How to do it In this case the Output for my shell command must give the result as "QAT" Formatted JSON for the scrolling-averse: { Aug 24, 2022 · I am forming a JSON dynamically during the pipeline run based on few pipeline parameters and pre-defined environment variables and trying to pass this JSON as an input in subsequent pipeline task. This article provides practical examples of how to improve your scripts with JSON. The jq utility knows how to encode a shell string correctly for use in a JSON document. Oct 30, 2017 · I have five cURL statements that work fine by themselves and am trying to put them together in a bash script. It is a lightweight format for storing and transporting data. Code: Nov 22, 2022 · You can then eval the output if you trust that the data provided is safe (we assume that the name is a valid variable name and that value is a scalar): $ unset -v SQS_URL Jan 17, 2020 · I have a command in a bash pipeline that returns me a JSON like the follow: $ aws iot get-registration-code { "registrationCode": "abcd635" } I would to have the value abcd635 inside a variabl 6 days ago · In this tutorial step, learn to work with variables: Execute an Azure CLI command and store output in a variable. Jul 16, 2018 · Working with JSON in bash using jq jq is a powerful tool that lets you read, filter, and write JSON in bash I'm trying to write a bash script with make s curl call and get a json document back. Jun 17, 2022 · Declare shell variable with JSON object, Parse and retrieve JSON data from shell variable. json which contains the below json data. json and tasks. Mar 24, 2021 · Yes sir, I'm a novice at bash scripting. Read a local JSON file and store property values in a variable. json Bash provides additional features, improved usability, and compatibility with various shell scripts. Dec 24, 2009 · The Python answer to this is to simply use a Python JSON library that will actually parse the JSON. Mar 23, 2021 · Thanks. However, as far as I know the output is always human readable form of JSON. Using --arg to create internal string variables from shell variables ensures that the values are correctly encoded (this avoids code injection vulnerabilities). What malicious code? Let's look into this properties. How can I make this work? Both environment variables and JSON strings are allowed to contain double-quotes, but the presence of one in the value of an environment variable will break your script. json | awk {print"$3"} which outputs 76. May 11, 2022 · How to append a json variable to another? Asked 3 years, 3 months ago Modified 3 years, 3 months ago Viewed 679 times Master the art of manipulating json in bash. This concise guide reveals essential commands and tips for seamless data handling. 2. A minor other thing is that your NAME variable actually happens to be an array due to the way you assign the value to it (NAME=()). The way for any program called by bash to "receive" the contents of an array would be to express it as a string, with field separators. However, within this json string I am using a variable $ Apr 22, 2022 · I'm using process substitution with <(echo "$json") in order to use the value of the $json variable with jq However, I feel that's not the most straightforward way of doing it. In this article, we will explore how to import data from a JSON file into a Bash script on Linux. JSON can a good alternative to base64 Aug 7, 2023 · Here we learn how to read JSON file in Bash scripting. Sep 21, 2024 · FOO_VAR=1 BAR_VAR=1 BAZ_VAR=1 I guess there are two steps: Convert JSON to a bash array Walk the bash array, munging each string and setting a variable I can probably do step 2, but I'm stuck on step 1. g. Many developers find themselves grappling with this task, but there’s a tool that can make this process a breeze. May 22, 2024 · To gain full voting privileges, Do I have a cleaner way to assign a parametrized json string to a bash variable? I'd like to prepare a test for a REST petstore server by the mean of curl. Aug 2, 2019 · How to send JSON as variable with bash curl? Ask Question Asked 6 years, 3 months ago Modified 5 years, 8 months ago Feb 26, 2021 · I would like to use this json file to get jenkins version and java version numbers to include my script. In bash, it only saves executing cat, bash still spawn an extra process. Dec 27, 2023 · Let‘s dig in and uncover why working with JSON is so popular within the Linux ecosystem… What Exactly Does "Loading a Local JSON File Into a Variable" Mean? Simply put, this process allows you to import JSON data from a file on your Linux machine into a variable that your scripts, apps, or commands can utilize programmatically. Variable substitution is supported inside some key and value strings in launch. May 20, 2021 · Setting variable inside curl JSON request with single quotes in bash Ask Question Asked 4 years, 6 months ago Modified 4 years, 6 months ago If some json keys are empty, you can then use 'jq' without '--raw' and remove the " 's afterwards with a=${a:1:-1}, or you can use readarray instead of read (cf. Mar 18, 2023 · jq is a de facto standard utility for working with JSON data in Linux. This saves you from all sort of headaches concerning shell quoting and makes it easier to read and maintain the script than feeding the post data on curl's invocation line as in Jun 23, 2023 · json. bash 's one thing is to get shell-native data (environment variables, files, program output) to somewhere else, using JSON encapsulate it robustly. We began by understanding the differences between how Bash and JSON handle data types, and the importance of JSON’s rigid syntax for consistency and error reduction. looping through JSON array in shell script. Aug 12, 2012 · If you're open to using Perl they have a 'open ()' function that will pipe a file with the json function 'to_json'. Ideal for handling API data or automating tasks, the article includes practical examples and further resources for deepening your jq skills. There are several ways to accomplish this task, depending on the specific The command instantiates three internal jq string variables with values taken from the shell variables that you have previously created. You also use your OUTPUT variable unquoted (which would split its contents on white-spaces and apply filename globbing to all the generated words) and with echo (which may Aug 14, 2021 · How can we know what to extract? Should it always be the second word from the first element in the the args array? Should it be whatever is after select\n? How can we identify the part of the file you want to extract? Jun 15, 2022 · I am having trouble getting the AWS cli working nicely with a bash variable. Sep 27, 2016 · It only saves spawning an extra process in ksh (where that syntax comes from) and zsh, not bash. if the password includes double quotes or backslashes or other characters that need encoding in JSON). com All the above need to be done in the bash script (. In summary, use: May 22, 2024 · I'd like to prepare a test for a REST petstore server by the mean of curl. Sep 17, 2019 · I am trying to download artifacts(. json files by using the $ {variableName} syntax. GitHub Gist: instantly share code, notes, and snippets. There are a few projects named json2env out there, this one attempts to meet the following goals: Runs under Alpine Linux Has only POSIX or busybox tools, plus jq as its preprequisites Runs under dash (busybox/alpine), bash, ksh and zsh May 19, 2021 · [$a,$b]|add For example, if $a and $b are initially JSON-valued shell variables: Oct 23, 2018 · bash $ Note: there's json irregularity in your file (size key is not present in every record), to exclude it the first argument -x is built that way (process only those records where size is present). Aug 12, 2024 · In this article, we explored several methods for converting Bash variables to a valid JSON string. It is often used when data is sent from a server to a web page. environment' "properties. First, write a function that generates the post data of your script. Master how to capture the bash curl result to variable effortlessly. By using --arg and --argjson options, variable expansion, and command line arguments, you can incorporate variables into your jq commands and perform customized JSON processing. Mar 18, 2023 · Passing a shell / bash variable / environment variable to jq is simple using the native functionality of: --arg name value or --argjson name value. false by itself, for instance, would exit the shell. I don't know how can I do this on bash, Is there a similar approach? Jul 19, 2018 · We are getting expected output for the below script if we parse the exact variable (solr. Nov 8, 2021 · I have a script where I am storing variables and using that I am trying to create a json output to a file. Feb 24, 2022 · Templating JSON data into a Variable, in Bash Building a JSON string in Bash can be pretty fiddly and annoying, with quoting and formatting and variable substitution, etc… If you only have a little JSON, using a printf template works well, like this: Oct 22, 2023 · JSON (JavaScript Object Notation) is a lightweight data interchange format widely used for representing structured data. Understanding Bash JSON Parsing Bash JSON parsing refers to the techniques used in the Bash environment to extract information from JSON data. example below). Oct 19, 2016 · I need, using bash script, create json file with some variables within. baseuri) name using jq command. , <(command) and using join with an empty string saved the day. By "unanticipated", I mean it runs in a context where you aren't specifically looking at its exit status. dynamic content (coming from a pretty formatted JSON file or a command output, or simply - any text at all) into a string field of a JSON to be sent to an API using Curl. I want to send a json request and embedd a variable in the post data. Some common use-cases for variables are: Get information about an existing Azure resource, such as a resource ID. JSON data is passed as a string. But it's escaping my double quote. I did a little research and I came up with the single quotes around the variable. The main issue is how do I store the key as a variable in bash? Mar 15, 2013 · set -e exits the shell if a command has an "unanticipated" non-zero exit status. The workaround is to assign a raw json string to variable, and using tools like jq to handle it during runtime. Nov 27, 2015 · Honestly, I think you'd be much more satisfied with a simple Python script. load(sys. The json document has a key called access_token and I need to extract the value of this field. To test its add new pet api, I prepare a json string that holds the Pet to insert in a bash function that executes the cur Unlock the power of data by mastering how to bash read json file. Think of Bash as a skilled linguist that can interpret JSON data, making it easier to handle. If some json keys are empty, you can then use 'jq' without '--raw' and remove the " 's afterwards with a=${a:1:-1}, or you can use readarray instead of read (cf. 8" 2>/dev/null | python -c 'import json,sys; result=json. Mar 5, 2020 · You'll need to complete a few actions and gain 15 reputation points before being able to upvote. Master the art of manipulating data with our guide on bash json to variable. This is my json I have written a script to retrieve certain value from file. Also, your variables in the middle of the data argument should be quoted. Discover streamlined methods to extract and leverage JSON data effortlessly. #!/bin/sh #t Nov 4, 2017 · I want to convert JSON string into an array in bash. Dec 31, 2017 · So, if desired variables are known, using this approach is the way to avoid multiple calls to jq to set a value per variable or even using the read statement with multiple variables in which some can be valid and empty, leading to a value shift (that was my problem). sh) I have already tried with the array iteration as but of no use Apr 18, 2023 · Sometimes I need to read multiple string values from json, and save them into their own variables as a pre-processing step. So the question is, how can I pass variables in a proper manner, in a sort of iteration, using JQ? Again, I need to do single calls using CURLs for each entry in the JSON file. JSON to Bash Converter Convert your JSON data to Bash script format with this simple online tool. The article provides practical examples but notes limitations such as handling complex JSON structures and May 10, 2024 · Generate a shell variable that holds the payload separately using a JSON-aware tool such as jq. The environment and your variables are removed when that shell or sub-shell terminates. JSON parsing is the procedure of converting Javascript Object Notation (JSON) into a format that the programming languages can interpret. war file) from artifactory through rest api. To parse JSON in shell scripting, there is no native support, but the jq command is used for this. When the bash scripting is dealing with APIs, it needs JSON parsing. If I change the quotes and put a double quote outside and a single quote inside, it says: command not found: Hello and then command not found: there. Feb 17, 2022 · Solved Note: a better way of doing this is saving the curl input as json and then using that with jq so you dont have to request stuff multiple times (sorry if this is a dumb question im new to bash and jq) Jul 8, 2017 · On a Mac, it's easy enough to install a bash with readarray (e. It is Mar 18, 2024 · JSON. Master the art of parsing JSON with bash jq. How do I pass variables that I’ve set in bash as arguments to curl’s command line option, say --data? Mar 8, 2016 · 1 This is basically what user suggested, inside a minimalist script! This uses no external programs but depends on bash! Your new json will be stored in the newStr variable. json response using shell script. Oct 27, 2021 · How do I insert a bash variable into the JSON body of a cURL request? Asked 4 years ago Modified 4 years ago Viewed 3k times The blog outlines how to extract JSON values using `grep -oP` in Bash when tools like `jq` are unavailable. Feb 18, 2023 · I am trying to submit a POST request using Bash that includes JSON data with a variable equal to that of a random string. 6 days ago · The Azure CLI offers various output formats such as JSON and YAML. json file: { "environment": "$(rm some_file)" } The shell will eval uate this code: echo This should convert a json array to a bash array regardless of the contents of the json entries. The issue is that the shell does not expand variables inside single-quoted strings. To test its add new pet api, I prepare a json string that holds the Pet to insert in a bash function that executes the curl: Jun 17, 2022 · JSON stands for J ava S cript O bject N otation. native and "schemas" values. Feb 26, 2021 · Option 2: Full shell expansion Other option, maybe better (but definitely NOT secure) is using eval: ENVIRONMENT="$(eval "echo $(jq -r '. Jan 11, 2019 · Above is my json response which is stored in a. Jun 26, 2019 · Pass variable within json payload in shell script Ask Question Asked 6 years, 4 months ago Modified 6 years, 4 months ago Mar 30, 2025 · Passing Bash variables to jq provides flexibility and dynamic processing capabilities when working with JSON data. Apr 28, 2022 · I know that jq can take serialized JSON strings to format/filter/modify the content. If jq is reading the environment, then a variable must be EXPORTed (in bash) to be visible, and requests to export arrays are silently ignored. Along the lines of Martin's suggestion of putting the JSON in a variable, you could also put the JSON in a separate file, and then supply the filename to -d using curl's @ syntax: The jq command-line tool is a lightweight and flexible command-line JSON processor. Is there a way of achieving it without using some temp Sep 8, 2017 · 8 First, your name property is a string, so you need to add double quotes to it in your json. Try storing it in a variable using a here doc or use something like jo to create it. To use JSON. May 22, 2024 · 1 The main issue in your initial attempts is that you set the environment variables in some other environment (the environment of the started sh shell in the first instance and the environment of the sub-shell that runs the while loop in the other instance). Update: With help from ChatGPT, I ended up with this. Nov 20, 2024 · Here are some examples of using the jq command-line utility to create new JSON data from scratch or update values in an existing JSON document. Jun 7, 2019 · Add bash variable as JSON key and value into object Ask Question Asked 6 years, 5 months ago Modified 4 years, 2 months ago Feb 8, 2019 · I want to modify the following json using variables specified in a Linux bash shell using jq. May 5, 2021 · Your json object is an escaping nightmare. And if you want to extract json you can use the 'from_json' function. Dec 20, 2023 · The safest way to create a JSON document from a set of shell variables is by using jq. Master the art of bash parse json without jq. Apr 24, 2018 · json string in bash variable Asked 7 years, 7 months ago Modified 7 years, 7 months ago Viewed 2k times Learn how to write complex multi-line strings to a variable in Bash efficiently and cleanly. You can even embed it into your shell script using heredoc syntax. Mar 9, 2022 · Json Variable Parameter can have object type like dict in Python, but not the case for variable. This ensures that each string value is encoded appropriately if needed (e. In this case we hardcode the json which presumably would have come from curl. Is there a way in Bash or jq itself, Apr 19, 2019 · I am trying to modify this using bash variables every time a new permission set is created and when databases are created. sh is a native shell project that claims compatibility with Ash, Bash, Dash, and Zsh, while arguably producing results that are easier to parse. It is great for parsing JSON output in BASH. For exmaple I'm trying to modify groups. The JSON string is passed to the bash script as an argument (it doesn't exist in a file). here is my json build format #!/bin/bash JSON_STRING=$(jq -n \\ --arg con Aug 24, 2023 · I often call curl in a bash script. Here is a script which demonstrates how to use jq's @sh formatting directive along with bash eval to set bash variables using the output of a filter. "native" and "schemas" also "groups. In this tutorial, we’ll learn how to make the jq program reusable by passing Bash variables to it. We will use jq, a powerful command-line utility specifically designed for working with JSON data in Bash. I needed it to pass a list of files to a linter inside of a github action. json I want to extract the value of customfield_11500 from this a. , then you will want to preprocess that with some tool that is able to isolate the elements correctly and assign them to an array Variables reference Visual Studio Code supports variable substitution in Debugging and Task configuration files, and for some select settings. See also this question about building a JSON object from Bash variables. JSON, short for JavaScript Object Notation, is an organized data structure commonly seen in modern APIs. See Understanding Bash's Read-a-File Command Substitution for more details. Oct 11, 2017 · my idea is to put json string into variable JSON, i have a command whom takes a console login to user in AWS IAM, the comand is : aws iam create-login-profile --cli-input-json file://create-login-p DockerHub: json2env GitHub: json2env Kilna's swiss army knife for turning JSON objects into eval-able environment shell code for setting environment variables. e. I am getting folder names from artifactory in JSON format and I wanted to get that in one variable through shell scri Sep 7, 2021 · All environment variables are strings -- every single one of them. Aug 24, 2022 · I am forming a JSON dynamically during the pipeline run based on few pipeline parameters and pre-defined environment variables and trying to pass this JSON as an input in subsequent pipeline task. . the variable values is empty, will this script throw an exception and therefore will I have to add an additional check for empty values? 88 The availability of parsers in nearly every programming language is one of the advantages of JSON as a data-interchange format. Master the use of jq for JSON processing in Linux Bash with our comprehensive guide. I did this on powershell, I just piped my output to a variable then piped it to ConvertTo-Json. com,qwe@xyz. a script, is because in order for the enviroment variables to persist in the active shell after the script terminates. sed and AWK provide regular expressions, but those are not a good solution to the problem of correctly parsing JSON. Dec 12, 2022 · I am running a command that is pulling json from kubectl and I need to take that json and input it into another json array. You cannot have an environment variable that is not a string. This concise guide reveals techniques for effective scripting mastery. Now that we have clarified the distinction between shell scripting and Bash let's proceed with parsing JSON in a Bash shell script. Yes as you can see my post, I 've already tried that. Get output from an Azure CLI command, such as a password. com,qq@xyz. Jun 2, 2020 · grep "X_serial" 123. variable. Jun 25, 2021 · Effectively use JSON data at the command line with jc, jq, and Bash. Dec 4, 2023 · Are you finding it challenging to parse JSON data in Bash? You’re not alone. "1". May 3, 2022 · I have this json file in my directory and I just want to read this json file and have credentials, I just want to store this key value in variable while running shell script code. ircb sana peqs qnfub bmtcqvy gvxe thrvbz veddt ksotut qab vmxmj faxb dql zgnqt bhtfflv