Jq merge arrays. Dec 8, 2016 · This is helpful.

Jq merge arrays name value. merge() operation forms an array that contains all elements from the two arrays. They each contain an array of JSON objects. Mar 19, 2020 · I want to be able to combine just the fruit values into a string without the other keys and occupy one cell in a spreadsheet. Thank you! Asking because - though no jq expert - trying to envision a solution in more expressive languages (say python/Perl) gives me more than a couple LOCs, and at least a recursion (or a morally equivalent loopy procedure). merge() function is destructive. 6, 1. Note that this is severely memory-inefficient and slow if the input is huge. [0]. a)) | add' f?. records | map(. json. json [ { You'll need to complete a few actions and gain 15 reputation points before being able to upvote. Starting with, I have rows such as:. registration. json has been fixed to make it valid JSON (btw, this can be done by jq itself). Oct 28, 2025 · jq Cheet Sheet. For example: #!/bin/bash -e Sep 21, 2020 · How to merge arrays from multiple json files with JQ? Ask Question Asked 5 years, 2 months ago Modified 3 years, 6 months ago Dec 27, 2015 · 150 If your input is a stream of objects, then unless your jq has inputs, the objects must be "slurped", e. attributes | add] | . The trick is to pipe that array through the add function which will combine each of those individual objects into a single object. 4, 1. attributes = [. Something like field 1 of two objects have the same value. with the help of this answer I have successfully added all objects into a single object as an array. file1. json [ { May 21, 2020 · I am trying to merging hundreds of thousand JSON files that have a single object. Does each of the input files contain an array with exactly one Aug 3, 2020 · The first input call loads the array from your primary file and add converts this array to an object. The $. jq/ or the directory ~/. somecommand | jq -r '[ . Then map_values merges each sub-object with a new object loaded from the input stream (now on the secondary file) by subsequent input calls. name keys, so we delete the latter in each object. Supports nested JSON and large datasets. 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. Jul 24, 2014 · Hi, It there a way to merge two json files with arrays so that the array is merged instead of overwritten? Ie: File1: Oct 8, 2023 · Tip 9: Combining Multiple JSON Files When you have multiple JSON files and need to combine them into a single JSON array or object, jq can be quite handy: To combine multiple JSON objects into an May 21, 2020 · Merging multiple json file into one object using JQ with argument Ask Question Asked 5 years, 5 months ago Modified 4 years, 10 months ago This is for anything regarding the command line, in any operating system. Apr 8, 2023 · The JOIN() function gives us arrays (pairs in the example) of matching objects that we merge using the add function. GitHub Gist: instantly share code, notes, and snippets. Step-by-step guide for developers and data engineers. Jun 6, 2025 · A comprehensive jq cheat sheet for using jq with files and pipes, including syntax, arguments, selectors, and key functions like keys, length, flatten, and unique. g. 8 Manual For other versions, see 1. Jun 9, 2022 · I'm using jq to try and merge 2 json files into one unique file. That query has you 90% of the way there. I've got 2 json files and want to merge them into one unique file Here the content of files: file1 { "value1" When what you really wanted was a single object full of those unique key-value pairs. by pre-processing the addition, and storing it in the last affected array. Jan 18, 2022 · Let's assume that you are interested in a jq solution, that the array of objects is in a file objects. All questions (including dumb ones), tips, and links to interesting programs/console applications you've found or made yourself are welcome. Feb 28, 2023 · Using jq, how can I merge two (or more) objects with the same keys whose value is an array while concatenating the array? Asked 2 years, 8 months ago Modified 2 years, 8 months ago Viewed 7k times Oct 20, 2018 · If I understand your question correctly, you just want to output an array which contains the object in each file. json : [ {"a In contrast to RomanPerekhrest's solution, this will allow you merge the target field without remaking the entire object: jq -s '. [0]' file*. Mar 23, 2021 · json jq array-merge Follow this question to receive notifications edited Mar 31, 2021 at 5:18 peak Jun 20, 2024 · The problem is, that you want to merge like * would, but treat colliding arrays like + would. While being excited seeing how nice it can work I just got stuck at arrays, given below files and command - output May 29, 2024 · We group the incoming data from the other file on the namespace key, which gives us an array with each element being an array of objects with the same namespace value. Aug 9, 2021 · jq merge values of same key into an array? Ask Question Asked 4 years, 2 months ago Modified 1 year, 11 months ago May 29, 2020 · jq how to merge array objects into single object Asked 5 years, 4 months ago Modified 4 years, 2 months ago Viewed 2k times Jun 20, 2024 · There are multiple questions on this topic already, and they all look closely related: jq merge values of same key into an array? requires knowledge of the keys in each object, as far as I can tel Learn to combine multiple JSON files using JQ in Shell Scripting. json This returns the entirety of the first json file with the . It alters the length and numeric index properties of the first object to include items from the second. jq in the pwd registration. May 27, 2025 · Learn how to effectively deep merge two JSON files containing arrays using jq. Linux / BSD / OSX / Windows CLI and TUI apps or questions or comments, we're happy to take them all! This workflow template demonstrates how to efficiently merge two JSON datasets using JQ, focusing on the key "Email_Address" to match entries. Nov 13, 2023 · I have a JSON file with the following code: { "fruits": [ { "name": "banana" }, { "name": "apple" } ], "vege May 24, 2016 · Working with data from an art museum API and from the Twitter API, this lesson teaches how to use the command-line utility jq to filter and parse complex JSON files into flat CSV files. [] is flatten[]. Jan 17, 2013 · jq's + and add functions (+ takes two arguments, add takes an array and adds them all up) can merge objects. Concatenating fields in JQ with examplesHow to concatenate 2 fields in JSON using JQ Suppose you have the following JSON input: Sep 27, 2016 · 20 If what you want is CSV-formatted output from your JSON document, then you may use the @csv operator in jq. Improve your data processing skills with this step-by-step tutorial. 1. json We apply your current transformation to each elements of the slurped array of inputs (your previous individual inputs), then we merge those transformed arrays into one with add. But how does it select only the objects with "alice" to go with the "alice" key? That is eluding me. We began with a basic understanding of JSON data and structure, then demonstrated the syntax of the jq command for merging multiple files. Learn how to efficiently merge multiple arrays using jq in this step-by-step guide. The orders of items in the arrays are preserved, with items from the second array appended. The information below cover merging items with different array labels. ---This vid May 17, 2024 · In this article, we discussed how to merge JSON files in Linux using the jq command. May 5, 2022 · How to merge arrays from multiple arrays in two JSON with JQ Ask Question Asked 3 years, 6 months ago Modified 3 years, 6 months ago Oct 29, 2023 · In the following blog post learn how to use jq to transform multiple JSON data files into a single file. host_name ] | @csv' This uses the same expression that you're using in the question to pull out the data that you want, but it puts all the host names into an array. But when I tried to use the a wild card like jq -s Jun 12, 2021 · and you'll get a similar but separate array from your second object. Jul 18, 2017 · How to combine an array into a single string value when using CSV output in jq? Asked 8 years, 3 months ago Modified 8 years, 3 months ago Viewed 48k times Nov 10, 2025 · I would like to merge two files containing JSON. Edit I am still Dec 7, 2018 · Using $ variables in the arguments of definitions is not supported in all extant versions of jq. In this case, -s will already do that for you, so you just need jq -s . host_components[]. You could prepare those arrays such that merging with * will eventually work as desired, e. jq --slurp 'map(. 8, 1. Oct 10, 2010 · Would you mind explaining how the reduce part works? I see what happens: it makes an object whose keys are "alice" and "bob" and the values of those keys are arrays filled with objects that have the corresponding . A jq program is a "filter": it takes an input, and produces an output. []. jq/joins/ there is no file named joins. Thus one way to combine objects in the input stream is to use: I'm using the jq tools (jq-json-processor) in shell script to parse json. json file2. This guide will walk you through the ins and outs of working with arrays in jq, from basic operations to advanced techniques. May 3, 2017 · Your question has the potential to be quite interesting but because the data has a recursive structure, it would be helpful if you could elucidate the nature of the merge that you are expecting. using the -s command-line option, in order to combine them. 5, 1. Filters can be combined in various ways - you can pipe the output of one filter Nov 17, 2022 · Hey i am looking for a way to utilize jq as a replacement for helm and kustomize. 7, 1. What's reputation and how do I get it? Instead, you can save this post to reference later. Also, it would be helpful if you could clarify what you mean by "root element" in relation to the files and the array (s) they contain. I know that if there are only 2 files, I can use jq -s . The invocation to use would then be: Jan 12, 2022 · How to merge two simple JSON arrays together with JQ Asked 3 years, 9 months ago Modified 3 years, 9 months ago Viewed 3k times Jun 12, 2018 · I am struggling to merge two JSON arrays with jq, because I would like to remove duplicate keys in merged objects: Edit: added a second key since the example was too simple. This guide covers 7 practical jq commands for working with APIs, logs, and large JSON files like a pro. Learn how to use the jq merge command with examples. Master Arrays in jq by solving 5 exercises, with support from our world-class team. How to merge 2 files json in one with 1 array only for all ? thx #805 Closed mistertest opened this issue Jun 7, 2015 · 6 comments Jul 24, 2025 · Learn how to easily read, filter, and transform JSON data in your terminal using jq. Merge two JSON files using jq in a single line of code. Apr 10, 2025 · Learn how to merge multiple JSON files into one using our free online tool, Python scripts, JavaScript, and command-line jq. Nov 25, 2022 · Note that we need the two separate invocations of jq here as the first jq invocation would terminate prematurely if it tried to convert the input into JSON with fromjson into an array (or any other structure other than individual objects). attributes from all the others concatenated together. After joining and merging, we are left with objects containing both the name and the cmdb. jq: concatenate arrays from two different files. Ideal for businesses needing to consolidate user and device information, it simplifies data integration by combining user details with associated computer records. 5 or later, and that: joins. Defining the $-variables right up front is mainly done in the interests of efficiency and clarity. Jun 18, 2022 · This reads the original data with -s (--slurp) into an array, and reduce is used to iterate over that array. json, and that you are willing to invoke jq along the following lines: Conclusion Merging two arrays into a well-structured array of objects in JSON using jq may seem daunting for beginners, but breaking it down into clear steps can simplify the task immensely. It's this array of single key-value pair objects. Sep 15, 2020 · jq how to merge multiple arrays? Asked 5 years, 2 months ago Modified 1 year ago Viewed 12k times Nov 15, 2023 · Think of jq as a Swiss Army knife for JSON data, capable of slicing and dicing arrays with ease. Oct 27, 2022 · I'm working on a large JSON dataset (1GB+) and need to merge similar array objects, then merge their nested similar objects. Combine An Array Of Objects Into A Single Object If you've spent any amount of time pulling data out of a JSON file with jq, you may have run into a result set that looks a little too spacious. This guide provides a simple solution and detailed explanation to ensure you a Sep 28, 2022 · I have two arrays with the same amount of elements but with different keys/values. Upvoting indicates when questions and answers are useful. Dec 8, 2016 · This is helpful. jq as shown below is in the directory ~/. This is the most efficient way to combine two JSON files. [], but a shortcut way of writing flatten | . May 15, 2018 · I'm looking for JQ query that allows me to merge 2 arrays variables (not files) and also take me to overwrite first array with newer value from second array. I want to integrate the key/value of the second array into the first for each index/position. We'll provide clear examples and solutions to common problems. To merge these two arrays into one, we may simply pass the data through . 3 or development version. So, you first need to convert it into a list of objects with one key-value entry each, then add them together. Now I want to filter out some objects during merge if a specific field or parameter is duplicate. file1 file2 If you need additional transformations, please edit the question and give a short summary what you need (I didn't compare the expected result line-by-line with the actual output). HostRoles. The files can also have a variable number of fruits in the array. Jul 23, 2020 · I am trying to merge all json files in a directory (can be many). Jul 24, 2018 · Continue to help good content that is interesting, well-researched, and useful, rise to the top! To gain full voting privileges, jq 1. It provides a versatile and handy tool for various tasks, from simple array manipulations to complex data transformations. Is there a way I can run transpose and map so that I end up with a single object instead of an array of objects? or perhaps another transformation that can merge this resulting array into a single object? Mar 1, 2018 · 0 The following assumes you have jq 1. bqiyi meyde vifdu kpzhdv ylar emahb pnm obpb mrgmqf rvhzuy pssmh pvlbdl rcjfurmo rfm sefzj