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JSON Array Flattener

World's Simplest JSON Tool

Free online JSON array flattener. Just load your nested JSON array in the input field and it will automatically get converted into a flat, single-level array. In the tool options, you can also change the depth of flattening and control how many levels of nested arrays should be removed. Additionally, you can customize the format of the flattened array by changing its output format. It can be minified or indented with spaces or tabs. Created for developers by developers from team Browserling.

JSON Array Flattener

World's Simplest JSON Tool

Free online JSON array flattener. Just load your nested JSON array in the input field and it will automatically get converted into a flat, single-level array. In the tool options, you can also change the depth of flattening and control how many levels of nested arrays should be removed. Additionally, you can customize the format of the flattened array by changing its output format. It can be minified or indented with spaces or tabs. Created for developers by developers from team Browserling.

Tool Options

Flattening Depth

How many levels of nested arrays to convert into a flat list?
Enter an asterisk (*) to flatten all nested arrays.

Output Array Format

Use spaces to indent the output JSON structure.
Number of spaces per indent.
Use tabs to indent the output JSON structure.
Create a compact JSON without extra whitespace.

What Is a JSON Array Flattener?

This tool converts multiple nested JSON arrays into a flat list. This process is called flattening and it's a data structure transformation that converts a multi-level data structure (such as an array of arrays) into a single-level one (such as just an array or a list). It can be used to simplify the analysis and processing of data as after flattening, the data becomes single-dimensional. The tool only works with arrays, so make sure that your input data is a valid JSON array and not some other data type. This program also offers several options to adjust the conversion process. In particular, the "Flatten Depth" option determines how many levels of nested arrays should be traversed and converted into a flat list. For example, if you have a three-dimensional array ["a", ["b", ["c"]]] and you enter a depth of 1, then your array's dimension will be reduced by one and it will turn into a two-dimensional array ["a", "b", ["c"]]. Similarly, if you enter a depth of 2, then it will turn into a one-dimensional, flat array ["a", "b", "c"]. You can think about the depth option as to how many dimensions to remove from the original array. To cover all cases and convert deeply nested arrays into a flat one, enter the asterisk "*" symbol in the depth option. This option will make the tool travel the full depth of the array recursively and output a flat list. Another set of options allows you to customize the format of the output array. You can add indentation to the JSON array via spaces or tabs, and also specify the number of spaces used for each level of indentation. Or, you can create a compact, minified JSON array without indentation or extra spaces between array elements. If you're working with JSON objects and not arrays, and you need to flatten them and create JSON properties-like data structure, you can use our Flatten a JSON Object tool. Json-abulous!

What Is a JSON Array Flattener?

This tool converts multiple nested JSON arrays into a flat list. This process is called flattening and it's a data structure transformation that converts a multi-level data structure (such as an array of arrays) into a single-level one (such as just an array or a list). It can be used to simplify the analysis and processing of data as after flattening, the data becomes single-dimensional. The tool only works with arrays, so make sure that your input data is a valid JSON array and not some other data type. This program also offers several options to adjust the conversion process. In particular, the "Flatten Depth" option determines how many levels of nested arrays should be traversed and converted into a flat list. For example, if you have a three-dimensional array ["a", ["b", ["c"]]] and you enter a depth of 1, then your array's dimension will be reduced by one and it will turn into a two-dimensional array ["a", "b", ["c"]]. Similarly, if you enter a depth of 2, then it will turn into a one-dimensional, flat array ["a", "b", "c"]. You can think about the depth option as to how many dimensions to remove from the original array. To cover all cases and convert deeply nested arrays into a flat one, enter the asterisk "*" symbol in the depth option. This option will make the tool travel the full depth of the array recursively and output a flat list. Another set of options allows you to customize the format of the output array. You can add indentation to the JSON array via spaces or tabs, and also specify the number of spaces used for each level of indentation. Or, you can create a compact, minified JSON array without indentation or extra spaces between array elements. If you're working with JSON objects and not arrays, and you need to flatten them and create JSON properties-like data structure, you can use our Flatten a JSON Object tool. Json-abulous!


JSON Array Flattener Examples

Click to try!
click me

Convert a 2D JSON Array to a 1D JSON Array

In this example, we load a JSON array containing three subarrays, each filled with animal names. As the main (outer) array contains subarrays, the dimension of this data structure is two, so it's a two-dimensional array. The tool flattens this structure and displays all animals ("cat", "dog", "bird", "fish", "mouse", "raccoon") in a single, one-dimensional array, making it easier to iterate and process the data. We also change the format of the output JSON array by adding tabs for indentation.

[ [ "cat", "dog" ], [ "bird", "fish" ], [ "mouse", "raccoon" ] ]
[ "cat", "dog", "bird", "fish", "mouse", "raccoon" ]
Required options
These options will be used automatically if you select this example.
How many levels of nested arrays to convert into a flat list?
Use tabs to indent the output JSON structure.
click me

Flatten Multiple Nested JSON Arrays

In this example, we flatten a JSON array representing a pizza recipe. The array includes a list of ingredients nested in arrays at different levels. By setting the recursion depth option to 2, we flatten the first and second nested JSON arrays. As a result, the original four-dimensional array gets converted to a two-dimensional array.

[ "Pizza", [ [ "Flour", "Yeast", "Water" ], [ "Tomato Sauce", "Cheese", ["Pepperoni", "Mushrooms"] ] ] ]
[ "Pizza", "Flour", "Yeast", "Water", "Tomato Sauce", "Cheese", [ "Pepperoni", "Mushrooms" ] ]
Required options
These options will be used automatically if you select this example.
How many levels of nested arrays to convert into a flat list?
Use spaces to indent the output JSON structure.
Number of spaces per indent.
click me

Fully Flatten a JSON Array

In this example, we fully flatten a deeply nested numerical array. The input JSON contains a list of the first eight prime numbers, where each subsequent number forms a new nested array, thus creating a right-leaning 8-dimensional array. To quickly convert this array into a one-dimensional array, we enter the asterisk symbol "*" in the depth option. The asterisk matches the maximum array depth and makes the program output a flat list. Additionally, the output list is minified to save space.

[2, [3, [5, [7, [11, [13, [17, [19]]]]]]]]
[2,3,5,7,11,13,17,19]
Required options
These options will be used automatically if you select this example.
How many levels of nested arrays to convert into a flat list?
Create a compact JSON without extra whitespace.

Pro tips Master online json tools

You can pass input to this tool via ?input query argument and it will automatically compute output. Here's how to type it in your browser's address bar. Click to try!

https://onlinetools.com/json/flatten-json-array?input=%5B%0A%20%20%5B%0A%20%20%20%20%22cat%22%2C%0A%20%20%20%20%22dog%22%0A%20%20%5D%2C%0A%20%20%5B%0A%20%20%20%20%22bird%22%2C%0A%20%20%20%20%22fish%22%0A%20%20%5D%2C%0A%20%20%5B%0A%20%20%20%20%22mouse%22%2C%0A%20%20%20%20%22raccoon%22%0A%20%20%5D%0A%5D&depth=1&use-tab-indent=true

All JSON Tools

Didn't find the tool you were looking for? Let us know what tool we are missing and we'll build it!
Quickly color-code the syntax of a JSON file.
Quickly beautify a JSON data structure.
Quickly compress a JSON file.
Quickly convert JavaScript data to a JSON string.
Quickly convert a JSON string to JavaScript data.
Quickly check JSON for errors and report them.
Quickly escape special JSON characters.
Quickly unescape an escaped JSON string.
Quickly convert a JSON data structure to an XML file.
Quickly convert an XML file to a JSON data structure.
Quickly convert a JSON data structure to a YAML markup.
Quickly convert a YAML markup to a JSON data structure.
Quickly convert a JSON file to a TSV file.
Quickly convert TSV data to a JSON file.
Quickly convert a JSON file to a CSV file.
Quickly convert CSV data to JSON data.
Quickly convert a JSON structure to binary JSON encoding.
Quickly convert JSON to a PNG, GIF, JPG, or BMP image.
Quickly create a screenshot from JSON code.
Quickly encode JSON to base64.
Quickly decode base64 to JSON.
Quickly convert JSON to URL-encoding.
Quickly convert URL-escaped JSON back to JSON.
Quickly convert JSON data to plain text.
Quickly edit a JSON file in a neat JSON editor in your web browser.
Quickly extract keys from objects in JSON data.
Quickly extract values from objects in JSON data.
Quickly reduce the nesting level of an array of arrays.
Quickly create a single-level JSON object from nested JSON objects.
Quickly rewrite JSON strings, keys, and values using escape codes.
Quickly obfuscate a JSON data structure.
Quickly remove certain information from a JSON data structure.
Quickly display detailed information about a JSON data structure.
Quickly convert a JSON file to properties file.
Quickly convert a properties file to a JSON file.

Coming Soon

These JSON tools are on the way!
Find JSON Keys/Values

Find keys and/or values that interest you in a JSON file.

Convert JSON to a List

Create a text list from a JSON array or object.

Convert a List to JSON

Create a JSON array from a text list.

Convert JSON to Form Data

Generate HTTP form data from a JSON object.

Convert Form Data to JSON

Generate JSON object from HTTP form data.

Convert JSON to HTML

Create a HTML table from keys and values of a JSON object.

Convert JSON to CSON

Convert a JSON file to a CSON file.

Convert CSON to JSON

Convert a CSON file to a JSON file.

Convert JSON to TOML

Convert a JSON config to a TOML config.

Convert TOML to JSON

Convert a TOML file to a JSON file.

Convert JSON to Bencode

Convert a JSON data structure to Bencode encoding.

Convert Bencode to JSON

Convert Bencode data to JSON data.

Convert JSON to JSONL

Convert a JSON file to a JSONL file.

Convert JSONL to JSON

Convert a JSONL file to a JSON file.

Convert BSON to JSON

Convert binary JSON data structure (BSON) to JSON.

Convert JSON to UBJSON

Convert a JSON file to a universal binary JSON (UBJSON).

Convert UBJSON to JSON

Convert universal binary JSON (UBJSON) to regular JSON.

Convert JSON to Message Pack

Serialize JSON data to binary MessagePack format.

Convert Message Pack to JSON

Unserialize binary MessagePack to a JSON struct.

Convert JSON to Protobuf

Serialize JSON data to binary Protobuf format.

Convert Protobuf to JSON

Unserialize binary Protobuf to a JSON struct.

Convert JSON to a LaTeX Table

Generate a LaTeX table from a JSON object.

Convert JSON to INI

Convert a JSON data file to an INI configuration file.

Convert INI to JSON

Convert an INI configuration file to JSON data file.

Truncate JSON

Loop over JSON structure and truncate all values or keys.

Find JSON Depth

Find the nesting depth of a JSON data structure.

Convert JSON to a Data URI

Convert a JSON data structure to a data URL.

Convert JSON to a PHP Array

Create a PHP data structure from a JSON data structure.

Convert a PHP array to JSON

Create a JSON data structure from a PHP data structure.

Compare Two JSON Files

Diff JSON files and show differences visually.

Sort JSON Object Keys

Lexicographically sort the order of JSON object keys.

Swap JSON Keys with Values

Exchange keys with values in a JSON file.

Create a Random JSON Array

Create a JSON array with random values.

Create a Random JSON Object

Create a JSON object with random keys and values.

Randomize a JSON Array

Randomly change the positions of array elements.

Randomize a JSON Object

Randomly change the order of key, value pairs.

Add Spacing to JSON

Add random spaces and newlines in a JSON file.

Tokenize JSON

Tokenize a JSON data structure.

Remove JSON Syntax

Remove all JSON syntax and leave just the values.

Change JSON Syntax

Change curly braces, commas, and quotes to other symbols.

Fix Quotes in JSON

Fix incorrectly quoted (usually single quote) keys and values.

Use Single Quotes in JSON

Make all keys and values in a JSON to be single-quoted.

Use Double Quotes in JSON

Make all keys and values in a JSON to be double-quoted.

Generate FakeSON

Create JSON that looks real but is fake (FakeSON).

Run jq

Execute a jq query on a JSON data structure.

Filter JSON

Filter keys and values that match a pattern.

Split a String into a JSON Array

Create a JSON array from a string.

Group a JSON Array

Create groups of JSON array items.

Merge JSON Arrays

Merge two or more JSON arrays together.

Compare JSON Arrays

Find differences in two or more JSON arrays.

Merge JSON Objects

Merge two or more JSON objects together.

Damage JSON

Introduce errors in a JSON data structure.

Fix JSON

Try to fix a damaged JSON to the best of our ability.

Create JSON Art

Convert images to valid JSON strings that look like ASCII art.

Visualize a JSON Structure

Create an abstract visualization of JSON's complexity.


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Created with love by

We're Browserling — a friendly and fun cross-browser testing company powered by alien technology. At Browserling, our mission is to make people's lives easier, so we created this collection of JSON tools. Our tools have the simplest user interface that doesn't require advanced computer skills and they are used by millions of people every month. Behind the scenes, all JSON tools are actually powered by our web developer tools that we created over the last couple of years. Check them out!

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