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JSON Object Flattener

World's Simplest JSON Tool

Free online JSON object flattener. Just load your JSON object containing more nested objects in the input field and it will automatically get converted into a flat properties-like object. In the tool options, you can customize the flattening depth (how many levels of nesting to flatten) and the symbol used to join keys from different levels of flattened objects. Also, you can prettify or minify the output JSON. Created for developers by developers from team Browserling.

JSON Object Flattener

World's Simplest JSON Tool

Free online JSON object flattener. Just load your JSON object containing more nested objects in the input field and it will automatically get converted into a flat properties-like object. In the tool options, you can customize the flattening depth (how many levels of nesting to flatten) and the symbol used to join keys from different levels of flattened objects. Also, you can prettify or minify the output JSON. Created for developers by developers from team Browserling.

Tool Options

Object Flattening Depth

How many levels deep should objects be flattened?
To flatten objects at all levels, enter the asterisk symbol "*".

Key Join Symbol

Symbol used to join keys of outer and inner objects.

JSON Indentation

Indent JSON with spaces.
Number of spaces per indent.
Indent JSON with tabs.
Minify the output JSON. (Drop extra spaces and newlines.)

What Is a JSON Object Flattener?

This tool converts nested JSON objects into a single-level JSON object. This operation is called object flattening, and in essence, it reduces the depth and dimension of a JSON object. When a JSON object is flattened, its inner objects get joined with objects from the previous nesting levels. The resulting JSON object is similar to a properties file, where configuration options are joined via a dot. The program accepts a JSON object containing more nested objects as input, recursively traverses this data structure, extracts nested properties and values from it, and combines them together. After flattening, the hierarchical structure of the original object is eliminated, making it easier to read and simpler to edit. When flattening nested objects, keys from different depth levels are combined together via the specified join symbol. This symbol is a dot "." by default but it can be changed in the options. The "Flatten Depth" option allows you to control the amount of flattening. You can change it to a value greater than or equal to 1 in this option to specify how deep the nested objects should be flattened. Entering an asterisk "*" flattens objects at all levels, creating a single-level output object with all keys merged via the join symbol. The tool also provides options for controlling the indentation and compactness of the output JSON. You can choose between space indentation, tab indentation, or no indentation at all, which will minify the flattened JSON. If you're using space indentation, then you can also specify the number of spaces for each indentation level (by default, it's 2 spaces). If you're working with arrays and not objects, then you can use our Flatten a JSON Array tool to convert multi-level arrays into single-level arrays. Json-abulous!

What Is a JSON Object Flattener?

This tool converts nested JSON objects into a single-level JSON object. This operation is called object flattening, and in essence, it reduces the depth and dimension of a JSON object. When a JSON object is flattened, its inner objects get joined with objects from the previous nesting levels. The resulting JSON object is similar to a properties file, where configuration options are joined via a dot. The program accepts a JSON object containing more nested objects as input, recursively traverses this data structure, extracts nested properties and values from it, and combines them together. After flattening, the hierarchical structure of the original object is eliminated, making it easier to read and simpler to edit. When flattening nested objects, keys from different depth levels are combined together via the specified join symbol. This symbol is a dot "." by default but it can be changed in the options. The "Flatten Depth" option allows you to control the amount of flattening. You can change it to a value greater than or equal to 1 in this option to specify how deep the nested objects should be flattened. Entering an asterisk "*" flattens objects at all levels, creating a single-level output object with all keys merged via the join symbol. The tool also provides options for controlling the indentation and compactness of the output JSON. You can choose between space indentation, tab indentation, or no indentation at all, which will minify the flattened JSON. If you're using space indentation, then you can also specify the number of spaces for each indentation level (by default, it's 2 spaces). If you're working with arrays and not objects, then you can use our Flatten a JSON Array tool to convert multi-level arrays into single-level arrays. Json-abulous!


JSON Object Flattener Examples

Click to try!
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Flatten a JSON Object with Nested Planetary Data

In this example, we're working with a JSON object containing information about Mars and Jupiter. The information includes their properties, such as moons and temperature. The tool flattens this data structure to a single level, creating a properties-like object. It uses a period (".") as the key joining symbol and adds two spaces of indentation for better readability.

{ "Mars": { "moons": 2, "temp": "209 K" }, "Jupiter": { "moons": 95, "temp": "88 K" } }
{ "Mars.moons": 2, "Mars.temp": "209 K", "Jupiter.moons": 95, "Jupiter.temp": "88 K" }
Required options
These options will be used automatically if you select this example.
How many levels deep should objects be flattened?
Symbol used to join keys of outer and inner objects.
Indent JSON with spaces.
Number of spaces per indent.
click me

Flatten Hotel Room Information

In this example, we flatten a JSON object from a hotel database. It contains data about a particular hotel, its location, and various room types (single and double). The tool flattens the data by one level (depth level is set to "1" in the options) and uses an underscore ("_") to join keys. As a result, the original three-dimensional JSON object is converted into a two-dimensional JSON object, and it's prettified in the output via tab indentation.

{ "name": "Grand Hotel", "location": "Paris", "rooms": { "single": { "price": 150, "availability": 20 }, "double": { "price": 250, "availability": 15 } } }
{ "name": "Grand Hotel", "location": "Paris", "rooms_single": { "price": 150, "availability": 20 }, "rooms_double": { "price": 250, "availability": 15 } }
Required options
These options will be used automatically if you select this example.
How many levels deep should objects be flattened?
Symbol used to join keys of outer and inner objects.
Indent JSON with tabs.
click me

Flatten a Multi-Level Compass Object

In this example, we load a multi-level JSON object from a game. It represents a compass with directions (north, east, south, west) and their degrees. We use full depth flattening by entering an asterisk ("*") in the maximum recursion option to traverse all nested objects. The keys of all objects are joined via a hyphen ("-").

{ "compass": { "point": { "N": { "degrees": "0°" }, "E": { "degrees": "90°" }, "S": { "degrees": "180°" }, "W": { "degrees": "270°" } } } }
{ "compass-point-N-degrees": "0°", "compass-point-E-degrees": "90°", "compass-point-S-degrees": "180°", "compass-point-W-degrees": "270°" }
Required options
These options will be used automatically if you select this example.
How many levels deep should objects be flattened?
Symbol used to join keys of outer and inner objects.
Indent JSON with spaces.
Number of spaces per indent.

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-object?input=%7B%0A%20%20%22Mars%22%3A%20%7B%0A%20%20%20%20%22moons%22%3A%202%2C%0A%20%20%20%20%22temp%22%3A%20%22209%20K%22%0A%20%20%7D%2C%0A%20%20%22Jupiter%22%3A%20%7B%0A%20%20%20%20%22moons%22%3A%2095%2C%0A%20%20%20%20%22temp%22%3A%20%2288%20K%22%0A%20%20%7D%0A%7D&depth=%252A&key-join-symbol=.&use-space-indent=true&number-of-spaces=2

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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