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JSON Key Extractor

World's Simplest JSON Tool

Free online JSON key extractor. Just load your JSON object in the input field and the tool will automatically convert its keys to a list. In the tool options, you can specify the extraction depth of the nested objects, set an output separator for the extracted keys, and wrap the keys in quotes. Created for developers by developers from team Browserling.

᠎᠎᠎          Tool Options

Key Extraction Depth

Depth of the object(s) from which
you want to extract keys.
To extract all keys, enter "*".
To extract keys from
specific depths, use
depth values like "1, 2, 4"
or ranges like "2-5".
For example, the root object
has depth 1, and the object
nested within it has depth 2.

Key Separator Symbol

Separator symbol for the
extracted keys.
Use \n for a newline and \t
for a tab.

Stringify Keys

Wrap the extracted keys
in double quotes.

What Is a JSON Key Extractor?

This tool extracts object keys from the given JSON (JavaScript Object Notation). In the input, you must load a valid JSON object, and the program will recursively walk through it and extract keys from each depth level, including nested objects. To extract keys from specific depth levels, you can specify the recursion depth values in the options. For example, the depth of "2" means the program should extract keys only from an object nested within the root object or root array. If you want to extract keys only from the main (outer) object, you can specify the number "1" in the depth option. Similarly, to extract keys from the main object and another object that it contains, enter two numbers "1, 2" in the depth option. To extract even more keys from even deeper objects, you can use a range, such as "1-4". To quickly extract all keys from all levels, use the asterisk "*". You can also specify a delimiter character in the options to use for separating the extracted keys. Additionally, you can enclose the extracted keys in double quotes, which makes it easy to integrate them in other programs and programming languages. If you need to extract values from JSON objects, you can use our Extract JSON Values tool. Json-abulous!


JSON Key Extractor Examples

Click to try!

Extract JSON Object Keys

In this example, we extract keys from a JSON object containing geolocation data. We set the extraction depth to 1, which means: extract keys only from the outer (root) object without recursing into any child objects. Additionally, we change the delimiter symbol to a comma "," symbol. As a result, we obtain a comma-separated list of latitude, longitude, altitude, and timestamp, which are the four keys of the root object.

{ "latitude": 37.7749, "longitude": -122.4194, "altitude": 100, "timestamp": "2024-05-03T12:00:00Z" }
latitude, longitude, altitude, timestamp
Required options
These options will be used automatically if you select this example.
Depth of the object(s) from which
you want to extract keys.
Separator symbol for the
extracted keys.
Wrap the extracted keys
in double quotes.

Extract Keys from Nested JSON

In this example, we load a JSON object representing a shape with three levels of nesting. As we want to extract keys only from specific levels within this nested structure, we set the depth to "2, 3". This depth argument extracts keys from depth 2 (this is the "shape" object) and depth 3 (this is the "dimensions" object). As a result, we get 5 keys, which we separate with a space. Notice that the key "shape" wasn't extracted as it's located at depth 1 (root object).

{ "shape": { "square": true, "color": "red", "dimensions": { "width": 10, "height": 10 } } }
square color dimensions width height
Required options
These options will be used automatically if you select this example.
Depth of the object(s) from which
you want to extract keys.
Separator symbol for the
extracted keys.
Wrap the extracted keys
in double quotes.

Recursively Extract Keys from All JSON Levels

In this example, we enter the "*" symbol in the extraction depth option to recursively extract all keys from all levels of the given JSON object. The input JSON contains detailed information about a player, including name, level, and inventory. The depth of this JSON is 4, which means it has objects or arrays at levels 1, 2, 3, and 4. In the output, we get all 10 keys, and we separate them with a newline ("\n") character, and enclose them in double quotes so that it was easy to copy them to another program and use as strings.

{ "player": { "name": "Hero", "level": 10, "inventory": [ { "name": "Sword", "damage": 50 }, { "name": "Leather Armor", "defense": 20 }, { "name": "Health Potion", "healAmount": 50 } ] } }
"player" "name" "level" "inventory" "name" "damage" "name" "defense" "name" "healAmount"
Required options
These options will be used automatically if you select this example.
Depth of the object(s) from which
you want to extract keys.
Separator symbol for the
extracted keys.
Wrap the extracted keys
in double quotes.

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/extract-json-keys?input=%7B%0A%20%20%22latitude%22%3A%2037.7749%2C%0A%20%20%22longitude%22%3A%20-122.4194%2C%0A%20%20%22altitude%22%3A%20100%2C%0A%20%20%22timestamp%22%3A%20%222024-05-03T12%3A00%3A00Z%22%0A%7D&depth=1&separator=%252C%20&add-quotes=false

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