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JSON Data Censor

World's Simplest JSON Tool

Free online JSON censoring tool. Just load your JSON in the input field and all sensitive data in it will automatically get censored. In the tool options, you can customize which values should be censored. You can censor keys and values in objects, values in arrays, and numbers in numeric data types. Also, you can specify the string to replace sensitive data with in the output JSON. Created for developers by developers from team Browserling.

᠎᠎᠎          Tool Options

String Censoring

Censor text values in JSON.
Strings to censor (one per line).
Replace values with this string.
Match the case of strings.
Repeat the replacement string
to match the value length.
Replace only full words in strings.

Key Censoring

Censor object keys in JSON.
Keys to censor (one per line).
Replace keys with this string.
Match the case of keys.
Repeat the replacement string
to match the key length.
Replace only full words in keys.

Number Censoring

Censor numeric data types
in JSON.
Numbers to censor (one per
line). Enter individual numbers
or ranges (e.g., "-5 - 10").
Replace numbers with this
number or string.

JSON Output

Pretty-print the output JSON
and add space indents.
Number of spaces in one indent.
Pretty-print the output JSON
and add tab indents.
Output JSON in a minified
format without indentation.

What Is a JSON Data Censor?

This tool makes it easy to remove or hide all unwanted words, strings, patterns, keys, and numbers from the given JSON data structure. It allows you to quickly censor confidential information, personal data, phone numbers, and other sensitive records. In the tool options, you can manage which parts of the JSON data structure should be censored. In particular, to censor data in JSON strings, activate the "Censor JSON Strings" checkbox and specify all the patterns that should be concealed in the multi-line option. Then, enter a new pattern to use in place of the hidden value. For example, you can replace the individual's name "Sam" with the asterisk symbol "*" or another placeholder of your choice, such as "[REDACTED]". If you are replacing a longer word with a single symbol or a shorter pattern, you can enable the "Mask Each Symbol" option, which will make the replacement the same length as the original value. If this option is on, then in the same example, the word "Sam" will be replaced with three asterisk symbols "***" (one for each letter). If the string that you want to replace is used in both as an independent word and as part of another word (for example, "Sam" can be an independent word or used in the word "Sample"), then you can activate the "Match Full Words Only" option to censor only independent word. To censor keys in JSON objects, activate the "Censor JSON Keys" checkbox. Then, in a similar way, enter the keys you want to replace and specify their replacements. Optionally, you can also configure the case sensitivity of the patterns. To censor numeric values in JSON, activate the "Censor JSON Numbers" option. This option only replaces numeric data types that are not surrounded by quotes. For example, you can censor age, price, or geographic coordinates. The numbers you want to censor can be specified in a vertical list in the multi-line option one by one (for example, "10", "-25", or "32.65"). To quickly censor multiple numbers in JSON, you can specify a range of values. For example, the range "1-100" will censor all numbers from 1 to 100, and the range "-50--5" will censor all numbers from -50 to -5. A new number or a string can be set in place of the censored number. For example, you can replace all numbers with just zero "0" or a string "[NUMERIC]". Finally, you can choose the format for outputting JSON with censored data. In particular, you can choose whether to use a prettified JSON format with indentation, select spaces or tabs for indentation, or output a minified JSON without indentation. Json-abulous!


JSON Data Censor Examples

Click to try!

Censor Personal Information

In this example, we hide the personal information of a person in a JSON record. The unwanted data resides in the string values of a JSON object, so we activate the "Censor JSON Strings" option and configure the masking options. We replace the first name, the last name, and the last four digits of the phone number with asterisks (*). The number of asterisks corresponds to the length of the hidden value. Additionally, we disable the case sensitivity option to simultaneously replace the first name and last name written in both uppercase and lowercase letters.

{ "first_name": "Ava", "last_name": "Brown", "email": "ava.brown@company.com", "phone": "454-767-8899" }
{ "first_name": "***", "last_name": "*****", "email": "***.*****@company.com", "phone": "454-767-****" }
Required options
These options will be used automatically if you select this example.
Censor text values in JSON.
Strings to censor (one per line).
Replace values with this string.
Match the case of strings.
Repeat the replacement string
to match the value length.
Replace only full words in strings.
Censor object keys in JSON.
Censor numeric data types
in JSON.
Pretty-print the output JSON
and add space indents.
Number of spaces in one indent.

Hide Sensitive User Preferences

In this example, we protect a user's privacy by hiding sensitive data that contains their political views in both the JSON object's key and value. We do it by specifying the key "political_views" in the JSON-key censoring option and the value "liberal" in the JSON-value censoring option. We replace this data with the string "[OMITTED]", effectively masking the user's political views. Moreover, we preserve the input structure of the JSON by adding tab indentation to the output JSON.

{ "user_id": "user123", "preferences": { "language": "en", "theme": "dark", "political_views": "liberal" } }
{ "user_id": "user123", "preferences": { "language": "en", "theme": "dark", "[OMITTED]": "[OMITTED]" } }
Required options
These options will be used automatically if you select this example.
Censor text values in JSON.
Strings to censor (one per line).
Replace values with this string.
Match the case of strings.
Repeat the replacement string
to match the value length.
Censor object keys in JSON.
Keys to censor (one per line).
Replace keys with this string.
Match the case of keys.
Repeat the replacement string
to match the key length.
Censor numeric data types
in JSON.
Pretty-print the output JSON
and add tab indents.

Redact Sensitive Financial Details

In this example, we redact the balance and all transaction amounts from an exported financial document in JSON format. As the balance and transactions have numerical data types, to hide them, we activate the "Censor JSON Numbers" option. Then we specify the current balance in the options as "1201.50" and to hide all transactions, we specify a range of transaction amounts as "1-1000". As a result, all numerical data are replaced with the value "0", ensuring that financial information remains confidential.

{ "balance": 1200.50, "transactions": [ { "date": "2024-05-15", "amount": 50.35, "description": "Groceries" }, { "date": "2024-05-10", "amount": 42.80, "description": "Beauty and health" } ] }
{ "balance": 0, "transactions": [ { "date": "2024-05-15", "amount": 0, "description": "Groceries" }, { "date": "2024-05-10", "amount": 0, "description": "Beauty and health" } ] }
Required options
These options will be used automatically if you select this example.
Censor text values in JSON.
Censor object keys in JSON.
Censor numeric data types
in JSON.
Numbers to censor (one per
line). Enter individual numbers
or ranges (e.g., "-5 - 10").
Replace numbers with this
number or string.
Pretty-print the output JSON
and add space indents.
Number of spaces in one 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/censor-json?input=%7B%0A%20%20%22first_name%22%3A%20%22Ava%22%2C%0A%20%20%22last_name%22%3A%20%22Brown%22%2C%0A%20%20%22email%22%3A%20%22ava.brown%40company.com%22%2C%0A%20%20%22phone%22%3A%20%22454-767-8899%22%0A%7D&censor-strings=true&case-sensitive-strings=false&strings-from=Ava%250ABrown%250A8899&string-to=%252A&match-string-length=true&match-words-in-strings=false&censor-keys=false&censor-numbers=false&use-space-indent=true&number-of-spaces=2

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