JSON Key Converter

Rename keys in JSON, YAML, .env, CSV headers or query strings — values are never changed.

Runs entirely in your browser.

Convert keys to

Input

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Input

JSON

10 lines · 246 charsdrop a file here

Output

camelCase

{
  "userId": 12345678901234567890,
  "firstName": "Ada",
  "lastName": "Lovelace",
  "__typename": "User",
  "contactInfo": {
    "emailAddress": "ada@example.com",
    "phoneNumbers": [{ "phoneType": "mobile", "isPrimary": true }]
  }
}

8 keys renamed · 1 unchanged

Key mapping8Show

Original		Converted
user_id	→	userId
first_name	→	firstName
last_name	→	lastName
contact_info	→	contactInfo
email_address	→	emailAddress
phone_numbers	→	phoneNumbers
phone_type	→	phoneType
is_primary	→	isPrimary