TypeScript example
Convert snake_case to camelCase in TypeScript
A typed TypeScript helper can split underscore-delimited tokens, normalize their casing, and return a predictable camelCase string.
TypeScript code
function snakeToCamel(value: string): string {
const parts = value.trim().replace(/^_+|_+$/g, "").split(/_+/).filter(Boolean)
if (parts.length === 0) return ""
return parts[0].toLowerCase() + parts.slice(1).map((part) => part.charAt(0).toUpperCase() + part.slice(1).toLowerCase()).join("")
}
snakeToCamel("user_profile_image")
// "userProfileImage"The helper accepts and returns string values, making it easy to reuse in typed utilities, adapters, and mapping code.
Runtime conversion and type-level object-key remapping are separate concerns; converting a network payload still requires runtime logic.
Edge cases to consider
- Acronyms may require apiResponseURL instead of apiResponseUrl.
- Recursive object conversion also requires deciding how deeply TypeScript types reflect the runtime result.
- Mixed separators need broader tokenization.
- Different source keys can normalize to one key and must not be silently overwritten.
Example
| Before | After |
|---|---|
| user_profile_image | userProfileImage |
| __user__profile__ | userProfile |
| api_response_url | apiResponseUrl |
| created_at | createdAt |
TypeScript code
const cases: Array<[string, string]> = [
["user_profile_image", "userProfileImage"],
["__user__profile__", "userProfile"],
["api_response_url", "apiResponseUrl"],
["created_at", "createdAt"],
]
for (const [input, expected] of cases) {
if (snakeToCamel(input) !== expected) throw new Error(input)
}Try the conversion online
Use the browser-based converter for quick checks, batch values, acronym handling, or inputs that mix several naming conventions.
Detected: snake_case
camelCase output
userProfileImageUrl
All naming formats
camelCase
userProfileImageUrlPascalCase
UserProfileImageUrlsnake_case
user_profile_image_urlkebab-case
user-profile-image-urlCONSTANT_CASE
USER_PROFILE_IMAGE_URLdot.case
user.profile.image.urlpath/case
user/profile/image/urlConversion happens locally in your browser. Your input is not sent to a conversion server.