What's the file size limit?

The API endpoint accepts up to 1 MB of JSON per request. For larger files, run the formatter locally: node -e "console.log(JSON.stringify(JSON.parse(require('fs').readFileSync('input.json','utf8')),null,2))"

Yes — enable the 'Sort keys' option to sort object keys alphabetically at every level of nesting. Array element order is always preserved because arrays are ordered by definition.

How does the tool split compound words like 'innerHTML' or 'XMLParser'?

camelCase splitting uses two regex passes: first it inserts a space before any lowercase-to-uppercase transition (innerHTML → inner Html), then before any sequence of uppercase letters followed by an uppercase-then-lowercase transition (XMLParser → XML Parser). Both passes together correctly split 'XMLParser' into ['xml', 'parser'] and 'innerHTML' into ['inner', 'html'].

Does the tool preserve acronyms like 'URL' or 'HTTP'?

Acronyms are lowercased as part of tokenisation and then recased according to the target convention. In camelCase, 'parseURL' becomes 'parseUrl'; in PascalCase it becomes 'ParseUrl'. If your codebase uses a style guide that keeps acronyms uppercase (e.g. 'parseURL'), apply the conversion and then manually restore the acronym casing.

Tool comparison

JSON Formatter vs Text Case Converter

JSON Formatter (formatting) and Text Case Converter (text) come from different categories but appear together in developer workflows. This guide explains what each does and when to reach for one over the other.

Bottom line

JSON Formatter restructures structured JSON data; Text Case Converter transforms plain-text strings between camelCase, snake_case, UPPER_CASE, and other conventions. Use JSON Formatter when your input is valid JSON; use Text Case Converter for renaming variables, slugs, or labels.

What each tool does

JSON Formatter

JSON (JavaScript Object Notation) is a lightweight text format for representing structured data using key-value pairs, arrays, strings, numbers, booleans, and null. It is the dominant data interchange format for REST APIs, configuration files, and data storage. A JSON formatter parses a JSON string and re-serializes it with consistent indentation and line breaks (pretty-print) to make it human-readable, or removes all whitespace (minify) to produce the smallest possible representation for transmission or storage. This tool goes further: it validates syntax and reports the exact line and column of any parse error, optionally sorts all object keys alphabetically for consistent diffs, and can repair common JSON-like inputs that are technically invalid — such as trailing commas, JavaScript-style comments, and single-quoted strings.

Open JSON Formatter →

Text Case Converter

Naming conventions define how words are combined into identifiers in code, configuration files, APIs, and databases. camelCase (myVariable) is the standard in JavaScript and Java. snake_case (my_variable) is the norm in Python, Ruby, and SQL. kebab-case (my-variable) is used in CSS, HTML attributes, and URL slugs. PascalCase (MyVariable) is used for class names and React components across most languages. SCREAMING_SNAKE_CASE (MY_VARIABLE) marks constants. Different tools, frameworks, and languages enforce different conventions, so converting between them is a constant need when writing glue code, generating API clients, or adapting data from one system to another. This tool splits any identifier or phrase into its component words — intelligently handling camelCase boundaries, underscores, hyphens, and dots — then reassembles them in the target convention.

Open Text Case Converter →

Side-by-side comparison

Feature	JSON Formatter	Text Case Converter
Category	formatting	text
Primary purpose	Pretty-print or minify JSON — with syntax validation.	Convert text between camelCase, snake_case, kebab-case, PascalCase, and 7 other naming conventions.
Inputs	json, mode, indent, sort_keys, repair	input, to
Outputs	output, valid, error, error_line, error_column	output, tokens, from_detected

When to use each

Use JSON Formatter when…

How to pretty-print a JSON API response

Convert a minified or compact JSON API response into human-readable, indented output for inspection.

How to minify JSON for production

Remove all whitespace from a JSON file to reduce its size before embedding it in code, APIs, or config files.

Use Text Case Converter when…

How to convert camelCase to snake_case

Convert JavaScript variable names to Python or SQL naming conventions.

How to convert snake_case to camelCase

Convert Python or database identifiers to JavaScript naming conventions.

Frequently asked questions

What's the file size limit?: The API endpoint accepts up to 1 MB of JSON per request. For larger files, run the formatter locally: node -e "console.log(JSON.stringify(JSON.parse(require('fs').readFileSync('input.json','utf8')),null,2))"
Does it sort keys?: Yes — enable the 'Sort keys' option to sort object keys alphabetically at every level of nesting. Array element order is always preserved because arrays are ordered by definition.
How does the tool split compound words like 'innerHTML' or 'XMLParser'?: camelCase splitting uses two regex passes: first it inserts a space before any lowercase-to-uppercase transition (innerHTML → inner Html), then before any sequence of uppercase letters followed by an uppercase-then-lowercase transition (XMLParser → XML Parser). Both passes together correctly split 'XMLParser' into ['xml', 'parser'] and 'innerHTML' into ['inner', 'html'].
Does the tool preserve acronyms like 'URL' or 'HTTP'?: Acronyms are lowercased as part of tokenisation and then recased according to the target convention. In camelCase, 'parseURL' becomes 'parseUrl'; in PascalCase it becomes 'ParseUrl'. If your codebase uses a style guide that keeps acronyms uppercase (e.g. 'parseURL'), apply the conversion and then manually restore the acronym casing.