The Free Better JSON Formatter
that actually works.
Most JSON tools crash when you leave a trailing comma, miss a closing bracket, or forget a quote. Our Better JSON Formatter automatically fixes broken syntax and instantly generates production-ready TypeScript Interfaces in a powerful 3-pane editor.
Intelligent JSON Validation & Parsing
Automatically repair broken syntax and instantly generate production-ready TypeScript types from any raw JSON data.
The Better JSON Formatter Engine
Accidentally pasted JSON with missing closing brackets, trailing commas, unquoted keys, or JavaScript comments? Instead of throwing a generic SyntaxError, our Better JSON Formatter uses advanced heuristics to automatically repair the payload for you.
TypeScript Generator
Don't waste time writing interfaces by hand. As soon as you paste an API payload, our Better JSON Formatter instantly infers the schema and generates a perfectly typed TypeScript interface.
Powerful 3-Pane Layout
Experience a superior workflow. View your raw input, the perfectly formatted output, and the generated typings all on a single, lightning-fast screen.
Auto-Closing Brackets
Missed a closing brace at the very end of a 5,000-line JSON payload? Our deep-parsing engine detects unterminated objects and arrays and automatically closes them for you.
Comment Stripping
Unlike strict JSON, our engine allows you to safely paste raw JavaScript objects that include // single-line or /* multi-line */ comments. It strips them out automatically.
100% Client-Side Privacy
Your API payloads and secret database exports are never sent to a server. The formatting, syntax repair, and TypeScript generation happen completely offline in your browser.
Why use the Better JSON Formatter?
If you are a developer, you have experienced this exact scenario: You copy a massive JSON payload from a browser console or a Slack message, paste it into a web formatter, and get hit with a red SyntaxError: Unexpected token }.
JavaScript natively allows trailing commas and unquoted keys, but the strict JSON specification does not. Instead of helping you find and fix the one missing quote in a 5,000-line payload, basic formatters just give up. We built the Better JSON Formatter to solve this exact problem.
How the Better JSON Formatter Engine Works
Instead of relying on the native JSON.parse() method, which is unforgiving and strict, our Better JSON Formatter utilizes a highly advanced JSON repair algorithm.
When you paste "dirty" code, the Better JSON Formatter scans the syntax tree to fix missing closing braces (`}`), missing array brackets (`]`), strip out JavaScript comments (`//`), convert single quotes to double quotes, and wrap unquoted keys. It effortlessly sanitizes the broken code and re-serializes it into perfectly valid, strict JSON, saving you from hunting down syntax errors manually.