JSON Formatter & Validator
Format, minify, and validate JSON instantly.
Building webhook payloads?
Recuro delivers JSON payloads on a schedule. Configure headers, body, and cron expression in one place.
What is JSON formatting?
JSON (JavaScript Object Notation) is the dominant data interchange format for web APIs, configuration files, and data storage. While machines can parse compact JSON efficiently, developers need readable formatting — consistent indentation, line breaks, and aligned brackets — to understand the structure at a glance.
Pretty-printing adds whitespace to make nested objects and arrays visually clear. Two-space and four-space indentation are the most common conventions. Minification does the opposite — it strips all unnecessary whitespace to produce the smallest possible payload, which is ideal for network transfer and production APIs.
Validation checks that the text conforms to the JSON specification (RFC 8259). Common errors include trailing commas, single-quoted strings, unquoted keys, and JavaScript-style comments — all valid in JavaScript but not in strict JSON.
Working with JSON payloads in scheduled HTTP jobs? Recuro lets you configure request bodies, headers, and cron schedules with built-in logging so you can inspect every response.
Frequently Asked Questions
How do I fix invalid JSON?
Common JSON issues include trailing commas after the last item in an array or object, single quotes instead of double quotes around keys and strings, unquoted property names, and comments (JSON does not support comments). This tool highlights the exact position of syntax errors to help you find and fix them quickly.
What's the maximum JSON size this tool handles?
This tool runs entirely in your browser, so there is no upload limit. It comfortably handles files up to several megabytes. For very large files (10MB+), you may notice a brief delay during formatting. No data is ever sent to a server.
What's the difference between JSON.parse and JSON.stringify?
JSON.parse() takes a JSON string and converts it into a JavaScript object. JSON.stringify() does the reverse — it takes an object and serializes it into a JSON string. JSON.stringify accepts optional replacer and space arguments, where the space argument controls indentation for pretty-printing.
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