JSON Formatter
Paste raw or minified JSON to pretty-print it with clean, readable indentation, or strip it down to a single compact line. Runs entirely in your browser — nothing you paste is uploaded anywhere.
Save your student profile to track computations, past questions & GPA targets.
JSON formatter
How It Works
The formatter parses your input with the browser's built-in JSON.parse, which fails loudly on anything that isn't valid JSON, then re-serializes the parsed data with JSON.stringify — using an indent width for "Format" or no indent at all for "Minify". Because it round-trips through a real parser rather than just re-indenting text, the output is guaranteed to be syntactically valid JSON as long as your input was.
MyDelsu is an independent student platform and is not affiliated with DELSU administration. This tool is provided for guidance only — always verify results against your official transcript, result slip, or academic regulations.
Frequently Asked Questions
Is my JSON uploaded to a server?+
No. Parsing and formatting happen entirely in your browser using JavaScript's built-in JSON.parse and JSON.stringify — nothing you paste is sent over the network.
Why does it say my JSON is invalid when it looks fine?+
Common causes are trailing commas after the last item in an object or array, single quotes instead of double quotes around strings/keys, unquoted keys, or a missing comma between items — none of these are valid in strict JSON even though they're often accepted in JavaScript object literals.
What's the difference between this and the JSON Validator?+
They share the same underlying parser. This page is built around formatting (pretty-print and minify); the JSON Validator page is built around a clear valid/invalid check with the exact error position — use whichever matches what you need.
Can I format very large JSON files?+
Yes, up to whatever your browser tab's memory can comfortably hold — there's no artificial size limit imposed by the tool itself, but extremely large payloads (tens of megabytes) may feel slow since parsing happens on the main thread.