Does this tool send my JSON anywhere?

No. Formatting happens locally in your browser tab. Your JSON never touches a server.

Can it fix invalid JSON automatically?

No — invalid JSON is reported with a precise error location so you can fix it correctly. Silent auto-repair would risk changing the meaning of your data.

What's the maximum size?

There's no hard limit; multi-megabyte inputs work fine on modern browsers.

Does it support JSON5 or comments?

The formatter targets strict JSON per RFC 8259. Comments and trailing commas will be reported as errors.

What is the difference between 2-space and 4-space indentation?

Two-space indentation is the JavaScript ecosystem default and keeps lines short in deeply nested documents. Four-space indentation is common in Python and Java codebases and reads slightly better in shallow structures. Tabs let every developer's editor render whatever width they prefer. All three produce byte-different but semantically identical JSON.

Can I use the formatter purely as a validator?

Yes. The tool always validates before it formats, so if no error banner appears your document is valid JSON. You can ignore the formatted output entirely and treat the absence of an error as the verdict.

JSON Formatter & Beautifier

Paste any JSON payload and instantly get a formatted, human-readable version with the exact indentation you need. Structural errors are highlighted with line and column numbers, so you can jump straight to the missing comma or misplaced brace.

Last updated: 2026-07-21 · Runs 100% in your browser

indent:

Input0 chars · 0 lines

Output

Result will appear here.

// What is the JSON Formatter?

The JSON Formatter pretty-prints raw or minified JSON into a clean, indented structure that a human can actually read. It parses your input against the strict JSON grammar first, so a document only reaches the output pane once it is provably valid; if parsing fails, you get the line and column where the parser gave up instead of a vague "invalid JSON" message. Indentation is configurable between two spaces, four spaces and tabs so the output matches whatever convention your repository already uses. Because the parser is the browser's own JSON engine running inside your tab, formatting a production API response involves no upload, no queue, and no third-party log entry — the work finishes in the time it takes the page to repaint.