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JSON Formatter & Validator

Turn compact or uneven JSON into readable structured data. Validation happens before output, so syntax problems surface without sending your payload anywhere.

Your data stays in this browser
Local-firstYour data stays in this browser

FIELD NOTES

Why format JSON?

JSON is a text format for structured data used by APIs, configuration files and application storage. Whitespace does not change its meaning, but consistent indentation makes nested objects easier to inspect.

The formatter parses the full input before rendering it. A successful result is valid JSON; an error points to malformed syntax such as missing quotes, commas or braces.

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Base64 Encoder & Decoder

Encode Unicode text to Base64 or decode it back safely.

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JWT Decoder

Inspect JWT headers, payloads and expiration times locally.

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16

CSV to JSON Converter

Convert header-based CSV to JSON and JSON arrays back to CSV.

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REFERENCE

JSON questions

Is my JSON uploaded?

No. Parsing and formatting run entirely in your browser.

Does formatting change values?

No. It changes whitespace only. Minifying also preserves the parsed values.

What indentation is used?

Formatted output uses two spaces per nesting level.