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Private browser tool

JSON Formatter

Format or minify JSON free in your browser. Validate syntax, make nested data readable and copy the result without sending private JSON to a server.

✓ Local processing✓ No uploads✓ No account
  1. 1Add input
  2. 2Choose options
  3. 3Get result

Private on this device

Filemivo uses browser APIs to process your input on this device. File contents, filenames and metadata are not sent to our server or analytics.

Next step

Continue working with your file

Browse all tools →
JSON→

Validate JSON

Validate JSON syntax and locate errors.

JSON→CSV
→

JSON to CSV

Convert arrays of JSON objects into CSV.

JSON→YAML
→

JSON to YAML

Convert valid JSON into readable YAML.

Simple by design

From file to result in three steps

  1. 1

    Paste JSON into the input area.

  2. 2

    Leave Minify unchecked for two-space indentation, or check it for compact output.

  3. 3

    Review the result, then copy or download it.

Practical guidance

When to use Format JSON

Best for

Reading compact API responses, normalizing indentation or creating a smaller one-line JSON value.

What you get

Parsed JSON written with two-space indentation, or minified onto one line.

Useful tip

Parsing can normalize number notation, round large integers and collapse duplicate object keys. Keep the original when exact representation matters.

Formatting makes structure visible

Indentation exposes nested objects and arrays, which makes misplaced values and unexpected nesting easier to spot. Use minification only after the data is valid and ready for a compact destination.

Validation and formatting are different checks

A formatter confirms that the text is syntactically valid JSON. It cannot confirm that required fields exist or that values match the schema expected by an API.

Learn how local data tools protect input →

Good to know

Frequently asked questions

Does the formatter change my JSON values?+

It parses and serializes JSON using JavaScript. Integers beyond the safe number range can lose precision, duplicate object keys keep only their last value, and numeric property names can be reordered. It is not a byte-preserving formatter.

Can it fix invalid JSON automatically?+

No. Invalid syntax is reported instead of guessed. Correct missing quotes, commas or brackets and run the formatter again.

What is minified JSON?+

Minified JSON removes unnecessary spaces and line breaks while keeping the data valid. It is convenient for transport but harder for people to read.

Is pasted JSON uploaded?+

No. Parsing and formatting happen inside your browser, and the JSON content is not sent to Filemivo.

Does my file leave my device?+

No. This tool processes your file inside your browser and does not send its contents, name or metadata to Filemivo.

Is Format JSON free?+

Yes. It is free to use and has no artificial file-size limit. Your browser and device memory determine the practical limit.