UUUP Tools

Data Tools

JSON Formatter and Validator Online

Format, minify, sort, and validate JSON in your browser. Parsing errors include location details, and your data never leaves the page.

Quick switch→JSON Validator
JSONFormatterDeveloper
Quick switch:JSON ValidatorJSONPath Query

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Use cases

  • Beautify API responses for easier review
  • Check configuration files for valid JSON syntax
  • Minify multiline JSON for code or command-line use

How to use

  1. Paste JSON into the input editor
  2. Choose Format, Minify, or Sort Keys
  3. Copy or export the processed JSON

Example input and output

JSON input

{"name":"uuup","stack":["astro","cloudflare"]}

Formatted JSON

{
  "name": "uuup",
  "stack": [
    "astro",
    "cloudflare"
  ]
}

FAQ

Does it show where JSON parsing failed?

Yes. Parsing errors include available line, column, or character-position details to help locate common syntax mistakes.

Is pasted JSON uploaded?

No. Formatting and validation run entirely in your browser, so the data stays on the current page.

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