JSON Formatter & Validator

1. 1Paste JSON into the input panel, or press Sample.
2. 2Choose a mode (Beautify, Minify, Validate only) and an indent. The result updates as you go.
3. 3Press Copy to copy the result, or Download to save it as a .json file.

Mode

Beautify breaks lines and indents. Minify removes all whitespace. Validate only prints nothing and just reports whether the JSON is valid, with its type, key count, and depth.

Indent

2 spaces (default), 4 spaces, or a tab. Used in Beautify mode only.

Sort keys

Sorts object keys by Unicode code point. Nested objects are sorted too. The order of array items is never changed.

Escape non-ASCII as \uXXXX

Rewrites non-ASCII characters as \uXXXX escapes. When off (default), strings are kept exactly as written.

• Beautify one-line JSON (defaults: Beautify, 2 spaces)

  The number 1.0 stays 1.0. It is not rewritten as 1.

  Input

  {"name":"ZEKILO","tools":["json","base64"],"version":1.0,"beta":true}

  Output

  {
    "name": "ZEKILO",
    "tools": [
      "json",
      "base64"
    ],
    "version": 1.0,
    "beta": true
  }

• An integer larger than 2^53

  JSON.parse in JavaScript would turn this value into 12345678901234567000.

  Input

  {"n":12345678901234567890}

  Output

  {
    "n": 12345678901234567890
  }

• Sort keys + Minify

  Input

  {"b":1,"a":{"d":2,"c":3}}

  Output

  {"a":{"c":3,"d":2},"b":1}

• Trailing comma error

  Input

  {"a":1,}

  Output

  Line 1, column 8 · A trailing comma is not allowed in JSON.

Examples use the reference cases this tool is tested against.

• JSON ↔ YAML ConverterConvert JSON to YAML and YAML to JSONUse it
• JSON ↔ CSV ConverterTurn JSON arrays into spreadsheet-ready CSV and backUse it
• JWT DecoderRead the header, payload, and expiry of a JWTUse it