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JSON Formatter

Format, minify, validate, inspect, and copy a safe API response report for JSON payloads without sending them to a server.

Runs in your browserNothing you type is sent to a server.

Input and result

What you type is kept in this browser only. Reopen to restore your last run.

Use cases

  • Format compact API responses before copying them into code or docs
  • Copy an API response report with structure, diagnostics, useful JSON paths, and safe sharing checks
  • Turn a DevTools Network response body into a redacted Markdown handoff report
  • Validate JSON syntax and locate parse errors quickly
  • Find the line, column, and local context for a JSON parse error
  • Review sensitive-looking keys, empty values, duplicate keys, and large arrays before sharing
  • Minify JSON for fixtures, test payloads, and small transport values
  • Inspect root type, nesting depth, and top-level keys before converting the payload
  • Extract and copy a single nested field with dot or bracket paths

Examples

Common input
{"status":"ok","items":[1,2,3]}
Paste compact API payloads to format, inspect, or turn them into a response report.
Typical output
{ "status": "ok" }
Use this as a quick sanity check before copying results.
API error response
{"error":{"code":"invalid_request","message":"Missing id"},"requestId":"req_123"}
Useful for formatting copied API failures and copying a redacted response report.
Feature flag payload
{"flags":{"newCheckout":true,"theme":"system"},"env":"staging"}
Checks nested keys and booleans before moving the payload into fixtures.

Common mistakes

  • Trailing commas, comments, or single quotes make browser JSON parsing fail.
  • A huge pasted response contains secrets, tokens, or customer rows that should be redacted first.
  • Dates, IDs, and large numbers can look valid but still be wrong for the downstream schema.

Before you copy

  1. 1Validate first, then choose formatted or minified output for the next tool.
  2. 2Remove bearer tokens, cookies, customer IDs, and private endpoint values.
  3. 3Compare the output shape with the API contract before copying it into code or docs.

Sources

  • It is Cicero, cut mid-word so it means nothing

    `Lorem ipsum dolor sit amet` comes from De finibus bonorum et malorum 1.10.32 — `Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet…` — chopped in the middle of a word. It does not read as Latin either, which is the point: nobody should read it.

    Basis: Cicero, De finibus bonorum et malorum 1.10.32

  • Filling a mock-up with real sentences skews the length

    Latin has a different word-length distribution from English, German or CJK. To judge line breaks and character counts, use placeholder text in the language the page will ship in.

    Basis: Typesetting practice

FAQ

Does JSON Formatter upload my input?

No. This tool runs in your browser unless the privacy badge explicitly says a server route is required.

Can I use this for production secrets?

Avoid pasting sensitive production data into any website. Prefer local test data or redacted payloads.

Why does pasted JSON fail even when it looks close?

Common causes are trailing commas, comments, single quotes, unescaped newlines, and copied log prefixes before the JSON value.

Should I format production API responses here?

Use redacted samples. Remove tokens, cookies, customer IDs, internal URLs, and any one-off environment values before pasting or copying the API response report.