▚ sandboxmax

Malformed JSON Syntax Fixer

Pre-loaded with the two classic breakages: a trailing comma and a missing closing bracket. The diagnostic banner below the input pinpoints the exact line and column where parsing gives up — fix the errors one by one and watch the banner flip green. Your broken config never leaves this tab.

runs 100% in your browser — payloads stay private

  1. 1Paste your JSONRaw, messy, or broken — the diagnostic banner shows the exact line and column of any syntax error.
  2. 2Fix & formatBeautify with tab indentation or flatten to a minified single line, with live byte savings.
  3. 3Query with pathsType servers[0].metrics.cpu-style paths to extract just the branch you need from big payloads.

Formatted output

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Parsed with your browser’s native JSON.parse — nothing you paste here is uploaded, logged, or sent anywhere.

More JSON tools

/json/query-large-nested-api-payload

Nested API Payload Path Finder

/json/minify-json-config-file

JSON Config File Minifier

Is it safe to paste sensitive data into the Malformed JSON Syntax Fixer?

Yes. The Malformed JSON Syntax Fixer runs 100% client-side inside your browser thread — nothing you paste is uploaded, logged, or transmitted. SandboxMax is a static site with no backend server, no cookies, and no trackers: open your browser's network panel while you work and you'll see zero requests leave the tab.