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JSON5 Validator

Validate JSON5 with line and column error reporting. Supports comments, trailing commas, single quotes, hex numbers.

Free No signup Client-side Privacy friendly
Valid JSON5 Awaiting input Parsing…

How to use

  1. 1 Paste your JSON5 — comments, trailing commas, single quotes all welcome.
  2. 2 See the green Valid pill, or a red error pill with line and column.
  3. 3 The right pane shows the parsed value as standard JSON.
  4. 4 Copy or download the JSON output.

Why use this tool

  • Powered by <code class="font-mono text-xs">json5</code> — the reference JSON5 implementation.
  • JSON5 lets you author config files with comments, trailing commas, hex numbers, and more.
  • Errors include line and column so you can find them fast.
  • Pure client-side — input stays in your browser.

Frequently asked questions

What is JSON5?

JSON5 is a superset of JSON with extensions: comments, trailing commas, single-quoted strings, unquoted keys, hex/Infinity/NaN literals, and more.

Is JSON5 the same as JSONC?

No — JSONC (VS Code's "JSON with comments") only adds comments. JSON5 also adds trailing commas, unquoted keys, single quotes, etc.

Related tools?

<a class="text-brand-600 hover:underline" href="/json-formatter">JSON Formatter</a> for strict JSON; <a class="text-brand-600 hover:underline" href="/yaml-formatter">YAML Formatter</a> if you want full YAML.

Summary

JSON5 Validator is a free developer utility by Zerethon Tools. Validate JSON5 with line and column error reporting. Supports comments, trailing commas, single quotes, hex numbers. Runs entirely in the browser — no signup, no upload.

Category
Developer
Pricing
Free
Privacy
Browser-based
Signup
Not required

Privacy

Your data never leaves your browser unless explicitly stated. JSON5 Validator runs entirely client-side — no server upload, no logging, no tracking of your input.

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