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JSON5 Validator — Check JSON5 Syntax With Error Reporting

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

Free No signup Client-side Privacy friendly Updated
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.

What is JSON5 Validator?

A JSON5 Validator is a tool that checks whether text conforms to the JSON5 specification and reports syntax errors with line and column positions. It accepts JSON5 features that standard JSON rejects, including comments, trailing commas, single-quoted strings, and hexadecimal numbers. Running client-side in the browser, it validates and parses JSON5 input without uploading it to a server.

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.

Learn the basics

What is JSON?

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