LLM API Cost Calculator
Compare monthly API costs across OpenAI, Anthropic, Gemini, and DeepSeek.
JSON Validator & Linter
Check syntax and flag broken brackets or commas.
⟨/⟩ Embed this tool on your site
Paste this into any page — the live tool appears with a credit link back here.
✏️ Sketching your tool…
Sponsored: Recommended offer →
About JSON Validator & Linter
Validate JSON and get a readable error message, plus pretty/minified output.
📐 Methodology & Reference Accuracy:
Calculations, formulas, and conversions execute locally in your web browser. Output models are benchmarked against official reference standards and updated for 2026.
🔒 This tool runs entirely in your browser. Nothing is uploaded or stored.
Background reading: Json Validator on Wikipedia. More: all developer tools.
Frequently Asked Questions about JSON Validator & Linter
How do I use the JSON Validator & Linter?
Open the JSON Validator & Linter and use the controls in the workspace below: check syntax and flag broken brackets or commas. Results appear instantly in your browser, with nothing to install, sign up for, or pay for.
Is the JSON Validator & Linter free?
Yes. The JSON Validator & Linter is completely free, like every tool in the PrimeFreeTools library. There are no accounts, subscriptions, or usage limits.
Does the JSON Validator & Linter store or share my data?
No. The JSON Validator & Linter runs with JavaScript in your browser, so what you enter never leaves your device and nothing is stored on a server.
What can I use the JSON Validator & Linter for?
Validate JSON and get a readable error message, plus pretty/minified output. You will find it grouped under Developer Tools together with 78 other free tools on the PrimeFreeTools homepage.
Related Articles & Guides
Sep 8, 2026
JSON Validator: Find the Missing Comma in Ten Seconds
Check syntax and flag broken brackets or commas.
Read post