Question 1

How do I format JSON online for free?

Accepted Answer

Paste your JSON into JSONLens and click Format. JSONLens instantly pretty-prints and beautifies your JSON with syntax highlighting — no signup, no upload, 100% in your browser.

Question 2

How do I validate JSON online?

Accepted Answer

JSONLens validates JSON in real time as you type. Switch to the Validate tab for JSON Schema validation. Invalid JSON shows the exact line and column of the error.

Question 3

Is JSONLens free and private?

Accepted Answer

Yes. JSONLens is completely free and open source. Your JSON never leaves your browser — no accounts, no servers, no tracking.

Question 4

What JSON tools does JSONLens include?

Accepted Answer

JSONLens includes a JSON formatter, beautifier, validator, tree viewer, diagram graph, table view, diff/compare tool, minifier, transformer, visual editor, API client, and code generator — all in one free online tool.