DEVELOPER UTILITY

JSON
VALIDATOR

Validate JSON instantly, find syntax errors, and check whether your JSON is valid before using it.

100% CLIENT-SIDE. INSTANT SYNTAX CHECK.

Enter JSON and click "Validate JSON" to check syntax.

All validation runs locally in your browser with zero server calls.

HOW IT WORKS

PASTE JSON

Paste your JSON string or configuration object into the editor workspace.

VALIDATE SYNTAX

Click Validate JSON to verify compliance against the official JSON specification.

REVIEW RESULTS

Instantly inspect whether your data is valid along with exact error line and column indicators.

FEATURE HIGHLIGHTS

ALL ROOT TYPES SUPPORTED

Fully compliant with objects, arrays, primitives, booleans, strings, and null root values.

100% PRIVATE & LOCAL

Zero server transmission and zero logging. Your application payloads remain strictly inside your browser.

CLEAR VALIDATION RESULTS

Check whether your input parses as JSON and review the reported result.

COPY YOUR JSON

Copy the input JSON directly from the workspace for use in your project.

CLIENT-SIDE PRIVACY

ManyTinyTools operates browser-first. Your JSON data remains strictly inside local browser memory and is never uploaded, recorded, or sent to analytics.

LOCAL
INPUT

BROWSER
MEMORY

SYNTAX
RESULT

RELATED DEVELOPER TOOLS

JSON Formatter JSON Minifier JSON to CSV CSV to JSON XML Formatter HTML Formatter CSS Formatter JS Formatter

FREQUENTLY ASKED QUESTIONS

How do I validate JSON?

What JSON root types are supported?

Is my data secure?

JSONVALIDATOR