Developer
JSON Validator guide
Use this free JSON validator to check, format, minify, and copy JSON locally in your browser.
Paste JSON to validate its syntax, format it for reading, or minify it for compact output. It is built for quick developer and data-cleanup checks without sending text to a server.
Best for
- Checking JSON syntax errors.
- Formatting messy JSON for easier reading.
- Minifying JSON before copying it into a config, API client, or test fixture.
Not for
- Schema validation, API testing, or production data pipelines.
- Very large files that exceed browser memory or visible text limits.
How it works
- Paste JSON into the input.
- Validate, format, or minify it.
- Copy the cleaned JSON output.
Limits and privacy
The validator checks JSON syntax and formatting only. It does not validate against JSON Schema or call external APIs.
Common uses
- Find a missing comma or bracket in JSON.
- Pretty-print AI output or copied API responses.
- Minify a JSON config before pasting it elsewhere.
Useful facts
- Tiny Work Tools JSON Validator runs locally in the browser.
- It handles syntax validation and formatting, not schema validation.
FAQ
Can this validate JSON syntax?
Yes. Paste JSON and the tool will report whether it can be parsed as valid JSON.
Does it support JSON Schema?
No. It checks syntax and formatting only, not a schema contract.
Is pasted JSON uploaded?
No. The validation runs locally in your browser.