Batch JSON Validator

Drop as many .json files as you like and validate all of them at once, right in your browser. See which files pass, which fail, and exactly where each error is - nothing is uploaded anywhere.

Drop JSON files here, or click to browseMultiple files supported - everything stays in your browser

What this tool does

This checks JSON syntax across many files at once instead of one at a time - useful for validating a folder of config files, API fixtures, or exported data before a deploy or migration. Each file is parsed independently; a problem in one file doesn't stop the rest from being checked.

Step-by-step

Drag a folder's worth of .json files onto the drop zone, or click it to browse.
Every file is validated immediately - see a pass/fail count at the top.
Click any failed file to expand its exact error, including line and column.

Privacy

All parsing happens locally in your browser. Files are never uploaded, and nothing is retained after you leave the page.

Need to validate against a schema, or just check a single file? Try our JSON Schema Validator or single-file Validator.

FAQ

What does the Batch JSON Validator check?: It checks that each file you drop is syntactically valid JSON - the same check as our JSON Validator, run across every file at once instead of one at a time.
How many files can I validate at once?: There's no hard limit - drop as many .json files as you like. Very large batches (hundreds of files, or individually huge files) will take longer since everything runs in your browser's memory.
Does this validate against a JSON Schema too?: Not yet - this checks JSON syntax only. To validate files against a schema, use our JSON Schema Validator one at a time for now.
Are my files uploaded to a server?: No. Every file is read and parsed locally in your browser. Nothing is uploaded, logged, or stored.
Can I see the exact error in an invalid file?: Yes - click a failed file's row to expand its error message, including the line and column where the parser stopped, when available.
Can I validate YAML or XML files in batch?: Not yet - the batch validator currently supports JSON only. Use our single-file Validator for YAML and XML.
Is my data uploaded to a server?: No. All tools run locally in your browser; your data isn't sent to any server.
Can I use the tool offline?: After the page loads once, most browsers will allow basic offline usage because processing is entirely client-side.
Can I beautify JSON?: Yes - use the Beautify actions in each tool where applicable.
Do you keep my files?: No. All tools run locally in your browser; data is not uploaded to any server.
Is there a size limit?: Large inputs are limited by your browser memory; for most cases typical files work fine.
Is it free?: Yes, All tools are 100% free and no sign-up required.