Paste a JSON document
Use standard JSON with double-quoted property names and strings. Comments, trailing commas, and JavaScript expressions are not valid JSON.
Format and validate JSON in your browser
Pretty-print compact JSON, minify a valid document, or locate a syntax error without uploading the input. The formatter runs entirely in this browser.
Format or validate JSON locally
Paste JSON below. Formatting and validation happen on this device.
How to use format and validate json in your browser accurately
This json tool keeps input local, but its result still needs the human review described in the steps below before it is shared or used.
Format, minify, or inspect the error
Formatting adds two-space indentation; minifying removes unnecessary whitespace. Neither action changes values or validates application business rules.
Review sensitive values before sharing
Search headers, tokens, signatures, personal data, internal hosts, and signed URLs. A valid payload can still be unsafe to publish.
What this json tool does not do
This tool validates JSON grammar only. It does not apply JSON Schema, OpenAPI requirements, field-level permissions, payload-size rules, or an application's semantic constraints.
Before sharing the json result, read JSON pastebin guide for the matching context and privacy checks.
Format and validate JSON in your browser questions
Privacy, limits, and correct interpretation.
Does the JSON formatter upload my data?+
No. Parsing and formatting run locally in the browser. Data reaches Pastebin.ai only if you separately create a paste.
Can it validate JSON Schema?+
No. It checks JSON syntax, not required fields, types defined by a schema, or business rules.
Will formatting redact secrets?+
No. Formatting changes whitespace only; inspect and replace sensitive values yourself.
Other local tools after json
Choose another browser tool only when the next task changes from format and validate json in your browser to formatting, comparison, encoding, or measurement.
Compare two blocks of text line by line
Compare an original and changed block line by line without sending either version to the server. Use the result for a quick inspection, not as a replacement for version-control history.
Open tool →Encode and decode Base64 text locally
Convert UTF-8 text to Base64 or decode a Base64 value locally. Base64 is a transport representation, not a confidentiality or access-control mechanism.
Open tool →Find and redact secrets before you paste
Check code, logs, configuration, and HTTP transcripts for common credential shapes before sharing. Detection and redaction run in this browser, and no input is uploaded.
Open tool →Count the words, characters, lines and bytes in any text
Measure visible writing and actual UTF-8 storage size as you type. Counts update locally and help you check a text block before creating a paste.
Open tool →Percent-encode and decode URLs locally
Percent-encode a URL component or decode an encoded value without uploading it. Use this tool for query values, paths, callback parameters, and sanitized HTTP examples.
Open tool →Free local JWT decoder for headers and claims
Inspect the Base64URL-encoded header and payload of a three-part JSON Web Token in this browser. The decoder never verifies the signature and never proves that a token is authentic or safe to trust.
Open tool →Unix timestamp converter for logs and APIs
Convert Unix seconds, Unix milliseconds, or an ISO 8601 date into UTC, local time, seconds, and milliseconds. Processing stays in the browser for safer log analysis.
Open tool →Generate a SHA-256 hash of any text
Create a lowercase SHA-256 digest from the exact UTF-8 bytes of a text block. Hashing runs through the browser Web Crypto API and does not upload the input.
Open tool →Local text cleaner for lines and whitespace
Prepare a text list or copied diagnostic block locally by trimming trailing spaces, compacting blank lines, removing duplicate lines, or sorting lines. Every action changes text, so review the result before replacing a source artifact.
Open tool →