Is my JSON uploaded or stored?

No. The formatter runs in your browser. The pasted JSON is not uploaded, logged, stored, or sent to allthevalidators.com.

What indentation does the formatter use?

The output uses standard two-space indentation so nested objects and arrays stay readable in docs, reviews, and bug reports.

Is this a JSON validator too?

It parses before formatting and reports parse errors, but the dedicated JSON Validator is better for strict syntax triage and common invalid-JSON explanations.

Can it format minified API responses?

Yes. Paste a compact API response body or webhook payload and the tool expands it into readable lines with nested objects and arrays.

Does prettifying JSON change the data?

It should not change object values or array contents. It normalizes whitespace and quote style after parsing; if you need byte-for-byte preservation, keep the original too.

What should I use after formatting?

Use JSON Schema validation when you need required fields, allowed values, and data types; use JSON Minifier when you need compact output for a command or config value.

format validator

JSON Formatter & Prettifier

Format minified JSON into readable two-space indentation for API debugging, reviews, and docs—without uploading it.

Results

Paste input and validate locally.

Status: Ready when you validate.
Details: Ready when you validate.
Prettified JSON: Ready when you validate.

How to use this validator

Paste the minified JSON, API response, config blob, webhook sample, or fixture into the text area.
Run the formatter to parse the value locally and produce readable two-space indentation.
Copy the prettified JSON into a bug report, code review, documentation page, or editor before validating schema-level rules.
If parsing fails, fix the flagged syntax first or switch to the JSON Validator for stricter error triage.

Rules & checks

Parses JSON-like input with JSON5 tolerance for comments, trailing commas, single quotes, and unquoted keys, then outputs strict standard JSON.

Formats valid structures with consistent two-space indentation, line breaks, and normalized quotes.

Runs entirely in your browser, so pasted API payloads, config snippets, and fixture data are not uploaded or stored.

Best for readability and review; use the JSON Validator first when you need strict syntax-only feedback.

Inputs explained

JSON payload
Paste a complete object, array, primitive JSON value, API response body, webhook event, package/config snippet, or test fixture. Small and medium payloads format fastest in-browser.

When to use it

Make minified API responses readable before debugging application behavior
Prepare webhook payloads for code review, support notes, or documentation
Normalize JSON fixtures before committing them to source control
Format config blobs from package files, environment examples, CMS exports, or CI logs
Prettify JSON before diffing, schema validation, or sharing a sanitized sample

Common errors

Truncated API responses with missing closing braces or brackets
Copy/paste snippets that mix JSON, JavaScript object literals, and comments
Unescaped quotes, backslashes, tabs, or newlines inside string values
Unexpected commas or separators after manual edits
Huge payloads pasted into a browser tab when a local CLI would be safer

Limitations

Formatting changes whitespace and normalized quoting only; it does not prove the payload satisfies your API's business rules.
Lenient parsing can accept JSON-like snippets and output strict JSON, so use the JSON Validator when exact JSON compliance is the goal.
Large payloads can slow the browser because formatting happens locally on your device.
Does not fetch remote URLs or save a formatting history; paste the content directly and copy the result when done.

Tips

Validate strict syntax first when the payload came from a production API that rejects JSON5-style conveniences.
Remove or redact tokens, emails, customer IDs, and secrets before sharing the prettified result outside your team.
Use JSON Minifier after review if you need the same payload compact for curl commands, environment variables, or signed requests.
Use JSON Schema validation after formatting when the shape, required fields, or enum values matter.

Examples

Minified API response to readable JSON

{"id":101,"user":{"name":"Ada","active":true},"roles":["admin","editor"]} -> expands into indented object and array lines

Webhook payload for debugging

{"event":"invoice.paid","data":{"amount":4900,"currency":"usd"}} -> formatted for review or support tickets

JSON-like snippet normalized to standard JSON

{name:'Ada',active:true,} -> outputs double-quoted, strict JSON when the structure can be parsed

Invalid structure

{"name":"Ada", -> returns a parse error until the missing brace or token is fixed

Deep dive

This JSON formatter turns dense or minified JSON into readable, indented output for API debugging, webhook QA, documentation, and code review. The formatting step runs in your browser, so sensitive payloads do not need to leave your machine just to make them readable.

The tool is intentionally separate from schema validation. Format first when humans need to inspect the structure, validate strict syntax when parser compatibility matters, and use JSON Schema when you need field-level requirements or type checks.

For a complete local JSON workflow, prettify hard-to-read payloads, validate strict JSON syntax, minify when compact output is required, and compare or schema-check the result before shipping.

FAQs

Is my JSON uploaded or stored?: No. The formatter runs in your browser. The pasted JSON is not uploaded, logged, stored, or sent to allthevalidators.com.
What indentation does the formatter use?: The output uses standard two-space indentation so nested objects and arrays stay readable in docs, reviews, and bug reports.
Is this a JSON validator too?: It parses before formatting and reports parse errors, but the dedicated JSON Validator is better for strict syntax triage and common invalid-JSON explanations.
Can it format minified API responses?: Yes. Paste a compact API response body or webhook payload and the tool expands it into readable lines with nested objects and arrays.
Does prettifying JSON change the data?: It should not change object values or array contents. It normalizes whitespace and quote style after parsing; if you need byte-for-byte preservation, keep the original too.
What should I use after formatting?: Use JSON Schema validation when you need required fields, allowed values, and data types; use JSON Minifier when you need compact output for a command or config value.

Related validators

format

JSON Validator & Syntax Checker

Check JSON syntax, catch trailing commas and quote errors, and keep every payload local to your browser.

format

JSON Minifier

Minify JSON locally into compact, whitespace-free output for curl commands, environment variables, webhooks, signed requests, and config values.

format

JSON Diff Checker

Compare two JSON payloads locally to spot added, removed, or changed fields before API, webhook, or config changes ship.

format

JSON Schema Validator

Validate JSON Schema contracts with AJV, then test sample request or response JSON locally before you ship an API change.

format

XML Prettifier

Reformat XML with indentation for sitemaps, feeds, and configs.

All formatting runs locally in your browser. No JSON is sent, logged, or stored.

Formatting/readability helper only; does not enforce schemas, required fields, or business rules.