19 free browser tools

JSON Tools Suite

Format, validate, compare and convert JSON — instantly, privately, in your browser.

19 tools, one hub Local file tools; service requirements vary Works on any device

How do you format, validate and convert JSON online safely?

Paste or drop your JSON into the tool you need below — beautifier, validator, diff, JSONPath tester or a converter to CSV, YAML or SQL. The browser JSON tools parse documents locally. The separate developer API transmits requests to an online service and requires an account. Error details depend on the parser and tool.

Format & validate

5 tools

JSON Beautifier

Popular

Pretty-print and validate JSON instantly

JSON Minifier

Strip whitespace for smaller payloads

JSON Path Tester

Test JSONPath expressions against live data

JSON Case Converter

Switch keys between camel, snake and kebab case

JSON Diff

Popular

Compare two JSON documents structurally

Convert JSON

9 tools

JSON to CSV

Popular

Flatten nested JSON into spreadsheet rows

XML to JSON

Popular

Convert XML to JSON with CDATA and attributes kept

JSON to XML

Popular

Build well-formed XML with attributes and CDATA

CSV to JSON

Generate JSON or nested objects from CSV

JSON to YAML

Readable YAML for configs and CI files

YAML to JSON

Convert YAML configs back into JSON

JSON to SQL

INSERT statements and schemas from JSON

SQL to JSON

Turn query output into JSON records

CSV to JSONL

Line-delimited JSON for AI training data

Developer utilities

5 tools

JWT Generator

Create and inspect JSON Web Tokens

Webhook Tester

Inspect JSON payloads from any webhook

Schema Validator

Validate data against a JSON schema

YAML Validator

Catch YAML syntax errors instantly

Developer API

Run these conversions from your own code

How it works

  1. 1

    Choose a JSON tool

    Format, validate, compare or convert — each tool is a single focused page.

  2. 2

    Paste JSON or upload a file

    Syntax errors are flagged with the exact position before anything else runs.

  3. 3

    Copy or download the result

    Grab the output as text or a file, or automate the same job with our developer API.

Pick the right JSON tool

The most common JSON jobs, the tool that solves each one, and what comes out the other end.

Pick the right JSON tool
GoalToolInputOutput
Read an ugly API responseJSON BeautifierRaw JSONIndented, validated JSON
Shrink a payload for productionJSON MinifierJSONWhitespace-free JSON
See what changed between two responsesJSON DiffTwo JSON docsStructural diff
Extract a nested valueJSON Path TesterJSON + JSONPathMatched nodes
Open JSON in Excel or SheetsJSON to CSVNested JSONFlattened CSV
Write a Kubernetes or CI configJSON to YAMLJSONReadable YAML
Seed a databaseJSON to SQLJSON arrayINSERT statements
Check a payload against a contractSchema ValidatorJSON + JSON SchemaPass / fail with errors

Why people use these tools

File conversion and cleaning process files in your browser

Limits vary by tool; CSV to PDF includes first-page attribution

Local processing requires the tool and its resources to be loaded

Separate developer API with account, quotas and plans

Read the privacy policy or automate these jobs with the developer API.

Frequently asked questions

Everything people ask before using these tools — privacy, file limits, formats and how each job is done.

Yes. JSON is parsed and formatted in your browser; nothing is sent to a server or logged, so API responses containing tokens or personal data stay on your machine.

Yes — the JSON to CSV tool flattens nested objects and arrays into columns you can rename or drop before exporting.

The developer API has a separate documented endpoint inventory, account requirements and free or paid quotas. Not every browser tool has an API equivalent.

Paste the minified payload into the JSON Beautifier and it re-indents the structure instantly, reporting the exact line and character of any syntax error it finds.

The beautifier and validator parse your input and point to the first invalid token with its position, which is usually a trailing comma, an unquoted key or a smart quote pasted from a document.

JSON Diff compares two documents structurally rather than line by line, so key order does not matter. Added, removed and changed values are highlighted per path.

JSONL (line-delimited JSON) stores one JSON object per line. It streams well and is the expected format for AI fine-tuning datasets and log pipelines — use the CSV to JSONL tool to produce it.

Yes. The JSONPath Tester evaluates expressions live against pasted JSON and shows the matched nodes, which is handy when building integrations or automation filters.

The JSON Case Converter rewrites every key — including nested objects and arrays — between camelCase, snake_case, kebab-case and PascalCase in one pass.

No. Minifying only removes whitespace and line breaks; the parsed value is identical, with a size reduction that depends on the original whitespace.

File upload limits depend on the JSON tool; some uploaders enforce a 10MB cap. Local processing is also limited by available browser memory. Check the tool before loading large files.

Explore other tool categories

Explore browser tools by category. Connected services have their own account and network requirements.

CSV Tools

22 tools

Convert, clean, merge & query CSV files

PDF Suite

Merge, split, compress, sign & secure PDFs

Excel Tools

10 tools

Unprotect, protect & convert workbooks

Image Tools

Convert, compress & resize photos — HEIC, JPG, PNG, WebP

Browse all tools

The complete directory of every free data, document and developer tool on the site.