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JSON Viewer Online — Interactive Tree View & Inspector
Inspect complex nested API responses with an interactive, collapsible JSON tree view. Search nodes, inspect data types, and navigate deep objects effortlessly.
Private & Offline Ready
Every tool runs in your browser, so the JSON you paste never leaves your device.
Works Instantly, Even Offline
Formatting, minifying, repairing, and the tree view all run on your device, so there are no uploads to wait on.
Exact Error Line & Column
Syntax errors like unescaped quotes and trailing commas are flagged with their exact line and column.
Exploring Large JSON with an Interactive Tree View
How a collapsible tree makes deeply nested API responses easy to navigate, search, and understand.
1. Reading Deeply Nested JSON
Big API responses, database dumps, and GraphQL results can nest objects and arrays many levels deep. In plain text you have to count indentation to work out which key belongs to which parent. The tree view turns the same data into an interactive outline: every object and array becomes a branch you can expand or collapse, values are shown with their type, and arrays show how many items they contain. That makes it easy to see the shape of the data without scrolling through everything.
Technical Highlights
- Shows deeply nested JSON as an expandable, collapsible outline.
- Values are labelled by type, and arrays show their item count.
- You can see the structure without reading every line.
2. Expanding and Collapsing Branches
Each branch in the tree can be opened or closed on its own, and there are controls to expand or collapse everything at once. When you are looking at a response with a long array of log entries, you can collapse that array to get it out of the way and focus on the fields you care about. Reopening a branch shows its children again exactly as before. This makes a large, noisy payload manageable without editing or deleting anything.
Technical Highlights
- Open or close any branch individually, or expand and collapse all at once.
- Collapse long arrays to focus on the fields you need.
- Nothing is changed — collapsing only hides, it does not delete.
3. Searching Keys and Values
The tree view includes a search box that filters the tree as you type. Enter a key name or a value like "user_id" or "status" and it highlights the matches and opens the branches that lead to them, so you do not have to hunt through the structure by hand. Everything happens in your browser, so even large or sensitive payloads stay on your machine.
Technical Highlights
- Search filters the tree and highlights matching keys and values.
- Matching branches expand automatically so you can find data fast.
- Search runs locally, so nothing is uploaded.
Frequently Asked Questions
Common questions and expert answers regarding this tool.
What is a JSON Tree Viewer?
A JSON tree viewer shows your JSON as an expandable outline instead of plain text. Objects and arrays become branches you can open and collapse, with values labelled by type — handy for exploring large API responses.
How do I search inside the JSON tree?
Use the search box in the tree panel. As you type, it highlights matching keys and values and opens the branches that lead to them, so you do not have to scroll through everything.
Why use Tree View instead of plain text for big responses?
A response with thousands of lines is hard to scan as text. In tree view you can collapse the parts you do not need, focus on specific branches, and find fields by searching.