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通过 request.get_json 读取 JSON 正文

解析 API 客户端发送的 JSON 负载

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本课时的部分内容尚未翻译，以英文显示。

APIs Speak JSON

Modern clients often send a JSON body instead of form fields, so you need a different way to read the payload in Flask.

Call request.get_json

Use request.get_json and Flask parses the raw JSON body into a regular Python dict you can work with directly.

data = request.get_json()

You Get Native Python Types

After parsing you have real Python types: dicts, lists, ints, and booleans, so no manual string conversion is needed.

price = data["price"]  # already a number

Read Keys Safely

The parsed body is a dict, so reach for .get on it to avoid KeyError when an expected field is absent from the payload.

name = data.get("name")

The Content-Type Must Be JSON

By default Flask only parses the body when the request carries a application/json content type header.

Force Parsing With force

If a client forgets the header, pass force=True so get_json parses the body anyway instead of returning None.

data = request.get_json(force=True)

Silence Errors With silent

Bad or empty JSON normally raises a 400. Pass silent=True to get None back so you can handle it on your own terms.

data = request.get_json(silent=True)

Quick Truthy Check: is_json

Branch on request.is_json first to confirm the client actually sent JSON before you try to parse the body.

if request.is_json:
    data = request.get_json()

Validate Before You Trust It

A parsed body is still untrusted input. Check required keys and types yourself before saving anything to your database.

if "email" not in data:
    abort(400)

Reply With JSON Too

Pair input parsing with jsonify so your API both reads and returns clean JSON in a single tidy handler.

from flask import jsonify
return jsonify(ok=True)

A Create-User Endpoint

Together it is clean: read the JSON body, grab a field, and echo a JSON reply confirming what you received.

@app.route("/users", methods=["POST"])
def create():
    data = request.get_json()
    return jsonify(name=data["name"])

Quick Check

Confirm how Flask handles JSON payloads.

在交互式课程中回答

Recap: JSON Bodies

You parsed JSON with request.get_json, controlled force and silent, checked is_json, and validated before trusting input. 🎯

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